HEAT AND MASS TRANSFER AT AN UPSTREAM-FACING BLUNT FACE SITUATED IN A UNIFORM ONCOMING FLOW

Abstract

A numerical investigation was performed to determine the heat /mass transfer from upstream-facing blunt faces of axisymmetric and plane two-dimensional bodies, which are situated such that a uniform flow approaches normal to the respective blunt faces. Face-average and stagnation-point Nusselt and Sherwood numbers, velocity and temperature profiles, and streamline maps are presented over the Reynolds number range from 5 × 103 to5 × 104. Average Nusselt number predictions for Pr = 0.7 (heat transfer in air) and average Sherwood numbers for Sc = 2.5 (naphthalene sublimation in air) agreed well with experiment. These results are well represented by a 0.5-power Reynolds number and 0.4-power Prandtl number fit. Stagnation-point Nusselt and Sherwood number predictions showed excellent agreement with boundary layer results using experimentally measured pressure distributions as input. Boundary layer results based on potential flow velocities as input overpredicted both the present numerical results and experimen...