水の水平管内層状/波状二相流における熱伝達　第二報

（液相部の濡れによる広がりを考慮した熱伝達率予測方法の検討）

抄録

Heat transfer of the stratified/wavy water flow in a horizontal tube is investigated. Considerably low heat transfer in the vapor phase region relative to the liquid phase region produces a large temperature distribution along the perimeter, which makes difficult for deriving the appropriate expression for the heat transfer coefficient. In the 1st report, it was shown that, based on the experiment, the heat transfer coefficient in the liquid phase could be a representative of the entire tube. A model which involved both of convection and evaporation was proposed, where a flat surface of the liquid layer was assumed. In the 2nd report, the spread of the liquid layer due to wetting with the tube surface and its effects on the heat transfer coefficient were accounted for. The prediction agreed with the measured results within approximately 30% error, which is more accurate compared to the prediction for a flat surface.