Stainless steel rods with different thread heights on the surface were subjected to different subcooling de-grees under forced coolant flow conditions in order to investigate the effect of thread height on quench boiling. The effects of thread height and subcooling degree on film evolution and boiling heat transfer characteristics during quench boiling were analyzed by combining the measured temperature data with the visualization results. The results show that an increase in thread form height leads to a rise in the minimum film boiling temperature and the critical heat flux, a decrease in the film collapse time, and an improved heat transfer performance in transition and nucleate boiling stages. An increase in subcooling leads to a rise in the surface cooling rate and the minimum film boiling temperature, and a decrease in the quenching boiling time. However, the effect of thread surface morphology on film boiling time decreases with increasing subcooling. Finally, the reliability of the experiment was verified by comparing the experimental minimum film boiling temperature with the fitting empirical formulae in the literature.
关键词
淬冷沸腾/螺纹表面形貌/过冷度/气膜演变/沸腾传热特性
Key words
quenching boiling/thread surface morphology/subcooling degree/gas film evolution/boiling heat transfer characteristics
维普
万方数据