Analysis of unsteady mixed convection of Cu–water nanofluid in an oscillatory, lid-driven enclosure using lattice Boltzmann method

Ardalan, M. V., Alizadeh, R., Fattahi, A., Rasi, N. A., Doranehgard, M. H. and Karimi, N. (2020) Analysis of unsteady mixed convection of Cu–water nanofluid in an oscillatory, lid-driven enclosure using lattice Boltzmann method. Journal of Thermal Analysis and Calorimetry, (doi: 10.1007/s10973-020-09789-3) (Early Online Publication)

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Abstract

The unsteady physics of laminar mixed convection in a lid-driven enclosure filled with Cu–water nanofluid is numerically investigated. The top wall moves with constant velocity or with a temporally sinusoidal function, while the other walls are fixed. The horizontal top and bottom walls are, respectively, held at the low and high temperatures, and the vertical walls are assumed to be adiabatic. The governing equations along with the boundary conditions are solved through D2Q9 fluid flow and D2Q5 thermal lattice Boltzmann network. The effects of Richardson number and volume fractions of nanoparticles on the fluid flow and heat transfer are investigated. For the first time in the literature, the current study considers the mechanical power required for moving the top wall of the enclosure under various conditions. This reveals that the power demand increases if the enclosure is filled with a nanofluid in comparison with that with a pure fluid. Keeping a constant heat transfer rate, the required power diminishes by implementing a temporally sinusoidal velocity on the top wall rather than a constant velocity. Reducing frequency of the wall oscillation leads to heat transfer enhancement. Similarly, dropping Richardson number and raising the volume fraction of the nanoparticles enhance the heat transfer rate. Through these analyses, the present study provides a physical insight into the less investigated problem of unsteady mixed convection in enclosures with oscillatory walls.

Item Type:Articles
Status:Early Online Publication
Refereed:Yes
Glasgow Author(s) Enlighten ID:Karimi, Dr Nader
Authors: Ardalan, M. V., Alizadeh, R., Fattahi, A., Rasi, N. A., Doranehgard, M. H., and Karimi, N.
College/School:College of Science and Engineering > School of Engineering
Journal Name:Journal of Thermal Analysis and Calorimetry
Publisher:Springer
ISSN:1388-6150
ISSN (Online):1572-8943
Published Online:20 May 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Journal of Thermal Analysis and Calorimetry 2020
Publisher Policy:Reproduced under a Creative Commons licence

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