改性TiO_(2)及其纳米流体的核沸腾传热特性  

Hydrophobic modification of TiO_(2) and study on nucleation boiling heat transfer properties of modified TiO_(2) based nanofluid

作　　者：张泽玉 郎中敏[1] 吴刚强[1] 高向阳 康英杰 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)

机构地区：[1]内蒙古科技大学化学与化工学院,内蒙古自治区煤化工与煤炭综合利用重点实验室,内蒙古包头014010

出　　处：《现代化工》2023年第1期116-121,共6页Modern Chemical Industry

基　　金：国家自然科学基金项目(21868022);内蒙古自治区科技计划项目(2021GG0043)。

摘　　要：采用全氟癸基三甲氧基硅烷对纳米TiO_(2)进行改性,有效改善了纳米粒子的团聚性能。利用两步法分别制备相同浓度范围的改性前/后TiO_(2)纳米流体,考察了2组纳米流体的热导率、静态接触角对核沸腾传热特性的影响。结果表明,在质量分数为0.05%时,未改性纳米流体沸腾传热系数较去离子水最大提高16.3%,改性纳米流体传热系数可提高28.57%,且改性纳米流体临界热通量较未改性纳米流体降低11.68%。热导率和接触角是影响不同润湿性纳米流体具有不同沸腾传热特性的主要因素,润湿性较差纳米流体易提前起沸和形成核化点,但随热通量的增加会造成气泡合并、恶化传热。Nano TiO_(2)is modified by perfluorodecyltrimethoxysilane to effectively enhance the aggregation properties of nanoparticles.TiO_(2)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 TiO_(2)nanofluid is up to 16.3%higher than that of deionized water,but that of modified TiO_(2)nanofluid is 28.57%higher than that of deionized water.Furthermore,the critical heat flux of modified TiO_(2)nanofluid is 11.68%lower than that of unmodified TiO_(2)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.

关 键 词：二氧化钛 疏水改性 纳米流体 强化传热 沸腾传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TB64[动力工程及工程热物理—热能工程]