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Numerical study of laminar heat transfer with temperature dependent fluid viscosity in a 2:1 rectangular duct
Journal article   Peer reviewed

Numerical study of laminar heat transfer with temperature dependent fluid viscosity in a 2:1 rectangular duct

Shin Sehyun, Young I. Cho, William K. Gringrich and Wei Shyy
International journal of heat and mass transfer, v 36(18), pp 4365-4373
1993
DOI: https://doi.org/10.1016/0017-9310(93)90121-L

Abstract

The present study investigates the influence of variable viscosity of temperature-dependent fluids on the laminar heat transfer and friction factor in a 2:1 rectangular duct. The H 1 thermal boundary condition corresponding to axially constant heat flux and peripherally constant temperature was adopted for a top-wall-heated configuration. The governing conservation equations of mass, momentum, and energy were solved using a finite volume method, and the range of the Prandtl number was from 7 to 15000. The present numerical results of local Nusselt numbers for oil showed 70—80% enhancement over those of a constant property fluid and 40—50% enhancement over water, and gave excellent agreement with recent experimental results [ Int. J. Heat Mass Transfer 35, 641—648 (1992)]. The heat transfer enhancement from the heated top wall was due to an increased velocity gradient near the wall. The study proposes a new correlation for local Nusselt numbers in the 2:1 rectangular duct, which covers both thermally developing and thermally fully developed regions. Consequently, a temperature-dependent viscous fluid with a non-circular duct is proposed for use in the design of a liquid cooling module for the computer industry and in compact heat exchangers in general.

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Web of Science research areas
Engineering, Mechanical
Mechanics
Thermodynamics
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