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 language | English |
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Pages (from-to) | 4365-4373 |
Number of pages | 9 |
Journal | International Journal of Heat and Mass Transfer |
Volume | 36 |
Issue number | 18 |
DOIs | |
Publication status | Published - 1993 Dec |
Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes