水の水平管内層状/波状二相流における熱伝達　第一報

(熱伝達の特性と熱伝達率予測方法の提案)

抄録

Heat transfer of the stratified/wavy water flow in a horizontal tube is investigated. Under uniform heating, considerably low heat transfer in the vapor phase region relative to the liquid phase region produces a large circumferential temperature distribution, which makes useless to apply the averaged heat transfer coefficient over the perimeter for the estimation of the heat transfer area of heat exchangers. From the distributions of the actual surface heat flux evaluated experimentally, it is confirmed that the heat circumferentially conducted through the tube over the vapor phase region does not affect the liquid phase region due to the high heat transfer in the proximity of the phase boundary. The heat transfer coefficient in the liquid phase is regarded as a representative of the heat transfer of the stratified/wavy flow and predicted by accounting for the contributions of convection and evaporation and compared with measurements.