INVESTIGATION OF NATURAL CONVECTION CHARACTERISTICS WITH BROWNIAN MOTION EFFECT USING DIFFERENT NANOFLUIDS

Etaig, Saleh and Hasan, Reaz and Perera, Noel (2018) INVESTIGATION OF NATURAL CONVECTION CHARACTERISTICS WITH BROWNIAN MOTION EFFECT USING DIFFERENT NANOFLUIDS. Multiphase Sciences and Technology, 30 (2-3). pp. 135-152. ISSN 0276-1459

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Abstract

This paper reports the effect of Brownian motion on fluid flow and heat transfer performance using various nanofluids in natural convection in a square enclosure. The energy and Navier–Stokes equations are solved numerically using a finite-volume approach. The effect of Brownian motion was employed based on a thermal conductivity model with a Brownian motion effect. The effect of the volume concentration on the enhancement of heat transfer was studied incorporating the Brownian motion. The influence of the effective thermal conductivity on the enhancement was also investigated for a range of volume fraction concentrations. Various volume concentrations were tested in the present study: 2%, 3%, 4%, and 6%. Different Raleigh numbers were investigated for different nanoparticles. The results revealed that an increase in the volume fraction deteriorates the heat transfer. The velocity gradients were also found to be affected by the volume fraction. The temperature profile for different Rayleigh numbers is presented. Three different nanofluids (Cu–water, TiO–water, and AL2O3–water) were studied.

Item Type:	Article
Uncontrolled Keywords:	heat transfer, computational fluid dynamics (CFD), natural convection, Brownian motion
Subjects:	F200 Materials Science H100 General Engineering H300 Mechanical Engineering H800 Chemical, Process and Energy Engineering
Divisions:	REF UoA Output Collections > REF 2021 UoA12: Engineering Faculty of Computing, Engineering and the Built Environment Faculty of Computing, Engineering and the Built Environment > School of Engineering and the Built Environment
Depositing User:	Noel Perera
Date Deposited:	29 Nov 2018 13:29
Last Modified:	29 Nov 2018 13:29
URI:	http://www.open-access.bcu.ac.uk/id/eprint/6656

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