LAMINAR THERMAL-CONVECTION BETWEEN VERTICAL COAXIAL ISOTHERMAL CYLINDERS

A numerical investigation of natural convective heat transfer of a fluid in vertical cylindrical annuli with the inner wall maintained at a higher temperature than the outer wall has been carried out. The top and the bottom plates are insulated for the majority of the cases. Perfectly conducting horizontal walls are also considered for comparison of heat transfer results. Numerical results of heat transfer rates and flow fields for 10 less-than-or-equal-to Ra(L) less-than-or-equal-to 10(6), 1 less-than-or-equal-to K less-than-or-equal-to 15 and 0.3 less-than-or-equal-to A less-than-or-equal-to 10 are reported. Discrepancies in the existing numerical and experimental data are noted and discussed. New correlations for heat transfer rate are given.