矩形断面流路内における沸騰に関する研究 : 上壁が加熱される流路の水平と傾斜角度5°の比較(熱工学,内燃機関,動力など)  [in Japanese] Study on Boiling in a Channel with Rectangular Cross Section : Comparison between a Horizontal and Inclination Angle of 5° for Upper Heated Wall  [in Japanese]

The purpose of this study is to clarify the boiling in a horizontal channel and the one of the inclination angle θ of 5° with rectangular section and the behavior of bubble generated from the heated upper wall experimentally. This channel is submerged into the saturated pure water and both sides of the channel are opened. The height H of the channel is between 3 and 14.5 mm. In the case of θ of 0°, the whole heated wall is always covered with coalescent bubble and burnout occurs easily. In the case of θ of 5°, the condition of the heated wall surface depends on the channel height. For H ≦ 4 mm, nucleate boiling continues owing to the periodical inflow of water to the whole heated wall. For H ≧ 5 mm, the heat transfer is the nucleate boiling at a part of the heated wall and the natural convection at the other part. The slight inclination of the channel improves remarkably the characteristics of the heat transfer.