鉛直円管内における低プラントル数流体の自然・強制複合対流

概要

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Numerical analyses have been conducted for combined free and forced laminar convection of low-Prandtl-number fluids in a vertical pipe. The effects of both buoyancy force and axial heat conduction on the hydrodynamic and thermal characteristics are systematically investigated for the fluid heating and cooling with upward flow at Pe=0.7 to 71(Pγ=0.007 to 0.71 with Re=50 and 100) and |Gγ/Re|=10 to 500. At relatively high |Gγ/Re|, flow reversals are produced at the center of a pipe and near the wall in the heating and cooling cases, respectively. The regime of reverse flow is identified for both heating and cooling cases in Pe vs |Gγ/Re| coordinates. The axial conduction effect becomes significant and even dominant at very low Pe numbers. Numerical results are presented for velocity profiles, streamlines showing the occurrence of flow recirculation, temperature profiles, and distributions of the Nusselt number and wall shear stress with |Gγ/Re| as a parameter.
一般社団法人日本機械学会の論文
1993-11-25