The influence of suspension and deposition on pool boiling heat transfer of nanofluids: Experiment and engineering model study

• Published in: International journal of heat and mass transfer Vol. 227; p. 125614
• Main Authors: Peng, Cheng, Song, Youya, Deng, Jian, Wu, Jiang, Chen, Helin, Liu, Fang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2024
• Subjects: Bubble behavior; Contact angle; Deposition; Predictive model; Suspension; Suspension; Contact angle; Deposition; Predictive model; Bubble behavior
• ISSN: 0017-9310
• DOI: 10.1016/j.ijheatmasstransfer.2024.125614

•The single effect of deposited nanoparticles and the integral effect of deposition and suspension were quantitatively investigated under saturated pool boiling.•With a mass concentration ranging from 0.001 % to 0.005 % and a heat flux range of 60–130 kW/m2, a pool boiling model with error margin within 30 % was produced through the investigation of bubble dynamics.•The major influence of deposited nanoparticles on boiling heat transfer was determined based on the theoretical model. 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.