Numerical investigation of combined buoyancy-thermocapillary convection and entropy generation in 3D cavity filled with Al2O3 nanofluid

Heat transfer, fluid flow and entropy generation due to combined buoyancy and thermocapillary forces in a 3D differentially heated enclosure containing Al2O3 nanofluid are carried out for different Marangoni numbers and different nanoparticles concentrations. The vector potential-vorticity formalism...

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Bibliographic Details
Published inAlexandria engineering journal Vol. 56; no. 1; pp. 71 - 79
Main Authors Kolsi, Lioua, Lajnef, Emtinene, Aich, Walid, Alghamdi, Abdulaziz, Ahmed Aichouni, Mohamed, Borjini, Mohamed Naceur, Ben Aissia, Habib
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2017
Elsevier
Subjects
Buoyancy-thermocapillary
Entropy generation
Nanofluids
3D
Buoyancy-thermocapillary
Nanofluids
Entropy generation
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Summary:Heat transfer, fluid flow and entropy generation due to combined buoyancy and thermocapillary forces in a 3D differentially heated enclosure containing Al2O3 nanofluid are carried out for different Marangoni numbers and different nanoparticles concentrations. The vector potential-vorticity formalism and the finite volume method are used respectively to formulate and to solve the governing equations and calculations were performed for Marangoni number from −103 to 103, volume fraction of nanoparticles from 0 to 0.2 and for a fixed Rayleigh number at 105. An intensification of the flow and an increase in heat transfer and of total entropy generation occur with the increase in nanoparticles volume fraction for all Marangoni numbers.
ISSN:1110-0168
DOI:10.1016/j.aej.2016.09.005