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LAMINAR FORCED FLOW AND HEAT TRANSFER ENHANCEMENT BY USING WATER-BASED NANOFLUIDS IN A MICROCHANNEL

DOI: 10.1615/ICHMT.2008.CHT.140
16 pages

Cong Tam Nguyen
Faculty of Engineering, Universite de Moncton, Moncton, New Brunswick, Canada E1A 3E9

Mojtaba Jarrahi Khameneh
ENSMA, BP 40109, 86961 FUTUROSCOPE CHASSENEUIL CEDEX, Poitiers, France

Nicolas Galanis
THERMAUS, Département de génie mécanique, Université de Sherbrooke, Sherbrooke J1K 2R1, Quèbec, Canada

Abstract

In this work, the problem of laminar forced convection flow and heat transfer of nanofluids inside a uniformly heated rectangular-cross-section microchannel was numerically investigated, using the classical assumption of homogeneous-single-phase fluid and a full 3D mathematical model. For the three water-based nanofluids considered, namely water-Al2O3 with 36nm and 47 nm particle sizes and water-CuO with 29nm particle-size, available experimental data for nanofluids thermal conductivity and dynamic viscosity were employed. Numerical results obtained for the range: Reynolds number from 200 to 1500, Prandtl number varying from 7 to 32 and particle volume fraction from 0 to 9%, have eloquently shown that the inclusion of nanoparticles into the base fluid produces a considerable increase of the heat transfer coefficient, which, in turn, has reduced fluid and channel wall temperatures. Such an enhancement clearly becomes more pronounced with an increase of particle volume fraction and/or the mass flow rate. Results for the averaged heat transfer coefficient and Nusselt number as function of the flow Reynolds number and particle volume fraction are shown and discussed. The influence of the nanoparticle size and nanofluid type on the heat transfer enhancement is also shown.

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