Natural convection of micropolar fluids in concentric and vertically eccentric annuli
- National Cheng Kung Univ., Tainan (Taiwan, Province of China)
Natural convection heat transfer of micropolar fluids bounded by two horizontal isothermal cylinders is numerically investigated for various Rayleigh number, radius ratio, and eccentricity. The governing equations, in terms of vorticity, stream function, and temperature, are expressed in a body-fitted coordinate system. The alternate direction implicit method and the successive overrelaxation technique are applied to solve the finite difference form of governing equations. Results indicate the heat transfer rate of a micropolar fluid is smaller than that of a Newtonian fluid, and the main controlling parameter is the dimensionless vortex viscosity. The eccentricity of an annulus heat exchanger may be caused by an imperfect installation. However, the allowance of having a positive eccentricity and enough radius ratio is indeed a benefit from heat transfer point of views. 13 refs.
- OSTI ID:
- 7247162
- Journal Information:
- Journal of Thermophysics and Heat Transfer; (United States), Journal Name: Journal of Thermophysics and Heat Transfer; (United States) Vol. 8:2; ISSN 0887-8722; ISSN JTHTEO
- Country of Publication:
- United States
- Language:
- English
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CONVECTION
ENERGY TRANSFER
FINITE DIFFERENCE METHOD
HEAT EXCHANGERS
HEAT TRANSFER
ITERATIVE METHODS
MASS TRANSFER
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