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Heat transfer performance and influences of spray cooling under quenching

ABSTRACT
In this study, a closed-loop spray cooling system using R134a as the working fluid was established. The heat transfer characteristics and influencing mechanism of transient spray cooling were studied. The transient spray cooling curve under quenching was built accurately. The results show that the vapor film suppressed time tsup is the main period that the spray cooling must pass through. The flow rate and the sub-cooling of R134a have little effect on the cooling rate but the critical heat flux, which are mainly affected by chamber pressure. The transient Jacob number Ja* decreases with the increases of chamber pressure. As Ja* decreases, the growth of vapor film is inhibited, then the tsup reduces in consequence. The surface temperature drop point and critical heat flux increases with the rise of chamber pressure. The maximum critical heat flux is 70.08 W/cm2in this experiment.
KEYWORDS
PAPER SUBMITTED: 1970-01-01
PAPER REVISED: 2020-11-25
PAPER ACCEPTED: 2020-12-08
PUBLISHED ONLINE: 2021-01-02
DOI REFERENCE: https://doi.org/10.2298/TSCI200825349Z
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