Abstract
Experiments are conducted to assess the heat transfer benefits of the hydrophilic coating on a rectangular minichannel. The spray pyrolysis technique is used to obtain the surfactant added ZnO–Al2O3 coatings. The effect of surfactant weight percentage on hydrophilicity has been investigated using the static contact angle meter. An appreciable enhancement in the critical heat flux (CHF) and the average heat transfer coefficient (HTC) are observed on surfactant added ZnO–Al2O3 coatings compared to pure ZnO coatings. A maximum enhancement of 44.6% in CHF and 29.7% in HTC are observed for the 4wt.% surfactant added ZnO–Al2O3 composite coating, for a mass flux of 88kg/m2s.
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