Abstract
Currently, the majority of research indicates that nanofluids have superior heat transfer capabilities. On the impact of nanofluids on the boiling heat transfer, there is debate. It is still challenging to predict the boiling heat transfer of nanofluids. Based on bubble behavior, the impact of nanoparticles on boiling heat transfer is investigated in this paper. Furthermore, a comparison is made between the percentages of deposited and suspended nanoparticles that influence on boiling heat transfer. According to the findings, deposited nanoparticles improve wettability whereas suspended nanoparticles diminish it. The number of active nucleate sites and the frequency of bubble detachment increase as a result of the influence of suspended and deposited nanoparticles, whereas the diameter of the bubble decreases. This is similar to the trend of the effect of deposited nanoparticles on bubble behavior. Based on the effect of nanoparticles on wettability, predictive models for boiling heat transfer and bubble behavior were proposed, with a range of mass concentrations between 0.001 % and 0.005 % and heat flux between 60 and 130 kW/m2. Less than 30 % was found to be the error between the experimental data and the predictive equations. It was discovered that the influence of deposited nanoparticles on boiling heat transfer was usually dominant, according to the predictions made by theoretical models.
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