Heat transfer enhancement studies in pool boiling using hybrid nanofluids

Boiling is a process with maximum heat transfer coefficient (HTC) and heat transfer rate. Researchers are working with techniques such as surface modifications and nanoparticle suspensions in base fluids to enhance the thermal performance. The present work focuses on the enhancement of thermal properties and critical heat flux (CHF) by mixing two different nanoparticles viz., alumina and copper oxide at various concentrations in Deionized (DI) water. Volume concentrations of 0.01 - 0.1% are prepared and the stability of nanofluids is confirmed by Zeta potential. Thermal conductivity of hybrid nanofluids is enhanced by 15.72% for 0.1% concentration at room temperature compared with DI water. CHF of hybrid nanofluids is always higher than single type nanofluid. Maximum enhancement of 49.84% in CHF is obtained for 0.1% concentration. HTC is enhanced by 7.1 and 6.72% for 0.01 and 0.03% volume concentrations than DI water and starts decreasing with increasing volume concentrations.