Pool boiling heat transfer enhancement of R134a, R32, and R600a using reentrant cavity surfaces

The nucleated pool boiling heat transfer experiments for plain and five different reentrant cavity copper tube surfaces in saturated R134a, R32, and R600a have been carried out. The experiments are carried for heat fluxes ranging from 6.92 to 51.71 kW/m(2) at saturation temperatures of 7 degrees C and 10 degrees C. A significant increase in the boiling heat transfer coefficient has been observed for all tube surfaces with the reentrant cavity. The nucleate boiling heat transfer coefficient for R134a, R32, and R600a is 1.2-2.8 times more than that for plain tube surfaces. A correlation for reentrant cavity surfaces has also been developed.

Automated summary

Nucleated pool boiling heat transfer experiments were conducted on plain and five different reentrant cavity copper tube surfaces using saturated R134a, R32, and R600a. It was found that the boiling heat transfer coefficient significantly increased with the presence of the reentrant cavity structure, being 1.2-2.8 times higher than that of the plain tube surfaces. A correlation for the reentrant cavity surfaces was also developed.