This page has only limited features, please log in for full access.
Efficient operation of thermal solar power plants is strongly dependent on the central receiver design. In particular, as the receiver tube determines the temperature behavior inside the receiver, its geometry proves to be the main factor affecting the solar tower receiver performances. This paper investigates the effect of several 3D geometric concepts on both temperature evolution and velocity of the working fluid at the receiver, in order to obtain an enhanced design, with augmented efficiency. A novel receiver tube with helical fins is proposed, aiming an increased heat exchange surface and improved thermal conduction. Extensive numerical simulation is carried out in ANSYS CFX (CFD) to assess the performances of the proposed solar tower receiver design. An unstructured mesh, generated by a computation machine, and (kε) turbulence model are employed to this regard. The results show that the tubes with helical fins for solar tower receivers give a very important increase in the outlet temperature, which can reach up to 1050 K.
Messaoud Hazmoune; Benaoumeur Aour; Xavier Chesneau; Mohammed Debbache; Dana-Alexandra Ciupageanu; Gheorghe Lazaroiu; Mohamed Hadjiat; Abderrahmane Hamidat. Numerical Analysis of a Solar Tower Receiver Novel Design. Sustainability 2020, 12, 6957 .
AMA StyleMessaoud Hazmoune, Benaoumeur Aour, Xavier Chesneau, Mohammed Debbache, Dana-Alexandra Ciupageanu, Gheorghe Lazaroiu, Mohamed Hadjiat, Abderrahmane Hamidat. Numerical Analysis of a Solar Tower Receiver Novel Design. Sustainability. 2020; 12 (17):6957.
Chicago/Turabian StyleMessaoud Hazmoune; Benaoumeur Aour; Xavier Chesneau; Mohammed Debbache; Dana-Alexandra Ciupageanu; Gheorghe Lazaroiu; Mohamed Hadjiat; Abderrahmane Hamidat. 2020. "Numerical Analysis of a Solar Tower Receiver Novel Design." Sustainability 12, no. 17: 6957.
Abdoulaye Compaore; Boureima Dianda; Gilbert Nana; D Bathiebo; Belkacem Zeghmati; Xavier Chesneau; Stéphane Abide. Modeling of Heat Transfer in a Habitat Built in Local Materials in Dry Tropical Climate. Physical Science International Journal 2018, 17, 1 -11.
AMA StyleAbdoulaye Compaore, Boureima Dianda, Gilbert Nana, D Bathiebo, Belkacem Zeghmati, Xavier Chesneau, Stéphane Abide. Modeling of Heat Transfer in a Habitat Built in Local Materials in Dry Tropical Climate. Physical Science International Journal. 2018; 17 (1):1-11.
Chicago/Turabian StyleAbdoulaye Compaore; Boureima Dianda; Gilbert Nana; D Bathiebo; Belkacem Zeghmati; Xavier Chesneau; Stéphane Abide. 2018. "Modeling of Heat Transfer in a Habitat Built in Local Materials in Dry Tropical Climate." Physical Science International Journal 17, no. 1: 1-11.
The internal natural convection occurs in various engineering process as evaporator, surfaces cooling.... Due to the importance of this phenomenon in various industrial sections much attention has been paid by researchers on the heat and mass transfers by natural convection in a vertical channel with plane walls. This paper deals with a numerical study of heat and mass transfers by natural convection occurring during water evaporation in a corrugated vertical channel. This channel is asymmetrically (or symmetrically) heated with a uniform heat flux density. The unsteady equations in two dimensional of Navier-Stokes, energy and species are integrated by a finite volume approach and then solved using the projections method. The aim of this work is to conduct a detailed numerical study to analyze the effects of physical parameters such as the flux density imposed at the wall and the relative humidity. The numerical results show the distributions of the axial velocity, of the temperature and of the concentration. We also represent the Nusselt and Sherwood numbers.
Mechergui Oolfa; Xavier Chesneau; Ali Hatem Laatar. Heat and mass transfer by natural convection during water evaporation in a vertical channel with protuberance. Energy Procedia 2017, 139, 791 -797.
AMA StyleMechergui Oolfa, Xavier Chesneau, Ali Hatem Laatar. Heat and mass transfer by natural convection during water evaporation in a vertical channel with protuberance. Energy Procedia. 2017; 139 ():791-797.
Chicago/Turabian StyleMechergui Oolfa; Xavier Chesneau; Ali Hatem Laatar. 2017. "Heat and mass transfer by natural convection during water evaporation in a vertical channel with protuberance." Energy Procedia 139, no. : 791-797.
The drying of sewage sludge is a current environmental problem, not sufficiently described in the literature. Hence, the aim of this work is a numerical study of heat and mass transfers during solar drying of residual sludge. This sludge is assimilated to a porous medium and exposed to a forced convection laminar flow within a horizontal channel. The transfers in the channel and the porous medium are respectively described by the classic equations of forced convection and the Darcy-Brinkman-Forchheimer model. The implicit finite difference method is used to discretize the governing differential equation system. The algebraic systems obtained are solved using the Gauss, Thomas and Gauss-Seidel algorithms. To determine the drying rate, we associate a drying kinetics model. We particularly studied the effects of solar radiation intensity on the space-time evolution of temperature, velocity and mass fraction at the porous medium-fluid interface. Moreover, the evolutions of the Nusselt numbers are represented to characterize the transfers at the sludge surface. This work is completed by a drying kinetics study. Indeed, we represent the effect of solar radiation on the space-time evolution of the drying rate.
Nidhal Ben Hassine; Xavier Chesneau; Ali Hatem Laatar. Numerical Simulation of Heat and Mass Transfers During Solar Drying of Sewage Sludge: Solar Radiation Effect. Energy Procedia 2017, 139, 804 -809.
AMA StyleNidhal Ben Hassine, Xavier Chesneau, Ali Hatem Laatar. Numerical Simulation of Heat and Mass Transfers During Solar Drying of Sewage Sludge: Solar Radiation Effect. Energy Procedia. 2017; 139 ():804-809.
Chicago/Turabian StyleNidhal Ben Hassine; Xavier Chesneau; Ali Hatem Laatar. 2017. "Numerical Simulation of Heat and Mass Transfers During Solar Drying of Sewage Sludge: Solar Radiation Effect." Energy Procedia 139, no. : 804-809.
Flow through porous media occurs in various engineering applications such as heat exchangers, cooling of gas turbine. Therefore, the heat transfer phenomenon through the porous medium is also interesting for many engineering applications. In this paper, a two-dimensional laminar flow around and through a porous square cylinder is studied numerically. The transfers in the channel and the porous medium are respectively described by the classic equations of forced convection and the Darcy-Brinkman-Forcheimer model. After the code validation, we have studied the effects of the Darcy and Reynolds numbers on several hydrodynamics parameters such as wake structure and streamlines.
Hamza Mahdhaoui; Xavier Chesneau; Ali Hatem Laatar. Numerical simulation of flow through a porous square cylinder. Energy Procedia 2017, 139, 785 -790.
AMA StyleHamza Mahdhaoui, Xavier Chesneau, Ali Hatem Laatar. Numerical simulation of flow through a porous square cylinder. Energy Procedia. 2017; 139 ():785-790.
Chicago/Turabian StyleHamza Mahdhaoui; Xavier Chesneau; Ali Hatem Laatar. 2017. "Numerical simulation of flow through a porous square cylinder." Energy Procedia 139, no. : 785-790.
Khadidja Kherbache; Xavier Chesneau; Belkacem Zeghmati; Stéphane Abide; Saâdia Benmamar. The effects of step inclination and air injection on the water flow in a stepped spillway: A numerical study. Journal of Hydrodynamics 2017, 29, 322 -331.
AMA StyleKhadidja Kherbache, Xavier Chesneau, Belkacem Zeghmati, Stéphane Abide, Saâdia Benmamar. The effects of step inclination and air injection on the water flow in a stepped spillway: A numerical study. Journal of Hydrodynamics. 2017; 29 (2):322-331.
Chicago/Turabian StyleKhadidja Kherbache; Xavier Chesneau; Belkacem Zeghmati; Stéphane Abide; Saâdia Benmamar. 2017. "The effects of step inclination and air injection on the water flow in a stepped spillway: A numerical study." Journal of Hydrodynamics 29, no. 2: 322-331.
This work concerns a dynamic modeling and a numerical simulation of the operation of an adsorption solar refrigeration system using the zeolite-water couple. For this, a mathematical model representing the evolution of heat and mass transfer at each component of the solar adsorption refrigerator has been developed. We have adopted the Dubinin-Astakhov model for the adsorption kinetics of the zeolite/water pair. This model allows to describe the phenomenon of adsorption and to calculate the rate of adsorbate (water) in the zeolite (adsorbent) as a function of the temperature and the pressure. The equations governing the operation of the solar adsorption refrigerator, deduced from the thermal and mass balances established at the collector adsorber, condenser and evaporator components, were solved by an implicit finite difference scheme and Gauss Seidel’s iterative method. We have validated the model established by applying it to the model of Allouhi et al. 2014. We analyzed the influence of the adsorbate/adsorbent couples, the solar flux, the ambient temperature on the adsorption and desorption process. The temperature profiles obtained representing the temperature evolution of the glass, the absorbent plate, the zeolite-water mixture, the condenser, the evaporator, as well as the pressure and the adsorbed mass allowed us to evaluate the performance of the solar adsorption refrigerator. SCOP is higher the higher the solar flux captured by the collector-adsorber.
Guy Christian Tubreoumya; Alfa Oumar Dissa; Eloi Salmwendé Tiendrebeogo; Xavier Chesneau; Aboubacar Compaoré; Kayaba Haro; Charles Didace Konseibo; Belkacem Zeghmati; Jean Koulidiati. Contribution to the Modeling of a Solar Adsorption Refrigerator under the Climatic Conditions of Burkina Faso. Energy and Power Engineering 2017, 09, 119 -135.
AMA StyleGuy Christian Tubreoumya, Alfa Oumar Dissa, Eloi Salmwendé Tiendrebeogo, Xavier Chesneau, Aboubacar Compaoré, Kayaba Haro, Charles Didace Konseibo, Belkacem Zeghmati, Jean Koulidiati. Contribution to the Modeling of a Solar Adsorption Refrigerator under the Climatic Conditions of Burkina Faso. Energy and Power Engineering. 2017; 09 (02):119-135.
Chicago/Turabian StyleGuy Christian Tubreoumya; Alfa Oumar Dissa; Eloi Salmwendé Tiendrebeogo; Xavier Chesneau; Aboubacar Compaoré; Kayaba Haro; Charles Didace Konseibo; Belkacem Zeghmati; Jean Koulidiati. 2017. "Contribution to the Modeling of a Solar Adsorption Refrigerator under the Climatic Conditions of Burkina Faso." Energy and Power Engineering 09, no. 02: 119-135.
This paper presents a class of fourth-order compact finite difference technique for solving two-dimensional convection diffusion equation. The equation is recasted as a first-order mixed system, introducing a conservation and flux equations. Since flux appears explicitly in the mixed formulation, we search a fourth-order compact approximation of the primary solution field and flux. Based on Taylor series expansion, the proposed compact mixed formulation generalizes the work of Carey and Spotz [G.F. Carey, W.F. Spotz, Higher-order compact mixed methods, Commun. Numer. Meth. Eng. 13 (1997)]. We show that their fourth-order formulation corresponds to a particular case of our presented scheme, and we extend their work to variable diffusion and convection coefficients. Some numerical experiments are performed to demonstrate the fourth-order effective convergence rate.
Stéphane Abide; Xavier Chesneau; Belkacem Zeghmati. Compact mixed methods for convection/diffusion type problems. Applied Mathematics and Computation 2012, 218, 5867 -5876.
AMA StyleStéphane Abide, Xavier Chesneau, Belkacem Zeghmati. Compact mixed methods for convection/diffusion type problems. Applied Mathematics and Computation. 2012; 218 (10):5867-5876.
Chicago/Turabian StyleStéphane Abide; Xavier Chesneau; Belkacem Zeghmati. 2012. "Compact mixed methods for convection/diffusion type problems." Applied Mathematics and Computation 218, no. 10: 5867-5876.
Numerical and experimental studies of the dynamics of bubbles coalescence is reported. The numerical method based on the PLIC-VOF method and our advection and surface tension algorithms has been applied to analyse the effect of surface tension and convective terms of the Navier-Stokes equations on air bubbles' coalescence in a quiescent water column. Experimental and numerical results show a mechanical attraction between both bubbles' interface before the coalescence. We analyse the effect of the type of discretization of the convective terms of the Navier-Stokes equations on the shape of bubble after the coalescence phenomenon. Numerical results are in agreement with the images of bubbles' coalescence of our experimental device recorded by a camera. Somes images show obviousness bubbles' coalescence caracterized by an intense liquid jet within the following bubble.
Jean-Michel Martinez; Xavier Chesneau; Belkacem Zeghmati. Numerical and Experimental Studies of Air Bubbles Coalescence in a Quiescent Water Column. International Journal of Chemical Reactor Engineering 2005, 3, 1 .
AMA StyleJean-Michel Martinez, Xavier Chesneau, Belkacem Zeghmati. Numerical and Experimental Studies of Air Bubbles Coalescence in a Quiescent Water Column. International Journal of Chemical Reactor Engineering. 2005; 3 (1):1.
Chicago/Turabian StyleJean-Michel Martinez; Xavier Chesneau; Belkacem Zeghmati. 2005. "Numerical and Experimental Studies of Air Bubbles Coalescence in a Quiescent Water Column." International Journal of Chemical Reactor Engineering 3, no. 1: 1.