微重力池沸腾实验研究

EXPERIMENTAL STUDY ON POOL BOILING IN MICROGRAVITY

本文利用我国第22颗返回式卫星开展了微重力条件下过冷池沸腾传热实验研究。实验中采用桥式自反馈电路控制加热面温度,加热元件为长30mm、直径60μm的铂丝,实验工质为0．1 MPa压力下过冷度为26℃的R113。实验发现,沸腾起始温度不受重力水平影响,而微重力核态沸腾传热略有增强,汽泡脱落行为也有着不同的特征。

A series of experiments on subcooled pool boiling in microgravity have been performed aboard the 22^nd Chinese recoverable satellite. The temperature of heater is controlled using a bridge feedback electric circuit. A platinum wire of 60 μm in diameter and 30 mm in length was simultaneously used as heaters and thermometers. The fluid was R113 at 0.1 MPa and subcooled by 26℃ nominally for all cases. It＇s not found any change of the temperature of the onset of boiling in different gravity conditions. For nucleate boiling, the heat transfer is slightly enhanced, while the bubble patterns have different characteristics in microgravity.