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

Sehyun Shin, Young I. Cho, William K. Gringrich, Wei Shyy

Research output: Contribution to journalArticle

36 Citations (Scopus)

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 H1 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.

Original languageEnglish
Pages (from-to)4365-4373
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Volume36
Issue number18
Publication statusPublished - 1993 Dec 1
Externally publishedYes

Fingerprint

laminar heat transfer
ducts
Ducts
Viscosity
viscosity
Nusselt number
Heat transfer
Fluids
augmentation
fluids
Transfer Factor
friction factor
liquid cooling
conservation equations
finite volume method
Prandtl number
Finite volume method
viscous fluids
heat exchangers
Temperature

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Energy(all)
  • Engineering(all)
  • Mechanical Engineering

Cite this

Numerical study of laminar heat transfer with temperature dependent fluid viscosity in a 2 : 1 rectangular duct. / Shin, Sehyun; Cho, Young I.; Gringrich, William K.; Shyy, Wei.

In: International Journal of Heat and Mass Transfer, Vol. 36, No. 18, 01.12.1993, p. 4365-4373.

Research output: Contribution to journalArticle

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