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Pool boiling takes place when a stagnant liquid is placed on a surface above the saturation temperature of the liquid. Thermal studies have attracted a large number of researchers working in different segments of the industry to meet the heating and cooling demands of each individual. The pool boiling is a highly effective technique of convective heat transfer to maintain the system operation under safe temperature and safe temperature limits for better performance and longevity. This study investigates the effect of engraved concentric circles on aluminium disc in de-ionized water. The experiments are conducted by varying pitch ratio ( P ) and indentation ratio ( I ) of engraved concentric circles in the range of 0.0125–0.05, and 0.002–0.008, respectively. The maximum enhancement in the boiling heat transfer coefficient is found to be 21.11% more than that of a plain surface corresponding to the pitch ratio of 0.0125 and indentation ratio of 0.008.

Effect of engraved concentric circles on pool boiling of water