材料交错分布型传热板表面异态干涉沸腾传热特性研究  

Study of different-mode-interacting boiling heat transfer characteristics on the heating plate with material cross arrangement

作　　者：孟璐璐 谢添玺 陈志豪[1,2] 宇高義郎 MENG Lulu;XIE Tianxi;CHEN Zhihao;UTAKA Yoshi(School of Mechanical Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Efficient Utilization of Low and Medium Grade Energy(Tianjin University),Ministry of Education,Tianjin 300350,China)

机构地区：[1]天津大学机械工程学院,天津300350 [2]中低温热能高效利用教育部重点实验室,天津300350

出　　处：《化工学报》2021年第9期4564-4572,共9页CIESC Journal

基　　金：国家自然科学基金项目(52076146)。

摘　　要：异态干涉沸腾,即不同沸腾强度或者不同沸腾模式(核态、膜态)之间相互干涉,被证实可以提升微小间隙内沸腾传热临界热通量。该现象是在填充了低热导率材料的传热块表面发生的。低热导率材料(PTFE)交错分布结构能够增加不同材料交界面的密度且增强不同沸腾强度或者不同沸腾模式的相互干涉,故被应用于提升微小间隙内的沸腾传热特性。实验结果表明:与均匀传热板和PTFE平行分布传热板相比,PTFE交错分布传热板表面的沸腾传热性能显著提升。材料宽度和间隙尺寸对非均匀板表面的沸腾CHF产生明显影响,随着间隙尺寸的增加,CHF呈上升趋势且最大CHF对应的材料宽度减小。在最优的材料宽度和间隙尺寸的组合下,最大的临界热通量可达到1140 kW/m^(2)且最高的CHF提升比例为84%。Abnormal interference boiling,that is,mutual interference between different boiling intensities or different boiling modes(nucleus state,film state),has been proven to increase the critical heat flux density of boiling heat transfer in a tiny gap.This phenomenon is realized on the nonuniform plate with alternate distribution of high and low conductance materials.The nonuniform plate with material(PTFE)cross arrangement can increase densities of different materials boundaries and enhance the interacting between different boiling intensities or different boiling modes,which is used to improve the boiling heat transfer characteristics in the micro gap.The experimental results show that the boiling heat transfer performance of PTFE cross arrangement is significantly improved compared with uniform copper plates and PTFE parallel arrangement.The material width and gap size have a significant impact on CHF value of the nonuniform plate.As the gap size increases,the CHF shows an increasing trend and the material width corresponding to the maximum CHF decrease.Under the optimal combination of material width and gap size,the maximum CHF can reach 1140 kW/m^(2) and the highest ratio of CHF enhancement is 84%.

关 键 词：传热 界面 气泡 异态干涉沸腾 交错分布 

分 类 号：TK124[动力工程及工程热物理—工程热物理]