Nanofluids natural convection heat transfer in horizontal annulus
by O. Zeitoun, Mohamed E. Ali
International Journal of Nanoparticles (IJNP), Vol. 2, No. 1/2/3/4/5/6, 2009

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.

Online publication date: Wed, 30-Sep-2009

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