Abstract
Numerical results are presented for natural convection in a horizontal pipe insulation with radial baffles. It has been shown that radial baffles are effective in reducing convective heat losses from pipe insulation. The effectiveness in the reduction of heat loss depends on the length and orientation of the baffles. For the cases examined in this study, the baffles with a length of H/D = 0.5 give the best result. At Ra = 500, the flow and temperature fields become unstable for some pipe-baffles configurations. The averaged heat transfer rate, however, is still less when using baffles. 10 refs.
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