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Description
This study investigates the optimization of heat transfer performance in a liquid nitrogen (LN2) cooling system developed for the Synchrotron Radiation Research Center. The focus is on the cool-down process from ambient temperature to a cryogenic steady state. During the initial cooling phase, the substantial wall superheat upon contact between the LN2 and the Oxygen-Free High-Conductivity Copper (OFHC) base tends to induce the formation of a vapor film, resulting in inefficient film boiling. To overcome this thermal barrier, this research aims to investigate the influence of surface roughness as a critical parameter on the boiling heat transfer mechanisms.
The experiments involve varying the geometric structure of the OFHC surface. This study provides a detailed analysis of the transition behavior from film boiling to nucleate boiling and the variations in critical heat flux (CHF) during the cool-down process. The results are expected to establish optimized surface processing parameters, effectively shortening the system cool-down time and enhancing cooling stability. These findings will serve as a significant reference for the thermal design of cryogenic systems in synchrotron radiation facilities.
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