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Abhishek Ratanpara; Alexander Shaw; Sanat Deshpande; Myeongsub Kim. Utilization of Ocean Water for Catalytic Carbon Capture With Nickel Nanoparticles. 2021, 1 .
AMA StyleAbhishek Ratanpara, Alexander Shaw, Sanat Deshpande, Myeongsub Kim. Utilization of Ocean Water for Catalytic Carbon Capture With Nickel Nanoparticles. . 2021; ():1.
Chicago/Turabian StyleAbhishek Ratanpara; Alexander Shaw; Sanat Deshpande; Myeongsub Kim. 2021. "Utilization of Ocean Water for Catalytic Carbon Capture With Nickel Nanoparticles." , no. : 1.
Mahyar Ghazivini; Mazen Hafez; Abhishek Ratanpara; Myeongsub Kim. A review on correlations of bubble growth mechanisms and bubble dynamics parameters in nucleate boiling. Journal of Thermal Analysis and Calorimetry 2021, 1 .
AMA StyleMahyar Ghazivini, Mazen Hafez, Abhishek Ratanpara, Myeongsub Kim. A review on correlations of bubble growth mechanisms and bubble dynamics parameters in nucleate boiling. Journal of Thermal Analysis and Calorimetry. 2021; ():1.
Chicago/Turabian StyleMahyar Ghazivini; Mazen Hafez; Abhishek Ratanpara; Myeongsub Kim. 2021. "A review on correlations of bubble growth mechanisms and bubble dynamics parameters in nucleate boiling." Journal of Thermal Analysis and Calorimetry , no. : 1.
The present study utilizes a microfluidic approach to investigate the effect of monoethanolamine (MEA) on increasing CO2 solubility in a light crude oil for low pressure immiscible enhanced oil recovery (EOR) operations. The CO2 microbubble area reduction over time was measured at varying MEA concentrations in oil to quantitatively estimate the effect of MEA on CO2 solubility, and as a result, its effect on gas-induced oil swelling and oil viscosity reduction. The maximum CO2 dissolution in 0.1% (v/v) MEA and 2% (v/v) MEA in oil was observed to be 77% and 86% dissolution, respectively. In addition, minor increases in CO2 dissolution rate were observed in 2% (v/v) MEA with oil when compared with 1% (v/v) MEA with oil and the control (pure oil). Furthermore, in order to test the feasibility of MEA employment in actual EOR operations, a series of immiscible CO2 flooding experiments were performed in a porous media to simulate an actual oil reservoir. In CO2 flooding experiments, the cumulative oil recovery efficiency was increased by 4% and 22% with 5% (v/v) MEA and 10% (v/v) MEA, respectively, due to the reduction of oil viscosity by CO2 dissolution. Unique phenomena such as trapping, displacement, re-filling, and drifting of oil blobs were observed during CO2 flooding. The MEA's strong effect on CO2 solubility, and as a result, its effect on various oil properties, indicates a potential for improving the recovery factor and reducing the cost of EOR operations.
Mazen Hafez; Abhishek P. Ratanpara; Yoan Martiniere; Maxime Dagois; Mahyar Ghazvini; MohammadHassan Kavosi; Philippe Mandin; Myeongsub Kim. CO2-monoethanolamine-induced oil swelling and viscosity reduction for enhanced oil recovery. Journal of Petroleum Science and Engineering 2021, 206, 109022 .
AMA StyleMazen Hafez, Abhishek P. Ratanpara, Yoan Martiniere, Maxime Dagois, Mahyar Ghazvini, MohammadHassan Kavosi, Philippe Mandin, Myeongsub Kim. CO2-monoethanolamine-induced oil swelling and viscosity reduction for enhanced oil recovery. Journal of Petroleum Science and Engineering. 2021; 206 ():109022.
Chicago/Turabian StyleMazen Hafez; Abhishek P. Ratanpara; Yoan Martiniere; Maxime Dagois; Mahyar Ghazvini; MohammadHassan Kavosi; Philippe Mandin; Myeongsub Kim. 2021. "CO2-monoethanolamine-induced oil swelling and viscosity reduction for enhanced oil recovery." Journal of Petroleum Science and Engineering 206, no. : 109022.
Hydrogen is an excellent energy source for long-term storage and free of greenhouse gases. However, its high production cost remains an obstacle to its advancement. The two main parameters contributing to the high cost include the cost of electricity and the cost of initial financial investment. It is possible to reduce the latter by the optimization of system design and operation conditions, allowing the reduction of the cell voltage. Because the CAPEX (initial cost divided by total hydrogen production of the electrolyzer) decreases according to current density but the OPEX (operating cost depending on the cell voltage) increases depending on the current density, there exists an optimal current density. In this paper, a genetic algorithm has been developed to find the optimal evolution parameters and to determine an optimum electrolyzer design. The optimal current density has been increased by 10% and the hydrogen cost has been decreased by 1%.
Damien Le Bideau; Olivier Chocron; Philippe Mandin; Patrice Kiener; Mohamed Benbouzid; Mathieu Sellier; Myeongsub Kim; Fabrizio Ganci; Rosalinda Inguanta. Evolutionary Design Optimization of an Alkaline Water Electrolysis Cell for Hydrogen Production. Applied Sciences 2020, 10, 8425 .
AMA StyleDamien Le Bideau, Olivier Chocron, Philippe Mandin, Patrice Kiener, Mohamed Benbouzid, Mathieu Sellier, Myeongsub Kim, Fabrizio Ganci, Rosalinda Inguanta. Evolutionary Design Optimization of an Alkaline Water Electrolysis Cell for Hydrogen Production. Applied Sciences. 2020; 10 (23):8425.
Chicago/Turabian StyleDamien Le Bideau; Olivier Chocron; Philippe Mandin; Patrice Kiener; Mohamed Benbouzid; Mathieu Sellier; Myeongsub Kim; Fabrizio Ganci; Rosalinda Inguanta. 2020. "Evolutionary Design Optimization of an Alkaline Water Electrolysis Cell for Hydrogen Production." Applied Sciences 10, no. 23: 8425.
Hydrogen storage is a promising technology for storage of renewable energy resources. Despite its high energy density potential, the development of hydrogen storage has been impeded, mainly due to its significant cost. Although its cost is governed mainly by electrical energy expense, especially for hydrogen produced with alkaline water electrolysis, it is also driven by the value of the cell tension. The most common means of electrolyzer improvement is the use of an electrocatalyst, which reduces the energy required for electrochemical reaction to take place. Another efficient means of electrolyzer improvement is to use the Computational Fluid Dynamics (CFD)-assisted design that allows the comprehension of the phenomena occurring in the electrolyzer and also the improvement in the electrolyzer’s efficiency. The designed two-phase hydrodynamics model of this study has been compared with the experimental results of velocity profiles measured using Laser Doppler Velocimetry (LDV) method. The simulated results were in good agreement with the experimental data in the literature. Under the good fit with experimental values, it is efficient to introduce a new physical bubble transfer phenomenon description called “bubble diffusion”.
Damien Le Bideau; Philippe Mandin; Mohamed Benbouzid; Myeongsub Kim; Mathieu Sellier; Fabrizio Ganci; Rosalinda Inguanta. Eulerian Two-Fluid Model of Alkaline Water Electrolysis for Hydrogen Production. Energies 2020, 13, 3394 .
AMA StyleDamien Le Bideau, Philippe Mandin, Mohamed Benbouzid, Myeongsub Kim, Mathieu Sellier, Fabrizio Ganci, Rosalinda Inguanta. Eulerian Two-Fluid Model of Alkaline Water Electrolysis for Hydrogen Production. Energies. 2020; 13 (13):3394.
Chicago/Turabian StyleDamien Le Bideau; Philippe Mandin; Mohamed Benbouzid; Myeongsub Kim; Mathieu Sellier; Fabrizio Ganci; Rosalinda Inguanta. 2020. "Eulerian Two-Fluid Model of Alkaline Water Electrolysis for Hydrogen Production." Energies 13, no. 13: 3394.
In industrial post-carbon capture processes, monoethanolamine (MEA) has been mainly used as an absorption solvent. However, this approach generates significant amounts of toxic wastewater containing a heavy chemical difficult to treat and also raises concerns about acute corrosion of metal structures in the facility. To reduce the use of MEA in carbon capture, this work evaluates the catalytic performance of nickel nanoparticles (NiNPs) for CO2 capture as a possible additive in an MEA solvent. We test the CO2 absorption rate in MEA catalyzed by NiNPs in both limited and high mixing conditions to model real capturing processes in the packed column of industrial absorption reactors. For this purpose, a microreactor and a long serpentine microchannel are employed. The catalytic absorption performance of NiNPs for CO2 in aqueous MEA is evaluated using CO2 microbubbles by monitoring changes in size upon their time-dependent absorption. We find that the average CO2 absorption rate with NiNPs is accelerated by 34% in the limited mixing condition in the microreactor. This increase is mainly due to NPs’ catalytic CO2 absorption driven by a Brownian motion. On the other hand, in the high mixing condition in the long serpentine microchannel, the catalytic activity of NiNPs improves the average CO2 absorption rate further to 54%. This improvement makes it possible to shorten the timescale for reaching CO2 absorption equilibrium and therefore to reduce the size of the reactors significantly. The test results demonstrate that NiNPs serve as suitable additives in the MEA-based CO2 absorption system.
Seokju Seo; Brian Lages; Myeongsub Kim. Catalytic CO2 absorption in an amine solvent using nickel nanoparticles for post-combustion carbon capture. Journal of CO2 Utilization 2019, 36, 244 -252.
AMA StyleSeokju Seo, Brian Lages, Myeongsub Kim. Catalytic CO2 absorption in an amine solvent using nickel nanoparticles for post-combustion carbon capture. Journal of CO2 Utilization. 2019; 36 ():244-252.
Chicago/Turabian StyleSeokju Seo; Brian Lages; Myeongsub Kim. 2019. "Catalytic CO2 absorption in an amine solvent using nickel nanoparticles for post-combustion carbon capture." Journal of CO2 Utilization 36, no. : 244-252.
Biosample encapsulation is a critical step in a wide range of biomedical and bioengineering applications. Aqueous two-phase system (ATPS) droplets have been recently introduced and showed a great promise to the biological separation and encapsulation due to their excellent biocompatibility. This study shows for the first time the passive generation of salt-based ATPS microdroplets and their biocompatibility test. We used two ATPS including polymer/polymer (polyethylene glycol (PEG)/dextran (DEX)) and polymer/salt (PEG/Magnesium sulfate) for droplet generation in a flow-focusing geometry. Droplet morphologies and monodispersity in both systems are studied. The PEG/salt system showed an excellent capability of uniform droplet formation with a wide range of sizes (20–60 μm) which makes it a suitable candidate for encapsulation of biological samples. Therefore, we examined the potential application of the PEG/salt system for encapsulating human umbilical vein endothelial cells (HUVECs). A cell viability test was conducted on MgSO4 solutions at various concentrations and our results showed an adequate cell survival. The findings of this research suggest that the polymer/salt ATPS could be a biocompatible all-aqueous platform for cell encapsulation.
Mohammad Mastiani; Negar Firoozi; Nicholas Petrozzi; Seokju Seo; Myeongsub Kim. Polymer-Salt Aqueous Two-Phase System (ATPS) Micro-Droplets for Cell Encapsulation. Scientific Reports 2019, 9, 1 -9.
AMA StyleMohammad Mastiani, Negar Firoozi, Nicholas Petrozzi, Seokju Seo, Myeongsub Kim. Polymer-Salt Aqueous Two-Phase System (ATPS) Micro-Droplets for Cell Encapsulation. Scientific Reports. 2019; 9 (1):1-9.
Chicago/Turabian StyleMohammad Mastiani; Negar Firoozi; Nicholas Petrozzi; Seokju Seo; Myeongsub Kim. 2019. "Polymer-Salt Aqueous Two-Phase System (ATPS) Micro-Droplets for Cell Encapsulation." Scientific Reports 9, no. 1: 1-9.
A numerical study of aqueous droplet generation in a high Reynolds (Re) number air flow was performed in a microfluidic flow-focusing geometry. Droplet breakup mechanisms, flow regime mapping, droplet morphology, and droplet generation frequency were studied in a high initial air flow under various flow conditions. Several flow regimes were identified including dripping, unstable dripping, plugging, stratified flow, multi-satellite droplet formation, and unstable jetting. Unstable dripping, multi-satellite droplet formation, and unstable jetting have been observed as new flow regimes in our study. We found that the high inertial air flow remarkably induces the formation of these new flow regimes by retaining unique droplet generation mechanisms and morphology. In particular, the polydisperse spray of tiny droplets is formed at the junction in the multi-satellite droplet formation regime, while at the end of a jet in the unstable jetting regime. On the other hand, stable droplet generation occurs in the dripping and plugging regimes, while generated droplets in the unstable dripping, unstable jetting, and multi-satellite droplet formation regimes are unstable. The maximum generation frequency of ~ 1900 Hz was obtained under the unstable dripping regime. It was found that increasing Re number results in droplet size reduction, while higher capillary (Ca) number leads to bigger droplets.
Mohammad Mastiani; Seokju Seo; Benjamin Riou; Myeongsub Kim. High inertial microfluidics for droplet generation in a flow-focusing geometry. Biomedical Microdevices 2019, 21, 50 .
AMA StyleMohammad Mastiani, Seokju Seo, Benjamin Riou, Myeongsub Kim. High inertial microfluidics for droplet generation in a flow-focusing geometry. Biomedical Microdevices. 2019; 21 (3):50.
Chicago/Turabian StyleMohammad Mastiani; Seokju Seo; Benjamin Riou; Myeongsub Kim. 2019. "High inertial microfluidics for droplet generation in a flow-focusing geometry." Biomedical Microdevices 21, no. 3: 50.
Carbon sequestration into deep saline aquifers has been considered a promising technology for mitigating heavy atmospheric carbon dioxide (CO2) concentration. When gaseous CO2 is continuously injected into these aquifers, resident brine near a wellbore area is rapidly evaporated while precipitating significant amounts of salt at pores, thereby damaging the aquifer media unfavorable for subsequent CO2 injection. In addition, the continuous injection of CO2 at a large volume significantly hinders dissolution of CO2 into brine. In this study, we propose a new method of sequential water injection with gaseous CO2 for in-situ generation of micro-sized CO2 bubbles that minimizes the brine drying-out and simultaneously accelerates CO2 dissolution. We observed that, with this method, a partial volume of CO2 dissolves effectively into the co-injected water during pumping, thereby decreasing the rate of brine drying-out at pores. Another benefit of sequential injection is the significantly increased rate of CO2 hydration induced by the large surface-to-volume ratio of tiny bubbles at micro to nanoscale. To further accelerate CO2 hydration, we investigated reactive dynamics of bubble-driven CO2 hydration at different frequencies of sequential injection and pH levels of the solution. Operation at a higher frequency with higher basicity proved to be the most effective in decreasing the bubble size and therefore accelerating CO2 hydration into brine, which is a more feasible CO2 storage plan.
Seokju Seo; Mohammad Mastiani; Mazen Hafez; Genevieve Kunkel; Christian Ghattas Asfour; Kevin Ivan Garcia-Ocampo; Natalia Linares; Cesar Saldana; Kwangsoo Yang; Myeongsub Kim. Injection of in-situ generated CO2 microbubbles into deep saline aquifers for enhanced carbon sequestration. International Journal of Greenhouse Gas Control 2019, 83, 256 -264.
AMA StyleSeokju Seo, Mohammad Mastiani, Mazen Hafez, Genevieve Kunkel, Christian Ghattas Asfour, Kevin Ivan Garcia-Ocampo, Natalia Linares, Cesar Saldana, Kwangsoo Yang, Myeongsub Kim. Injection of in-situ generated CO2 microbubbles into deep saline aquifers for enhanced carbon sequestration. International Journal of Greenhouse Gas Control. 2019; 83 ():256-264.
Chicago/Turabian StyleSeokju Seo; Mohammad Mastiani; Mazen Hafez; Genevieve Kunkel; Christian Ghattas Asfour; Kevin Ivan Garcia-Ocampo; Natalia Linares; Cesar Saldana; Kwangsoo Yang; Myeongsub Kim. 2019. "Injection of in-situ generated CO2 microbubbles into deep saline aquifers for enhanced carbon sequestration." International Journal of Greenhouse Gas Control 83, no. : 256-264.
This article presents an exhaustive review of the transport properties necessary for the multiphysics modelling of alkaline water electrolyzer. This article provides experimental data and the correlations needed to calculate thermos-physical properties such as electrical conductivity, density, viscosity, heat capacity, heat and mass transfer diffusion coefficients as a function of temperature and electrolyte mass fraction for two classical alkaline electrolytes (KOH, NaOH). Thus, the different boundary layers growing on the electrodes can be calculated with precision. Different interpolation models from various authors are compared to raw experimental data. The goal of this article is to give to the modeler the correlations needed for the simulation of alkaline water electrolysis.
Damien Le Bideau; Philippe Mandin; Mohamed Benbouzid; Myeongsub Kim; Mathieu Sellier. Review of necessary thermophysical properties and their sensivities with temperature and electrolyte mass fractions for alkaline water electrolysis multiphysics modelling. International Journal of Hydrogen Energy 2019, 44, 4553 -4569.
AMA StyleDamien Le Bideau, Philippe Mandin, Mohamed Benbouzid, Myeongsub Kim, Mathieu Sellier. Review of necessary thermophysical properties and their sensivities with temperature and electrolyte mass fractions for alkaline water electrolysis multiphysics modelling. International Journal of Hydrogen Energy. 2019; 44 (10):4553-4569.
Chicago/Turabian StyleDamien Le Bideau; Philippe Mandin; Mohamed Benbouzid; Myeongsub Kim; Mathieu Sellier. 2019. "Review of necessary thermophysical properties and their sensivities with temperature and electrolyte mass fractions for alkaline water electrolysis multiphysics modelling." International Journal of Hydrogen Energy 44, no. 10: 4553-4569.
Aqueous two-phase system (ATPS) droplet generation has significant potential in biological and medical applications because of its excellent biocompatibility. However, the ultralow interfacial tension of ATPS makes droplet generation extremely challenging when compared with the conventional water-in-oil (W/O) system. In this paper, we passively produced ATPS droplets with a wide range of droplet size and high production rate without the involvement of an oil phase and external forces. For the first time, we reported important information of the flow rate and capillary (Ca) number for passive, oil-free ATPS droplet generation. It was found that the range of Ca numbers of the continuous phase under the jetting flow regime is 0.3–1.7, as compared to less than 0.1 in the W/O system, indicating the ultralow interfacial tension in ATPS. In addition, we successfully generated ATPS droplets with a radius as small as 7 μm at the maximum frequency up to 300 Hz, which has not been achieved in previous studies. The size and generation frequency of ATPS droplets can be controlled independently by adjusting the inlet pressures and corresponding flow rates. We found that the droplet size is correlated with the pressure and flow rate ratios with the power-law exponents of 0.8 and 0.2, respectively.
Mohammad Mastiani; Seokju Seo; Babak Mosavati; Myeongsub Kim. High-Throughput Aqueous Two-Phase System Droplet Generation by Oil-Free Passive Microfluidics. ACS Omega 2018, 3, 9296 -9302.
AMA StyleMohammad Mastiani, Seokju Seo, Babak Mosavati, Myeongsub Kim. High-Throughput Aqueous Two-Phase System Droplet Generation by Oil-Free Passive Microfluidics. ACS Omega. 2018; 3 (8):9296-9302.
Chicago/Turabian StyleMohammad Mastiani; Seokju Seo; Babak Mosavati; Myeongsub Kim. 2018. "High-Throughput Aqueous Two-Phase System Droplet Generation by Oil-Free Passive Microfluidics." ACS Omega 3, no. 8: 9296-9302.
This work shows the potential of nickel (Ni) nanoparticles (NPs) stabilized by polymers for accelerating carbon dioxide (CO2) dissolution into saline aquifers. The catalytic characteristics of Ni NPs were investigated by monitoring changes in diameter of CO2 microbubbles. An increase in ionic strength considerably reduces an electrostatic repulsive force in pristine Ni NPs, thereby decreasing their catalytic potential. This study shows how cationic dextran (DEX), nonionic poly(vinyl pyrrolidone) (PVP), and anionic carboxy methylcellulose (CMC) polymers, the dispersive behaviors of Ni NPs can be used to overcome the negative impact of salinity on CO2 dissolution. The cationic polymer, DEX was less adsorbed onto NPs surfaces, thereby limiting the Ni NPs’ catalytic activity. This behavior is due to a competition for Ni NPs’ surface sites between the cation and DEX under high salinity. On the other hand, the non/anionic polymers, PVP and CMC could be relatively easily adsorbed onto anchoring sites of Ni NPs by the monovalent cation, Na+. Considerable dispersion of Ni NPs by an optimal concentration of the anionic polymers improved their catalytic capabilities even under unfavorable conditions for CO2 dissolution. This study has implications for enhancing geologic sequestration into deep saline aquifers for the purposes of mitigating atmospheric CO2 levels.
Seokju Seo; Gabriela Alvarez Perez; Ketan Tewari; Xavier Comas; Myeongsub Kim. Catalytic activity of nickel nanoparticles stabilized by adsorbing polymers for enhanced carbon sequestration. Scientific Reports 2018, 8, 1 -11.
AMA StyleSeokju Seo, Gabriela Alvarez Perez, Ketan Tewari, Xavier Comas, Myeongsub Kim. Catalytic activity of nickel nanoparticles stabilized by adsorbing polymers for enhanced carbon sequestration. Scientific Reports. 2018; 8 (1):1-11.
Chicago/Turabian StyleSeokju Seo; Gabriela Alvarez Perez; Ketan Tewari; Xavier Comas; Myeongsub Kim. 2018. "Catalytic activity of nickel nanoparticles stabilized by adsorbing polymers for enhanced carbon sequestration." Scientific Reports 8, no. 1: 1-11.
Chemical enhanced oil recovery (EOR) is a successful method for increasing crude oil recovery. However, chemicals commonly used for enhanced oil recovery operations possess adverse biological impacts. To meet the legislative requirement and environmental protection demands, the performance of a highly biodegradable nonionic surfactant derived from tannic acid, a possible alternative, was evaluated using a microfluidic technology for the replacement of chemically synthesis surfactant by green chemistry products. Aqueous microdroplets containing the surfactant in crude oils were used for measurements of interfacial tension (IFT) reduction. The degree of interfacial tension reduction by sodium dodecyl sulfate (SDS), one of the most popular conventional surfactants, was also quantified for performance comparison. The potential of the biosurfactant for IFT reduction of light crude oil was superior to that of SDS. To evaluate the feasibility of the biosurfactant in improvement of recovery efficiency, surfactant-assisted flooding was tested under a random microfluidic network at the optimal concentrations, and the results were in good agreement with IFT reduction tests. The utilization of the polymer in a biosurfactant synthesis process effectively enhanced high sweep efficiency by decreasing a viscous fingering effect. The biosurfactant proved to be adequate and can sufficiently alleviate environmental concerns adopted by chemical flooding EOR.
Seokju Seo; Mohammad Mastiani; Babak Mosavati; Derek Michael Peters; Philippe Mandin; Myeongsub Kim. Performance evaluation of environmentally benign nonionic biosurfactant for enhanced oil recovery. Fuel 2018, 234, 48 -55.
AMA StyleSeokju Seo, Mohammad Mastiani, Babak Mosavati, Derek Michael Peters, Philippe Mandin, Myeongsub Kim. Performance evaluation of environmentally benign nonionic biosurfactant for enhanced oil recovery. Fuel. 2018; 234 ():48-55.
Chicago/Turabian StyleSeokju Seo; Mohammad Mastiani; Babak Mosavati; Derek Michael Peters; Philippe Mandin; Myeongsub Kim. 2018. "Performance evaluation of environmentally benign nonionic biosurfactant for enhanced oil recovery." Fuel 234, no. : 48-55.
Recent advent of Aqueous-Two-Phase-System (ATPS), more biologically friendly compared to conventional oil-water systems, has shown great potential to rapidly generate aqueous droplets without tedious post-processing. However, understanding of underlying physics of droplet formation in ATPS is still in its infancy. In this paper, we investigate hydrodynamic behaviors and mechanisms of all-aqueous droplet formation in two flow-focusing droplet generators. Two incompatible polymers namely polyethylene glycol (PEG) and dextran (DEX) are mixed in water to make ATPS. The influence of inlet pressures and flow-focusing configurations on droplet sizes, and thread breakup length is studied. Flow regime mapping for two different configurations of droplet generators possessing junction angles of 30° and 90° is also obtained. The results show that droplet size is very susceptible to the junction angle while inlet pressures of the PEG and DEX flows readily control four main flow regimes including back flow, dripping, jetting and stratified.
Mohammad Mastiani; Seokju Seo; Sofia Melgar Jimenez; Nick Petrozzi; Myeongsub (Mike) Kim. Understanding Fundamental Physics of Aqueous Droplet Generation Mechanisms in the Aqueous Environment. Volume 4A: Dynamics, Vibration, and Control 2017, 1 .
AMA StyleMohammad Mastiani, Seokju Seo, Sofia Melgar Jimenez, Nick Petrozzi, Myeongsub (Mike) Kim. Understanding Fundamental Physics of Aqueous Droplet Generation Mechanisms in the Aqueous Environment. Volume 4A: Dynamics, Vibration, and Control. 2017; ():1.
Chicago/Turabian StyleMohammad Mastiani; Seokju Seo; Sofia Melgar Jimenez; Nick Petrozzi; Myeongsub (Mike) Kim. 2017. "Understanding Fundamental Physics of Aqueous Droplet Generation Mechanisms in the Aqueous Environment." Volume 4A: Dynamics, Vibration, and Control , no. : 1.
Two new flow regimes named unstable dripping and unstable jetting are identified in aqueous droplet generation within high inertial air flow inside a T-Junction microchannel. Aqueous microdroplet generation involving high inertial air flow inside a T-junction microchannel was studied numerically. The volume of fluid method was employed to track the interface between two immiscible fluids: water and air. The effects of high inertial air flow on the water droplet generation were investigated. At various Re and Ca numbers, unique flow regime mapping including squeezing, dripping, jetting, unstable dripping, and unstable jetting and their transitions were determined. Unstable dripping and unstable jetting flow regimes are new regimes which have not been previously reported in the liquid–liquid system. The flow structure in these two flow regimes is affected by the high inertial nature of the continuous phase which is negligible in the conventional liquid–liquid system. It was found that the stable aqueous droplets are generated in the squeezing and dripping flow regimes. On the other hand, the unstable dripping flow regime is unable to sustain spherical droplets as they travel downstream. In the unstable jetting flow regime, a stream of water is fragmented into multi-satellite droplets and threads of different sizes as it moves downstream. The behavior of the unstable jetting flow regime cannot be characterized due to the effect of high inertial air flow on the water stream. The results show that droplet size increases as Ca and Re numbers increase and decrease, respectively. As both Ca and Re numbers increase, droplet generation frequency increases, reaching its maximum at 223 Hz. Finally, the effect of different contact angles at 120–180° on droplet size, detachment time, and droplet generation frequency was investigated. The results of this research provide valuable insight into the understanding of high throughput oil-free aqueous droplet generation within a gas flow.
Mohammad Mastiani; Babak Mosavati; Myeongsub (Mike) Kim. Numerical simulation of high inertial liquid-in-gas droplet in a T-junction microchannel. RSC Advances 2017, 7, 48512 -48525.
AMA StyleMohammad Mastiani, Babak Mosavati, Myeongsub (Mike) Kim. Numerical simulation of high inertial liquid-in-gas droplet in a T-junction microchannel. RSC Advances. 2017; 7 (77):48512-48525.
Chicago/Turabian StyleMohammad Mastiani; Babak Mosavati; Myeongsub (Mike) Kim. 2017. "Numerical simulation of high inertial liquid-in-gas droplet in a T-junction microchannel." RSC Advances 7, no. 77: 48512-48525.
This work reports a microfluidic study investigating the feasibility of accelerating gaseous carbon dioxide (CO2) dissolution into a continuous aqueous phase with the use of metallic nickel (Ni) nanoparticles (NPs) under conditions specific to carbon sequestration in saline aquifers. The dissolution of CO2 bubbles at different pH levels and salinities was studied to understand the effects that the intrinsic characteristics of brine in real reservoir conditions would have on CO2 solubility. Results showed that an increased shrinkage of CO2 bubbles occurred with higher basicity, while an increased expansion of CO2 bubbles was observed with a proportional increase in salinity. To achieve acceleration of CO2 dissolution in acidic brine containing high salinity content, the catalytic effect of Ni NPs was investigated by monitoring change in CO2 bubble size at various Ni NPs concentrations. The optimal concentration for the Ni NPs suspension was determined to be 30 mg L–1; increasing the concentration up to 30 mg L–1 showed a significant increase in the dissolution of CO2 bubbles, but increasing from 30 to 50 mg L–1 displayed a decrease in catalytic potential, due to the decreased translational diffusion coefficient that occurs at higher concentrations. The optimal additive concentration of Ni NPs was tested with variations of solution at acidic and basic conditions and different levels of salinity to reveal how effectively the Ni NPs behave under real reservoir conditions. At the acidic level, Ni NPs proved to be more effective in catalyzing CO2 dissolution and can sufficiently alleviate the negative impact of salinity in brine.
Seokju Seo; Minh Nguyen; Mohammad Mastiani; Gabriel Navarrete; Myeongsub Kim. Microbubbles Loaded with Nickel Nanoparticles: A Perspective for Carbon Sequestration. Analytical Chemistry 2017, 89, 10827 -10833.
AMA StyleSeokju Seo, Minh Nguyen, Mohammad Mastiani, Gabriel Navarrete, Myeongsub Kim. Microbubbles Loaded with Nickel Nanoparticles: A Perspective for Carbon Sequestration. Analytical Chemistry. 2017; 89 (20):10827-10833.
Chicago/Turabian StyleSeokju Seo; Minh Nguyen; Mohammad Mastiani; Gabriel Navarrete; Myeongsub Kim. 2017. "Microbubbles Loaded with Nickel Nanoparticles: A Perspective for Carbon Sequestration." Analytical Chemistry 89, no. 20: 10827-10833.
Mohammad Mastiani; Myeongsub Mike Kim; Ali Nematollahi. Density maximum effects on mixed convection in a square lid-driven enclosure filled with Cu-water nanofluids. Advanced Powder Technology 2017, 28, 197 -214.
AMA StyleMohammad Mastiani, Myeongsub Mike Kim, Ali Nematollahi. Density maximum effects on mixed convection in a square lid-driven enclosure filled with Cu-water nanofluids. Advanced Powder Technology. 2017; 28 (1):197-214.
Chicago/Turabian StyleMohammad Mastiani; Myeongsub Mike Kim; Ali Nematollahi. 2017. "Density maximum effects on mixed convection in a square lid-driven enclosure filled with Cu-water nanofluids." Advanced Powder Technology 28, no. 1: 197-214.
Recent advancements in microelectromechanical systems (MEMS) have required state-of-the-art techniques that provide accurate information of physical parameters such as fluid velocities and temperatures, at small scales, to fully characterize fluid flows in these devices. Especially it is difficult to measure temperature fields at microscale using conventional methods due to the limitation of spatial resolution in these techniques. In this paper, we present a comprehensive review of various advanced microscale thermometry techniques for measurements of bulk fluid or wall surface temperature fields. Differing from earlier publications, this review particularly focuses on categorizing the thermometry techniques based on how they measure temperature information at the microscale, i.e., either contact or noncontact methods. The paper presents details of measurement principles for each thermometry technique and includes a broad range of their applications. For the contact-based thermometry, the most recent fabrication and measurement results with micro-thermocouples are introduced, followed by discussions for scanning temperature probes and atomic force microscope (AFM) temperature probes. On the other hand, noncontact-based thermometry techniques are broadly summarized, including optical thermometry, liquid crystal thermometry, infrared thermometry, and Raman spectroscopy. Strengths and weaknesses of each technique compared to other approaches, with information of spatial, temporal, and temperature resolutions are introduced and discussed. This review will provide a general guideline for readers regarding the advantages and disadvantages of the most recent microscale thermometry techniques considering key requirements such as tool availability, system limitations, and temperature resolution.
Myeongsub Mike Kim; Alexandre Giry; Mohammad Mastiani; Gustavo O. Rodrigues; Alessandro Reis; Philippe Mandin. Microscale thermometry: A review. Microelectronic Engineering 2015, 148, 129 -142.
AMA StyleMyeongsub Mike Kim, Alexandre Giry, Mohammad Mastiani, Gustavo O. Rodrigues, Alessandro Reis, Philippe Mandin. Microscale thermometry: A review. Microelectronic Engineering. 2015; 148 ():129-142.
Chicago/Turabian StyleMyeongsub Mike Kim; Alexandre Giry; Mohammad Mastiani; Gustavo O. Rodrigues; Alessandro Reis; Philippe Mandin. 2015. "Microscale thermometry: A review." Microelectronic Engineering 148, no. : 129-142.