Optimization of natural convection heat transfer of Newtonian nanofluids in a cylindrical enclosure

doi:10.1016/j.cjche.2015.04.002

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (8): 1266-1274.DOI: 10.1016/j.cjche.2015.04.002

Optimization of natural convection heat transfer of Newtonian nanofluids in a cylindrical enclosure

Hamid Moradi¹, Bahamin Bazooyar², Ahmad Moheb¹, Seyed Gholamreza Etemad¹

1 Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;
2 Ahvaz Faculty of Petroleum Engineering, Petroleum University of Technology, Ahvaz, P.O. Box 6198144471, Iran

收稿日期:2014-05-09 修回日期:2015-03-17 出版日期:2015-08-28 发布日期:2015-09-26
通讯作者: Bahamin Bazooyar

Optimization of natural convection heat transfer of Newtonian nanofluids in a cylindrical enclosure

Hamid Moradi¹, Bahamin Bazooyar², Ahmad Moheb¹, Seyed Gholamreza Etemad¹

1 Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;
2 Ahvaz Faculty of Petroleum Engineering, Petroleum University of Technology, Ahvaz, P.O. Box 6198144471, Iran

Received:2014-05-09 Revised:2015-03-17 Online:2015-08-28 Published:2015-09-26
Contact: Bahamin Bazooyar

摘要/Abstract

摘要： This study characterizes and optimizes natural convection heat transfer of two Newtonian Al₂O₃ and TiO₂/water nanofluids in a cylindrical enclosure. Nusselt number (Nu) of nanofluids in relation to Rayleigh number (Ra) for different concentrations of nanofluids is investigated at different configurations and orientations of the enclosure. Results show that adding nanoparticles towater has a negligible or even adverse influence upon natural convection heat transfer of water: only a slight increase in natural convection heat transfer of Al₂O₃/water is observed, while natural convection heat transfer for TiO₂/water nanofluid is inferior to that for the base fluid. Results also reveal that at low Ra, the likelihood of enhancement in natural convection heat transfer ismore than at high Ra: at low Ra, inclination angle, aspect ratio of the enclosure and nanoparticle concentration influence natural convection heat transfer more pronouncedly than that in high Ra.

关键词: Natural convection heat transfer, Nanofluid, Optimization, Cylinder orientation

Abstract: This study characterizes and optimizes natural convection heat transfer of two Newtonian Al₂O₃ and TiO₂/water nanofluids in a cylindrical enclosure. Nusselt number (Nu) of nanofluids in relation to Rayleigh number (Ra) for different concentrations of nanofluids is investigated at different configurations and orientations of the enclosure. Results show that adding nanoparticles towater has a negligible or even adverse influence upon natural convection heat transfer of water: only a slight increase in natural convection heat transfer of Al₂O₃/water is observed, while natural convection heat transfer for TiO₂/water nanofluid is inferior to that for the base fluid. Results also reveal that at low Ra, the likelihood of enhancement in natural convection heat transfer ismore than at high Ra: at low Ra, inclination angle, aspect ratio of the enclosure and nanoparticle concentration influence natural convection heat transfer more pronouncedly than that in high Ra.

Key words: Natural convection heat transfer, Nanofluid, Optimization, Cylinder orientation

Hamid Moradi, Bahamin Bazooyar, Ahmad Moheb, Seyed Gholamreza Etemad. Optimization of natural convection heat transfer of Newtonian nanofluids in a cylindrical enclosure[J]. Chinese Journal of Chemical Engineering, 2015, 23(8): 1266-1274.

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Optimization of natural convection heat transfer of Newtonian nanofluids in a cylindrical enclosure

Optimization of natural convection heat transfer of Newtonian nanofluids in a cylindrical enclosure

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