Influence of nanoparticles deposition on surface roughness and heat transfer characteristics of nanofluids - A review

Abstract

The inherent low thermal conductivity of working fluids used in transferring heat from energy system makes the performance of the system less efficient. The introduction of nanoparticles into the working fluid enhances the thermal conductivity of the fluid, thereby improving the overall performance of the energy system. Deposition of nanoparticles on the heat transfer surface of the heat exchanger occurs and this affects the mechanism of bubble formation, wettability, surface roughness of the heating surface and the overall heat transfer coefficient. In this review, the use of nanofluid showed improvement in the critical heat transfer flux (CHF) of the heat transfer fluid while the deposition of nanoparticles on the heater surface enhanced the wettability for pool boiling but caused deterioration in the heat transfer. The influence of nanoparticles deposition on surface characteristics and heat transfer coefficient during single and two phase flows in flow boiling needs to be further investigated.