Title: Mixed convection of water-based nanofluids in a square enclosure heated and cooled on adjacent walls

Authors: Elif Büyük Öğüt; Kamil Kahveci

Addresses: Vocational School of Hereke, Kocaeli University, 41800 Hereke-Kocaeli, Turkey ' Mechanical Engineering Department, Trakya University, 22180 Edirne, Turkey

Abstract: This study examines the mixed convection of water-based nanofluids in a lid-driven square enclosure heated from one side and cooled from the stationary adjacent side while the other sides are kept stationary and adiabatic. The conservation equations are solved numerically for the stream function, vorticity, and temperature using the differential quadrature method. The Grashof number is kept at a constant value of 104 in the present study, and the Reynolds number is varied so that the Richardson number will have values in the range of 0.1 to 10. Nanoparticles volume fraction is varied as 0%, 5% and 10% and the value of the ratio of the nanolayer thickness to the original particle radius, is fixed to 0.1. The results show that the motion of the side wall and nanoparticle usage has significant effects on the flow and temperature fields. A significant increase in the average Nusselt number is seen with an increase in the volume fraction of nanoparticles and a decrease in the Richardson number.

Keywords: mixed convection; water-based nanofluids; nanotechnology; heating; cooling; differential quadrature method; square enclosures; nanoparticles; flow field; temperature field.

DOI: 10.1504/PCFD.2014.064549

Progress in Computational Fluid Dynamics, An International Journal, 2014 Vol.14 No.5, pp.328 - 340

Published online: 27 Sep 2014 *

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