Abstract
Temperature measurement and visualization of cryogenic cavitating flows in a nozzle were conducted with liquid nitrogen in order to clarify the correlation between the thermodynamic effect and the aspect of the cavitating flows. Firstly, the throat temperature gradually decreased as the cavity bubbles occurred and grew in the nozzle throat with the reduction in the inlet cavitation number. Next, the outlet temperature began to decrease when the cavitation number was 0.2 and cavity bubbles widely spread to the downstream. Finally, the inlet temperature began to decrease when the cavitation number was below zero and then the cavity bubbles seemed to occur and flow from the upstream into the nozzle throat. Consequently, temperature depression at each measurement location could be qualitatively explained to be affected by the cavitating flow.
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