Abstract
Natural convection in a bundle of vertical cylinders, arranged in a equilateral triangle, has been studied numerically using a boundary-fitted coordinate system. Numerical calculations for center-to-center distance between cylinders S/D=1.1∼1.9, 3.0, 4.0 and 7.0 were made of natural convection of air at the modified Grashof numbers Gr-* from 10 to 108. The results show that local Nusselt numbers Nu for uniformly heated cylinders have certain constant values in a wide range of cylinder length except the entrance region of bundle, with decreasing Grashof number. Numerical values of local Nusselt number are in relatively good agreement with those obtained from experiments in air.
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