The thermal characteristics of two-phase water were experimentally studied under 0.5–5.0 MPa in the 1.0 mm × 50 mm and 2.5 mm × 50 mm narrow rectangular channels. The experimental results about the onset of nucleate boiling (ONB) and the two-phase heat transfer demonstrate the followings. At the onset of nucleate boiling, the wall superheat, inlet subcooling and pressure were discussed. It seemed the inlet subcooling and pressure to have the same effect on ONB. The influence factors of two-phase heat transfer characteristics were investigated in 1.0 mm and 2.5 mm narrow rectangular channels. It is revealed that bubble detaching diameter is an important factor affecting two-phase heat transfer in the narrow rectangular channels.

在1.0 mm×50 mm和2.5 mm×50 mm狭窄矩形通道中，在0.5–5.0 MPa下对两相水的热特性进行了实验研究。关于核沸腾（ONB）的发生和两相传热的实验结果证明了以下几点。在成核沸腾开始时，讨论了壁过热，入口过冷和压力。看来入口过冷和压力对ONB的影响相同。在1.0mm和2.5mm的窄矩形通道中研究了两相传热特性的影响因素。揭示了气泡分离直径是影响窄矩形通道中两相传热的重要因素。