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How wettability affects boiling heat transfer: A three-dimensional analysis with surface potential energy

机译：润湿性如何影响沸腾的传热：具有表面势能的三维分析

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摘要

How surface wettability affects boiling heat transfer is still a challenging problem at nanoscale. In this work, a three-dimensional analysis of surface potential energy is used to address its relationship to surface wettability and nanoscale pool boiling characteristics of liquid molecules. It is found that the major reason for the enhanced heat transfer by increasing the surface wettability is essentially the improvement of surface potential energy, of which the influence is summarized using logic order. Moreover, the nanoscale boiling of water on copper surfaces with various wettability is investigated, which reveals that the increase in surface wettability can improve the heat transfer coefficient and critical heat flux under high superheat conditions in both nano- and macroscale systems. Besides, the effects of surface potential energy on contact angle, Kapitza resistance, heat transfer coefficient, and critical heat flux are analyzed systematically to demonstrate their relationships. A nondimensional analysis is finally implemented to correlate the normalized surface potential energy (P), the Nusselt number (Nu), and the normalized critical heat flux (J): Nu = 0.081P~(034), J = 0.827P~(0.50) (P < 2.387) and; = 1.221P~(0.05) (P > 2.387). This work provides insights into the enhancement mechanisms for the phase-change heat transfer of liquid molecules over surfaces with different wettability.
机译：如何影响沸腾的传热如何影响纳米级仍然是一个具有挑战性的问题。在这项工作中，使用表面势能的三维分析来解决其与表面润湿性和纳米级池沸腾特性的关系。结果发现，通过增加表面润湿性来增强热传递的主要原因基本上是表面势能的改善，其中使用逻辑顺序总结了影响。此外，研究了具有各种润湿性的铜表面上的水的纳米级沸腾，表明，表面润湿性的增加可以在纳米和宏观系统中的高过热条件下提高传热系数和临界热量。此外，系统地分析了表面电位能量对接触角，Kapitza电阻，传热系数和临界热通量的影响，以展示其关系。最终实施了一种非统治性分析以将归一化表面电位能量（P），NUSERET数（NU）和归一化的临界热通量（j）：nu = 0.081p〜（034），j = 0.827p〜（0.50 ）（p <2.387）和; = 1.221p〜（0.05）（p> 2.387）。这项工作提供了在具有不同润湿性的表面上的相变传热的增强机制的洞察。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121391.1-121391.14|共14页
  • 作者

    Pu Bai; Leping Zhou; Xiaonuo Huang; Xiaoze Du;

  • 作者单位

    Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University) Ministry of Education School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China;

    Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University) Ministry of Education School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China;

    Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University) Ministry of Education School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China;

    Key Laboratory of Power Station Energy Transfer Conversion and System (North China Electric Power University) Ministry of Education School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Surface wettability; Surface potential energy; Nanoscale boiling; Molecular dynamics;

    机译：表面润湿性;表面势能;纳米级沸腾;分子动力学;

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