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TECHNICAL BRIEFS

Fully Developed Couette Flow of Three Fluids With Variable Thermophysical Properties Flowing Through a Porous Medium Channel Heated Asymmetrically With Large Temperature Differences

[+] Author and Article Information
Asterios Pantokratoras

School of Engineering, Democritus University of Thrace, 67100 Xanthi, Greeceapantokr@civil.duth.gr

J. Heat Transfer 129(12), 1742-1747 (Dec 14, 2006) (6 pages) doi:10.1115/1.2768103 History: Received April 12, 2006; Revised December 14, 2006

In this paper, we study the steady laminar flow in a fluid-saturated porous medium channel bounded by two parallel plates with constant but unequal temperatures. One plate is moving with constant velocity while the other is stationary. For the porous medium, the Brinkman–Darcy–Forchheimer model is used. The investigation concerns engine oil, water, and air, taking into account the variation of their physical properties with temperature. The results are obtained with the direct numerical solution of the governing equations and cover large temperature differences. It is found that dynamic viscosity plays an important role on the results, which depart significantly from those of a fluid with constant properties when the temperature difference between the plates is large. Except that there are cases where the flow is restricted near the moving plate while at the lower part of the channel, the fluid is motionless.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Velocity distribution for oil: solid and bold lines correspond to variable ρ and μ while dashed lines correspond to constant properties

Grahic Jump Location
Figure 2

Velocity distribution for water: solid and bold lines correspond to variable ρ and μ while dashed lines correspond to constant properties

Grahic Jump Location
Figure 3

Velocity distribution for air: solid and bold lines correspond to variable ρ and μ while dashed lines correspond to constant properties

Grahic Jump Location
Figure 4

Velocity and temperature distribution for air: solid and bold lines correspond to variable ρ, μ, k, and φ=0.5 while dashed lines correspond to constant properties

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