Buoyancy-induced flow of non-Newtonian fluids over a non-isothermal body of arbitrary shape in a fluid-saturated porous medium

1991 ◽  
Vol 48 (1) ◽  
pp. 55-70 ◽  
Author(s):  
A. Nakayama ◽  
H. Koyama
Keyword(s):  
Porous Medium ◽  
Arbitrary Shape ◽  
Saturated Porous Medium ◽  
Newtonian Fluids ◽  
Induced Flow ◽  
Fluid Saturated Porous Medium ◽  
Buoyancy Induced Flow

Mixed Convection Through Vertical Porous Annuli Locally Heated From the Inner Cylinder

1992 ◽  
Vol 114 (1) ◽  
pp. 143-151 ◽  
Author(s):  
C. Y. Choi ◽  
F. A. Kulacki
Keyword(s):  
Porous Medium ◽  
Nusselt Number ◽  
Mixed Convection ◽  
Saturated Porous Medium ◽  
Mean Flow ◽  
Nusselt Numbers ◽  
Induced Flow ◽  
Vertical Annulus ◽  
Buoyancy Induced Flow ◽  
Good Agreement

Mixed convection in a vertical annulus filled with a saturated porous medium is numerically and experimentally investigated. Calculations are carried out under the traditional Darcy assumptions and cover the ranges 10 ≤ Ra ≤ 200 and 0.01 ≤ Pe ≤ 200. Both numerical and experimental results show that the Nusselt number increases with either Ra or Pe when the imposed flow is in the same direction as the buoyancy-induced flow. When the imposed flow opposes buoyancy-induced flow, the Nusselt number first decreases with an increase of the Peclet number and reaches a minimum before increasing again. Under certain circumstances, the Nusselt number for a lower Rayleigh number may exceed that for larger value. Nusselt numbers are correlated by the parameter groups Nu/Pe1/2 and Ra/Pe3/2. Good agreement exists between measured and predicted Nusselt numbers, and the occurrence of a minimum Nusselt number in mean flow that opposes buoyancy is verified experimentally.

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