CuO-Al2O3/H2O纳米流体池沸腾传热实验及分析  

Experimental and analysis of pool boiling heat transfer of CuO-Al2O3/H2O nanofluid

作　　者：贾壮壮 罗竹梅[1] 卿山[1] 雷佳杰 陈鹏飞[1] JIA Zhuang-zhuang;LUO Zhu-mei;QING Shan;LEI Jia-jie;CHEN Peng-fei(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan Province,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093

出　　处：《化学工程》2020年第5期42-47,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(51966005,51566005)。

摘　　要：为探究纳米流体池内沸腾换热特性及其影响因素,利用“两步法”制备了体积分数为0.001%—0.1%的Al 2 O 3/H 2 O、CuO/H 2 O纳米流体以及CuO-Al 2 O 3/H 2 O混合颗粒纳米流体,并进行池内沸腾换热实验。结果表明:测试的体积分数范围内,纳米流体沸腾换热系数随体积分数的增大而增大,起始沸腾过热度随体积分数的增大而降低,纳米流体的传热强化率随热流密度的增大而减小。实验中,混合纳米流体的传热性能始终优于去离子水和单一颗粒的纳米流体,Al 2 O 3、CuO及两者的混合纳米流体沸腾传热系数增强率最高分别达到178.2%,213.2%和253.2%。纳米颗粒的加入对沸腾传热有强化和恶化两方面的作用,在实验的不同阶段,传热效果好坏是热导率、颗粒沉积等共同作用的结果。In order to investigate the boiling heat transfer characteristics in a pool and its influencing factors of nanofluids,Al 2 O 3/H 2 O,CuO/H 2 O nanofluids and CuO-Al 2 O 3/H 2 O hybrid nanofluids with volume fraction of 0.001%-0.1%were prepared by the two-step method and the experiments of boiling heat transfer were carried out.The results show that the boiling heat transfer coefficient increases with the volume fraction increasing,the initial boiling superheat decreases with the volume fraction increasing,and the heat transfer enhancement rate decreases with the heat flow density increasing.In the experiment,the heat transfer performance of hybrid nanofluids is always better than deionized water and single particle nanofluids.The highest enhancement rates of boiling heat transfer coefficient of Al 2 O 3,CuO and their hybrid nanofluids are 178.2%,213.2%and 253.2%,respectively.The addition of nanoparticles can enhance and worsen the boiling heat transfer.In different stages of the experiment,the heat transfer effect is the result of the combined action of thermal conductivity and particle deposition.

关 键 词：纳米流体 沸腾 强化换热 颗粒沉积 

分 类 号：TK124[动力工程及工程热物理—工程热物理]