水平上向き加熱平板上自然対流の乱流遷移機構について

概要

論文の詳細を見る
Flow and heat transfer of natural convection over heated horizontal plate was investigated both experimentally and analytically. The main concerns are the turbulent transition mechanisms and the local heat transfer characteristics of transition region. In order to investigate the mechanisms of turbulent transition, an unsteady, three-dimensional analysis has been performed on the water flow over 150 mm wide plate heated with uniform heat flux. The results showed that longitudinal vortices appear over the plate when the local modified Rayleigh numbers exceed 3.5×10^6. These vortices develop toward downstream, then, lose their regularity and, finally, a turbulent transition occurs over the plate. By comparing these results with visualizations on the flow and temperature fields and also with the local heat transfer coefficients botained from the experiment, it was confirmed that the present analysis well predicts actual transition process.
社団法人日本機械学会の論文
1999-12-25