Title: Nanofluids natural convection heat transfer in horizontal annulus

Authors: O. Zeitoun, Mohamed E. Ali

Addresses: Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh, 11421, Saudi Arabia. ' Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh, 11421, Saudi Arabia

Abstract: The effect of using nanoparticles on natural convection heat transfer in horizontal cylindrical annuli was investigated numerically using finite volume technique together with SIMPLE algorithm for D_o/D_i = 2 and 1.25. Aluminium oxide (Al₂O₃) nanoparticles in water as base fluid were used in the current investigation. Laminar conditions up to Rayleigh number Ra of 10⁹ were investigated for 0%, 1% and 4% nanoparticle concentrations. The results indicated that nanoparticles can increase heat transfer in the conduction dominated regime while it decreases it in the convection dominated regime.

Keywords: nanofluids; natural convection; heat transfer; laminar; horizontal; cylindrical annulus; nanotechnology; nanoparticles.

DOI: 10.1504/IJNP.2009.028750

International Journal of Nanoparticles, 2009 Vol.2 No.1/2/3/4/5/6, pp.173-181

Published online: 30 Sep 2009 *

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