垂直円柱まわりの過渡膜沸騰熱伝達の実験:円柱の長さ、直径および傾斜角の影響

Abstract

Quenching experiments on the transient film boiling heat transfer from a vertical cylinder to a quiescent saturated water at atmospheric pressure have been carried out. Experimental parameters are length, diameter and inclination angle of the cylinder. The test cylinders used in the experiments are made of silver. The test cylinder was heated to 660 C by a electric furnace and quenching was started at about 550 C. Experimental data were presented in terms of both cooling curve and boiling curve for the case of 32 mm diameter cylinders with the length ranging from 8 mm to 64 mm and for the case of 32 mm length cylinders with the diameter ranging from 8 mm to 50 mm. The effects of length, diameter and inclination angle of the cylinder on the overall heat transfer rate were discussed in terms of boiling curve.

大気圧下で、垂直円柱から静止飽和水への過渡膜沸騰熱伝達に関して、焼入れ実験を行ってきた。円柱長さ、円柱直径および円柱傾斜角を実験パラメータとした。本実験には銀製円柱を用いた。試験円柱を電気炉で660度Cに加熱し、約550度Cで焼入れを開始した。円柱直径32mmで円柱長さを8-64mm、および円柱長さ32mmで円柱直径を8-50mmに変化させた場合における実験データを、冷却曲線および沸騰曲線により示した。全熱伝達率への円柱長さ、円柱直径および円柱傾斜角の影響を沸騰曲線により論じた。