Al_(2)O_(3)微纳米流体对向下加热面沸腾传热的影响  

Effects of micro-nanofluids of Al_(2)O_(3) on boiling heat transfer in downward facing heating

作　　者：周喆 谢怀恩 缪惠芳 高远 张智博 ZHOU Zhe;XIE Huaien;MIAO Huifang;GAO Yuan;ZHANG Zhibo(College of Energy,Xiamen University,Xiamen 361102,China)

机构地区：[1]厦门大学能源学院,福建厦门361102

出　　处：《厦门大学学报（自然科学版）》2022年第1期66-73,共8页Journal of Xiamen University：Natural Science

基　　金：厦门大学能源学院发展基金(2018NYFZ04)。

摘　　要：针对核电站严重事故压力容器外部冷却策略安全裕度不足的问题,利用平均粒径为15和500 nm的两种Al_(2)O_(3)分别制备不同质量浓度的微纳米流体作为冷却剂,通过向下加热面的池沸腾实验,对整个向下加热的沸腾过程进行了详细的研究分析.实验结果表明:纳米颗粒会影响加热表面的润湿能力,提高沸腾过程中的气泡生成率,造成更加剧烈的局部紊流;表面的沸腾传热能力随着微纳米流体质量浓度的升高而增强,在质量浓度为12 mg/L的Boehmite-Al_(2)O_(3)纳米流体工况下测得了最大临界热流密度,与反渗透水工况相比,最大临界热流密度提升了44.7%.Aiming at addressing the issue of insufficient safety of the in-vessel retention through external reactor pressure vessel cooling strategy against severe accidents in nuclear power plants,a pool boiling experiment for downward facing heating was conducted to study and analyze the entire boiling process of the downward facing heating in details,using two types of Al_(2)O_(3)with an average particle size of 15 and 500 nm respectively to prepare micro-nanofluids with different concentrations as coolants.The experimental results showed that nanoparticles affected the wetting ability of the heating surface,increased the bubble generation rate during the boiling process,and caused more intense local turbulence.The surface heat transfer ability was enhanced with the increase in the mass concentration of the micro-nanofluids.In the case of the Boehmite-Al_(2)O_(3)nanofluid with a mass concentration of 12 mg/L,the maximum enhancement of the critical heat flux was increased by 44.7%compared with the reverse-osmosis water case.

关 键 词：微纳米流体 临界热流密度 压力容器外部冷却 增强传热 

分 类 号：TL334[核科学技术—核技术及应用]