An experimental analysis of enhancement of pool boiling heat transfer on copper substrate with addition of surfactant

Abstract

Abstract In this article, the effect of adding Sodium Lauryl Sulphate (SLS), a surfactant to base fluid acetone on heat transfer enhancement during the pool boiling process on a Copper substrate is studied. The aqueous solution is prepared with different concentration of surfactant of SLS varying from 200 ppm to 1000 ppm. By adjusting the super heat degree, the heat flux to the copper working substrate can be changed. The heat transfer coefficient is determined taking different heat flux values and surfactant concentrations. It has been shown that adding surfactant, as opposed to pure liquid, improves the Pool Boiling Heat Transfer Coefficient (PBHTC) when the surfactant concentration is within critical micelle concentration (CMC). The maximum enhancement in heat transfer coefficient is noted as 650 % in 400 PPM aqueous solution of SLS - Acetone at heat flux of 13.636 kW/m2.The lowest surface super heat is found to be 0.9 °C at 19.09 kW/m2 in 400 ppm SLS concentration compared to 3.7 °C in pure acetone. Therefore, the reduction in excess temperature is found to be 75.675 %. When heat flux is 65.45 kW/m2 in 400 ppm solution, the heat transfer coefficient is determined to be 26.18 kW/m2 °C, which is 148% larger than the value of 10.557 kW/m2 °C in pure acetone.