Abstract
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.
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