Hydrophobic modification of TiO2 and study on nucleation boiling heat transfer properties of modified TiO2 based nanofluid
ZHANG Ze-yu, LANG Zhong-min, WU Gang-qiang, GAO Xiang-yang, KANG Ying-jie
Inner Mongolia Key Laboratory of Coal Chemical and Coal Comprehensive Utilization, School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China
Abstract: Nano TiO2 is modified by perfluorodecyltrimethoxysilane to effectively enhance the aggregation properties of nanoparticles.TiO2 nanofluids with the same concentration range before and after modification are prepared by a two-step method,and the effects of thermal conductivity and static contact angle of the two groups of nanofluids on the nuclear boiling heat transfer characteristics are investigated.The results demonstrate that at a mass fraction of 0.05%,the boiling heat transfer coefficient of unmodified TiO2 nanofluid is up to 16.3% higher than that of deionized water,but that of modified TiO2 nanofluid is 28.57% higher than that of deionized water.Furthermore,the critical heat flux of modified TiO2 nanofluid is 11.68% lower than that of unmodified TiO2 nanofluid.Thermal conductivity and contact angle are the main factors affecting the boiling heat transfer characteristics of nanofluids with different wettability.The nanofluids with poor wettability tend to start boiling in advance and form nucleation points,but the increase in heat flux causes bubbles to merge and deteriorate heat transfer.
张泽玉, 郎中敏, 吴刚强, 高向阳, 康英杰. 改性TiO2及其纳米流体的核沸腾传热特性[J]. 现代化工, 2023, 43(1): 116-121.
ZHANG Ze-yu, LANG Zhong-min, WU Gang-qiang, GAO Xiang-yang, KANG Ying-jie. Hydrophobic modification of TiO2 and study on nucleation boiling heat transfer properties of modified TiO2 based nanofluid. Modern Chemical Industry, 2023, 43(1): 116-121.
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