Journal
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
Volume 93, Issue -, Pages 48-59Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2018.03.001
Keywords
Nanofluid; Heat transfer; Entropy generation; Single phase model; Shear stress ratio
Categories
Funding
- College of Science and Engineering, University of Glasgow, UK
- Scottish Overseas Research Student Award Scheme (SORSAS), UK
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Single phase model has been used to investigate the flow characteristics of Al2O3-water and TiO2-water nanofluids in a horizontal pipe under constant heat flux boundary condition. SST kappa -omega model has been applied to simulate the flow and thermal fields for a number of physical, thermal and nanofluid conditions. Results generally reveal that the enhancement of heat transfer and entropy generation is dependent on the concentrations, size of nanoparticles and flow Reynolds number. However, the heat transfer rate is predicted to be little bit higher for the Al2O3-water nanofluid than that of the TiO2-water nanofluid. It is also found that there exists no optimal Reynolds number for which the total entropy generation could be optimised. Some new correlations have been proposed and used them to calculate the average Nusselt number using single phase model.
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