Publication de 18 numéros par an
ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561
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THREE-DIMENSIONAL NATURAL CONVECTION AND ENTROPY GENERATION IN TALL RECTANGULAR ENCLOSURES FILLED WITH STRATIFIED NANOFLUID/AIR FLUIDS
RÉSUMÉ
Fluid flow, heat transfer, and volumetric entropy generation due to the three-dimensional natural convection within a tall rectangular enclosure filled with two immiscible/stratified fluids have been studied comprehensively as a simplified thermal model for each cell of lead–acid batteries. The stratified fluids consist of an MWCNT–SiO2 (15%–85%)/EG nanofluid at the bottom and air in the top region of the enclosure. The Navier–Stokes equations are solved based on a three-dimensional form, and finite volume approach is utilized. The boundary condition for the interface involve heat and mass transfer and shear stress. The heated side walls have a constant heat flux, the bottom and top parts of the side walls have a symmetry condition showing the existence of similar fluid flow in the neighbor cell. The top and bottom walls are cooled by environment temperature. The three-dimensional flow structure and temperature field are obtained and analyzed at mid-depth in a two-dimensional form. Different operating parameters such as the aspect ratio (12 < AR < 120), Rayleigh number (103 < Ra < 106), and the solid volume fraction (φ = 0.005–0.02) are considered with fluid flow, heat transfer, and volumetric entropy generation. The results show that the dominant heat transfer mechanism is conduction at the tall enclosures with a high aspect ratio. Moreover, the interface between the nanofluid and air phases is acting like an insulation medium banning the heat energy to escape from the nanofluid region to the top cold wall. The Nusselt number enhances with increasing Rayleigh number and solid volume fraction. Higher volumetric entropy generation occurs at higher Rayleigh number and lower aspect ratio and solid volume fraction.
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Zhang Rui, Ghasemi Ali, Barzinjy Azeez A., Zareei Maliheh, Hamad Samir M., Afrand Masoud, Simulating natural convection and entropy generation of a nanofluid in an inclined enclosure under an angled magnetic field with a circular fin and radiation effect, Journal of Thermal Analysis and Calorimetry, 139, 6, 2020. Crossref
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Pu Qiang, Aalizadeh Farhad, Aghamolaei Darya, Masoumnezhad Mojtaba, Rahimi Alireza, Kasaeipoor Abbas, Lattice Boltzmann simulation of convective flow and heat transfer in a nanofluid-filled hollow cavity, International Journal of Numerical Methods for Heat & Fluid Flow, 29, 9, 2019. Crossref