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首页> 外文期刊>International Journal of Heat and Mass Transfer >Two-dimensional mesoscale simulations of saturated pool boiling from rough surfaces. Part Ⅰ: Bubble nucleation in a single cavity at low superheats
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Two-dimensional mesoscale simulations of saturated pool boiling from rough surfaces. Part Ⅰ: Bubble nucleation in a single cavity at low superheats

机译：粗糙表面沸腾的二维中尺度模拟。第一部分：低过热度下单腔中的气泡成核

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摘要

Bubble nucleation, growth and departure from a single cavity on the top of a uniformly hydrophilic heater and a uniformly hydrophobic heater at low superheats are investigated numerically based on a recently developed liquid-vapor phase-change lattice Boltzmann method. A conjugate 2D heat transfer problem, including heat conduction in the heated plate with a finite thickness, is considered in this paper. It is found that bubble nucleation starts in the central part of a hydrophilic cavity and at corners of a hydrophobic cavity. In addition, the bubble departure diameter from the single cavity increases with the increase of the contact angle on a uniform wettability surface. It is also found that there is little effect on bubble behaviors if the cavity depth is small, but there is a sudden jump in bubble departure frequency from a hydrophilic cavity when the cavity depth reaches a critical value, causing the formation of a residual bubble in the hydrophilic cavity. There also exists a critical cavity width, beyond which the bubble departure diameter and bubble departure frequency increase with the increase of cavity width, and therefore enhancing boiling heat flux. The three-phase contact line region exhibits the highest local heat flux and lowest local temperature along the rough heating surface, and its location greatly affects the direction of heat transfer on the vertical side walls of the cavity. The three-phase contact line is pinned at the cavity mouth on a uniformly hydrophilic rough surface while it is expanded to outside of the cavity mouth on a uniformly hydrophobic rough surface. For a mixed wettability rough surface with a hydrophobic cavity on a hydrophilic surface, it is shown that the hydrophobic cavity promotes bubble nucleation at low wall superheats while the hydrophilic surface prevents the forward expansion of the three-phase contact line outside of the cavity mouth.
机译：基于最新开发的液-汽相变格子玻尔兹曼方法，对低过热度下均匀亲水加热器和均匀疏水加热器顶部的单个气泡的成核，生长和偏离进行了数值研究。本文考虑了共轭二维传热问题，包括在有限厚度的加热板上的热传导。发现气泡成核始于亲水腔的中心部分和疏水腔的角。另外，气泡从单个腔的离开直径随着均匀润湿性表面上的接触角的增加而增加。还发现，如果空腔深度较小，则对气泡行为的影响很小，但是当空腔深度达到临界值时，气泡从亲水性空腔离开的频率会突然跳升，从而导致残留气泡的形成。亲水腔。还存在临界腔宽​​度，超过该临界腔宽度，气泡离开直径和气泡离开频率随腔宽度的增加而增加，并因此提高沸腾热通量。三相接触线区域沿粗糙的加热表面表现出最高的局部热通量和最低的局部温度，并且其位置极大地影响了空腔垂直侧壁上的传热方向。三相接触线固定在均匀亲水的粗糙表面上的腔口处，同时在均匀疏水的粗糙表面上扩展到腔口的外部。对于在亲水性表面上具有疏水性空腔的混合润湿性粗糙表面，表明疏水性空腔在低壁过热时促进气泡成核，而亲水性表面则防止三相接触线在空腔口外向前膨胀。

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  • 来源
  • 作者

    Shuai Gong; Ping Cheng; Xiaojun Quan;

  • 作者单位

    MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR 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

    Pool boiling; Lattice Boltzmann method; Cavity; Bubble; Wettability;

    机译：池沸腾;格子波尔兹曼法腔;气泡;润湿性;

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