805 円管内沸騰流の熱伝達と圧力損失 : 強制対流蒸発域の理論解析

概要

論文の詳細を見る
Heat transfer coefficient and pressure drop were simultaneously measured for vertical upward boiling flow of water in a round tube with an inner diameter of 8mm. Frictional pressure drop and heat transfer coefficient were compared with correlations of Chisholm-Laird and the authors in the form of Φ_1^2 and h_<TP>/h_<Lf>/(1-α) against Maltinelli parameter 1/X_<tt>. It was found that the analogy between heat transfer and fluid friction was valid for boiling flow. Numerical calculation of heat transfer coefficient was carried out for annular flow model. Liquid film thickness and wall shear stress was determined from Smith's correlation and our present correlation, respectively. Velocity and temperature profiles were calculated using eddy diffusivity model. Agreement between the experimental and calculated values of heat transfer coefficient was fairly good.
社団法人日本機械学会の論文