Nucleate boiling due to use latent heat instead of sensible heat has an extra potential for dissipating high heat flux, but it needs to control critical heat flux. On the other hand, it is well known that nucleate boiling is strongly under the influence characteristics of surface. One of the methods to control critical heat flux is to change surface characteristics by nanofluid pool boiling. In this study, nanofluids which contain aluminium oxide nanoparticles with four different levels of concentration including 0.002, 0.01, 0.05 and 0.1vol% were used for pool boiling tests at the atmospheric pressure. Tests showed that generally to add nanoparticles will cause the critical heat flux increase and at the certain concentrations about 0.01vol%, critical heat flux has maximum enhancement about 19%. In this research, additionally, the effects of surface parameters such as wettability, roughness and thickness of deposited nanoparticles on the critical heat flux have been analysed.
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