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Ms. Diego David
Federal Rural University of the Semi-Arid

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Research Keywords & Expertise

0 Fracture Mechanics
0 Vehicle Dynamics
0 Desalination and Water Treatments
0 Simulation (Numerical Analysis, CFD)
0 Welding numerical simulation

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Journal article
Published: 27 April 2021 in Energies
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Vegetable fibers have inspired studies in academia and industry, because of their good characteristics appropriated for many technological applications. Sisal fibers (Agave sisalana variety), when extracted from the leaf, are wet and must be dried to reduce moisture content, minimizing deterioration and degradation for long time. The control of the drying process plays an important role to guarantee maximum quality of the fibers related to mechanical strength and color. In this sense, this research aims to evaluate the drying of sisal fibers in an oven with mechanical air circulation. For this purpose, a transient and 3D mathematical model has been developed to predict moisture removal and heating of a fiber porous bed, and drying experiments were carried out at different drying conditions. The advanced model considers bed porosity, fiber and bed moisture, simultaneous heat and mass transfer, and heat transport due to conduction, convection and evaporation. Simulated drying and heating curves and the hygroscopic equilibrium moisture content of the sisal fibers are presented and compared with the experimental data, and good concordance was obtained. Results of moisture content and temperature distribution within the fiber porous bed are presented and discussed in details. It was observed that the moisture removal and temperature kinetics of the sisal fibers were affected by the temperature and relative humidity of the drying air, being more accentuated at higher temperature and lower relative humidity, and the drying process occurred in a falling rate period.

ACS Style

Jacqueline Diniz; João Delgado; Anderson Vilela; Ricardo Gomez; Arianne Viana; Maria Figueiredo; Diego Diniz; Isis Rodrigues; Fagno Rolim; Ivonete Santos; João Carmo; Antonio Lima. Drying of Sisal Fiber: A Numerical Analysis by Finite-Volumes. Energies 2021, 14, 2514 .

AMA Style

Jacqueline Diniz, João Delgado, Anderson Vilela, Ricardo Gomez, Arianne Viana, Maria Figueiredo, Diego Diniz, Isis Rodrigues, Fagno Rolim, Ivonete Santos, João Carmo, Antonio Lima. Drying of Sisal Fiber: A Numerical Analysis by Finite-Volumes. Energies. 2021; 14 (9):2514.

Chicago/Turabian Style

Jacqueline Diniz; João Delgado; Anderson Vilela; Ricardo Gomez; Arianne Viana; Maria Figueiredo; Diego Diniz; Isis Rodrigues; Fagno Rolim; Ivonete Santos; João Carmo; Antonio Lima. 2021. "Drying of Sisal Fiber: A Numerical Analysis by Finite-Volumes." Energies 14, no. 9: 2514.

Journal article
Published: 24 December 2020 in Agriculture
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This work aims to experimentally study the drying of agricultural products using microwaves, with particular reference to grains. Microwave drying experiments were carried out with paddy rice grains in natura (BRSMG Conai variety) for three levels of incident microwave power per mass of fresh grain (6.27, 14.63 and 22.99 W/g). Results of grain drying and heating kinetics are presented and analyzed. It was verified that the ideal average moisture content for grain storage and marketing, 15% (d.b.), occurred at 20 min (6.27 W/g), 13 min (14.63 W/g) and 7 min (22.99 W/g), and that the equilibrium moisture content of the samples reached 4.4%, 2.7% and 1.9%, at 310, 180 and 110 min, for each of the three power levels studied, respectively. The drying with the highest absorbed power caused discoloration of the grains at the end of the drying process.

ACS Style

Edna Silva; Ricardo Gomez; Josivanda Gomes; Wilton Silva; Ketinlly Porto; Fagno Rolim; João Carmo; Romário Andrade; Ivonete Santos; Rodrigo Sousa; Diego Diniz; Marcella Aragão; Antonio Lima. Heat and Mass Transfer on the Microwave Drying of Rough Rice Grains: An Experimental Analysis. Agriculture 2020, 11, 8 .

AMA Style

Edna Silva, Ricardo Gomez, Josivanda Gomes, Wilton Silva, Ketinlly Porto, Fagno Rolim, João Carmo, Romário Andrade, Ivonete Santos, Rodrigo Sousa, Diego Diniz, Marcella Aragão, Antonio Lima. Heat and Mass Transfer on the Microwave Drying of Rough Rice Grains: An Experimental Analysis. Agriculture. 2020; 11 (1):8.

Chicago/Turabian Style

Edna Silva; Ricardo Gomez; Josivanda Gomes; Wilton Silva; Ketinlly Porto; Fagno Rolim; João Carmo; Romário Andrade; Ivonete Santos; Rodrigo Sousa; Diego Diniz; Marcella Aragão; Antonio Lima. 2020. "Heat and Mass Transfer on the Microwave Drying of Rough Rice Grains: An Experimental Analysis." Agriculture 11, no. 1: 8.

Journal article
Published: 27 December 2018 in International Journal of Hydrogen Energy
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The possibility of the development of hydrogen embrittlement processes increases in cathodic protection systems when cathodic overprotection occurs, and large amounts of hydrogen are produced. Additionally, the hydrogen embrittlement susceptibility of steel depends on solubility, diffusivity, and hydrogen trapping. This paper presents a numerical simulation of the reversible and irreversible hydrogen trapping effects on crack propagation in API 5CT P110 steel using a model based on a synthesis of fracture mechanics and continuum damage mechanics, in which the trapping term of the diffusion equation was replaced by the trapping terms of other more complete model. The simulation was performed with using a C(T) specimen loaded in the tensile opening mode, in the linear elastic regime, in plane strain state, under the action of a static mechanical loading and the effect of hydrogen. The simulations showed that the material degradation ahead of the crack tip increases with increases in hydrogen concentration at the crack tip due to the hydrogen trapping effect. Furthermore, the process of onset and crack growth in material with irreversible traps is slower than that in material with reversible traps. These results are consistent with macroscopic observations of the trapping effect, providing a better understanding of the hydrogen embrittlement in structural steels.

ACS Style

Jorge Palma Carrasco; Diego David Silva Diniz; José Maria Andrade Barbosa; Antonio Almeida Silva; Marco Antonio dos Santos. Numerical simulation of the hydrogen trapping effect on crack propagation in API 5CT P110 steel under cathodic overprotection. International Journal of Hydrogen Energy 2018, 44, 3230 -3239.

AMA Style

Jorge Palma Carrasco, Diego David Silva Diniz, José Maria Andrade Barbosa, Antonio Almeida Silva, Marco Antonio dos Santos. Numerical simulation of the hydrogen trapping effect on crack propagation in API 5CT P110 steel under cathodic overprotection. International Journal of Hydrogen Energy. 2018; 44 (5):3230-3239.

Chicago/Turabian Style

Jorge Palma Carrasco; Diego David Silva Diniz; José Maria Andrade Barbosa; Antonio Almeida Silva; Marco Antonio dos Santos. 2018. "Numerical simulation of the hydrogen trapping effect on crack propagation in API 5CT P110 steel under cathodic overprotection." International Journal of Hydrogen Energy 44, no. 5: 3230-3239.

Journal article
Published: 25 January 2016 in Metals
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Metallic materials undergo many metallurgical changes when subjected to welding thermal cycles, and these changes have a considerable influence on the thermo-mechanical properties of welded structures. One method for evaluating the welding thermal cycle variables, while still in the project phase, would be simulation using computational methods. This paper presents an evaluation of the temperature field and residual stresses in a multipass weld of API 5L X80 steel, which is extensively used in oil and gas industry, using the Finite Element Method (FEM). In the simulation, the following complex phenomena were considered: the variation in physical and mechanical properties of the material as a function of the temperature, welding speed and convection and radiation mechanisms. Additionally, in order to characterize a multipass weld using the Gas Tungsten Arc Welding process for the root pass and the Shielded Metal Arc Welding process for the filling passes, the analytical heat source proposed by Goldak and Chakravarti was used. In addition, we were able to analyze the influence of the mesh refinement in the simulation results. The findings indicated a significant variation of about 50% in the peak temperature values. Furthermore, changes were observed in terms of the level and profile of the welded joint residual stresses when more than one welding pass was considered.

ACS Style

Jailson A. Da Nóbrega; Diego D. S. Diniz; Antônio A. Silva; Theophilo M. Maciel; Victor Hugo C. De Albuquerque; João Manuel R. S. Tavares. Numerical Evaluation of Temperature Field and Residual Stresses in an API 5L X80 Steel Welded Joint Using the Finite Element Method. Metals 2016, 6, 28 .

AMA Style

Jailson A. Da Nóbrega, Diego D. S. Diniz, Antônio A. Silva, Theophilo M. Maciel, Victor Hugo C. De Albuquerque, João Manuel R. S. Tavares. Numerical Evaluation of Temperature Field and Residual Stresses in an API 5L X80 Steel Welded Joint Using the Finite Element Method. Metals. 2016; 6 (2):28.

Chicago/Turabian Style

Jailson A. Da Nóbrega; Diego D. S. Diniz; Antônio A. Silva; Theophilo M. Maciel; Victor Hugo C. De Albuquerque; João Manuel R. S. Tavares. 2016. "Numerical Evaluation of Temperature Field and Residual Stresses in an API 5L X80 Steel Welded Joint Using the Finite Element Method." Metals 6, no. 2: 28.

Proceedings article
Published: 01 January 2016 in IX Congresso Nacional de Engenharia Mecânica
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ACS Style

Diego David Silva Diniz; Antonio Almeida Silva; Alan Gonçalves Silva; Francisco Ilson Da Silva Junior. Simulação computacional da dinâmica vertical de um veículo off road utilizando modelos multicorpos. IX Congresso Nacional de Engenharia Mecânica 2016, 1 .

AMA Style

Diego David Silva Diniz, Antonio Almeida Silva, Alan Gonçalves Silva, Francisco Ilson Da Silva Junior. Simulação computacional da dinâmica vertical de um veículo off road utilizando modelos multicorpos. IX Congresso Nacional de Engenharia Mecânica. 2016; ():1.

Chicago/Turabian Style

Diego David Silva Diniz; Antonio Almeida Silva; Alan Gonçalves Silva; Francisco Ilson Da Silva Junior. 2016. "Simulação computacional da dinâmica vertical de um veículo off road utilizando modelos multicorpos." IX Congresso Nacional de Engenharia Mecânica , no. : 1.

Journal article
Published: 01 September 2014 in The International Journal of Multiphysics
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This paper presents a numerical simulation of the reversible hydrogen trapping effect on crack propagation in the API 5CT P110 steel using a model based on a synthesis of fracture mechanics and continuum damage mechanics. The trapping term at the diffusion equation of this model was replaced by the equivalent term of McNab & Foster's model. Was simulated an C(T) specimen loaded in the mode I, in linear elastic regime, in plane strain state, and under the action of a static mechanical loading and hydrogen effect. The simulations showed that the material degradation ahead of crack tip increases with increasing in hydrogen concentration due the trapping with low interaction energies. Furthermore, the process of onset and crack growth in material with reversible traps is faster than the material free of traps. These results show a good correlation and consistency with macroscopic observations of the trapping effect, providing a better understanding of the hydrogen embrittlement in structural steels

ACS Style

Diego Diniz; Edjan Da Silva; Jorge Palma Carrasco; José Maria Barbosa; Antonio Augusto Moura Da Silva. Effect of Reversible Hydrogen Trapping on Crack Propagation in the API 5CT P110 Steel - A Numerical Simulation. The International Journal of Multiphysics 2014, 8, 313 -324.

AMA Style

Diego Diniz, Edjan Da Silva, Jorge Palma Carrasco, José Maria Barbosa, Antonio Augusto Moura Da Silva. Effect of Reversible Hydrogen Trapping on Crack Propagation in the API 5CT P110 Steel - A Numerical Simulation. The International Journal of Multiphysics. 2014; 8 (3):313-324.

Chicago/Turabian Style

Diego Diniz; Edjan Da Silva; Jorge Palma Carrasco; José Maria Barbosa; Antonio Augusto Moura Da Silva. 2014. "Effect of Reversible Hydrogen Trapping on Crack Propagation in the API 5CT P110 Steel - A Numerical Simulation." The International Journal of Multiphysics 8, no. 3: 313-324.