Investigation on the spray cooling performance with liquid nitrogen

An experimental platform was set up to investigate the factors that affect liquid nitrogen spray cooling. Sixteen groups of experiments were conducted according to the mass flux, spray height, and the surface size of the heat sink. The superheat at the critical heat flux was found to be between 11 K and 22 K. As the heated surface size increased, the heat flux and heat transfer coefficient decreased. In our study, the maximum heat flux was established to be 191.31 x 104 W m- 2 at a superheat of 11.5 K and the maximum heat transfer coefficient was established to be 18.39 x 104 W m- 2 K-1 at a superheat of 9.8 K. The experimental correlation of the Nusselt number for incomplete spray coverage, full spray coverage, overspray coverage, and all the data had a mean absolute deviation of 8.30%, 14.25%, 20.39%, and 19.51%, respectively.

Automated summary

The experimental investigation on liquid nitrogen spray cooling revealed that larger heated surface size leads to decreased heat flux and heat transfer coefficient. The study found the maximum heat flux and maximum heat transfer coefficient under different superheat conditions during spray cooling.