Forced convection heat transfer and hydrodynamic behavior of CuO/water nanofluid in rotational concentric annuli

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Faculty of Hormozgan University

Abstract

In the first part of this study, a literature review about forced convection heat transfer of nanofluids and it’s mechanisms are performed. After comparing different models for the effective thermal conductivity and viscosity of nanofluid based on their mechanisms, the best model is chosen to model the heat transfer. Then, the fully developed laminar flow of water/copper oxide nanofluid in the space between two horizontal coaxial cylinders under conditions of forced convection for both the constant temperature and constant heat flux boundary conditions is investigated numerically for the first time. the commercial code that used for the numerical solution is validated with the literature data at the same condition and the results of the comparison have shown very good agreements. The Numerical results show that the volume fraction 1% of nanoparticles is a transition point from the wall heat transfer rate to another rate and increasing the volume fraction has little changes in the friction factor of the inner and outer cylinders. However, the heat transfer and friction factors on both walls is reduced with the increasing Grashof number. Also, the forced convective heat transfer of nanofluids and friction coefficients shows a significant increase with increasing Reynolds number.

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Journal of Solid and Fluid Mechanics
Volume 3, Issue 3 - Serial Number 3
September and October 2013
Pages 121-136

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