期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 126, 期 -, 页码 508-530出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2018.06.026
关键词
Entropy; Carreau fluid; Natural convection; MHD; Mass transfer; LBM
资金
- Hong Kong Polytechnic University
In this paper, thermosolutal natural convection and entropy generation in a heated enclosure with two inner cold cylinders filled with a non-Newtonian Carreau fluid in the presence of a uniform magnetic field has been simulated by Lattice Boltzmann Method (LBM). This study has been conducted for certain pertinent parameters of Rayleigh number (Ra = 10(4) and 10(5)), the Buoyancy ratio (N = 1, 0.1,1), Hartmann number (Ha = 0, 15, 30, 60, and 90), power-law indexes (n = 0.2,1, and 1.8). Results indicate that the rise of Rayleigh number enhances heat transfer for various studied parameters. The increase in power-law index provokes heat and mass transfer to drop gradually. However, the effect of power-law index on heat and mass transfer declines steadily as Hartmann of number causes heat and mass transfer to decline significantly. The augmentation of the buoyancy ratio number enhances heat and mass transfer. The augmentation of Rayleigh number enhances different entropy generations and declines the average Bejan number. The increase in the power-law index provokes various irreversibilities to drop significantly; although, the increase in Hartmann number decreases the influence of power-law index on different entropy generations. The enhancement of the buoyancy ratio causes the summation entropy generations to increase considerably. It was found that the total entropy generation declines as Hartmann augments.(C) 2018 Elsevier Ltd. All rights reserved.
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