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Mesoscale simulations of saturated pool boiling heat transfer under microgravity conditions

机译:微重力条件下饱和池沸腾传热的中尺度模拟

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摘要

Microgravity effects on pool boiling heat transfer from a horizontal hydrophilic surface under constant wall temperature are simulated numerically based on an improved liquid-vapor phase-change lattice Boltzmann method with the imposition of a conjugate thermal boundary condition at solid/liquid interface. Effects of microgravity on bubble departure diameter and bubble departure frequency are investigated. Both the bubble departure diameter and the duration of one bubble cycle are found to be increasing with decreasing gravity levels. Boiling curves under normal gravity and microgravity are numerically obtained and compared. It is shown that gravity has significant effects on pool boiling curves from nucleate boiling to critical heat flux, and from transition boiling to film boiling heat transfer. Moreover, the critical heat flux is lower and it occurs at a lower wall superheat under microgravity conditions than under normal gravity. Effects of heater size in pool boiling under both of microgravity and normal gravity conditions are investigated as well.
机译:在固-液界面上施加共轭热边界条件的基础上,采用改进的液-气相变相玻尔兹曼方法,数值模拟了恒定壁温下微重力对水平亲水表面池沸腾传热的影响。研究了微重力对气泡离开直径和气泡离开频率的影响。发现气泡离开直径和一个气泡循环的持续时间都随着重力水平的降低而增加。计算并比较了法向重力和微重力下的沸腾曲线。结果表明,重力对从核沸腾到临界热通量以及从过渡沸腾到薄膜沸腾的传热对池沸腾曲线有显着影响。而且,临界热通量较低,并且它在微重力条件下的壁过热度低于正常重力下的壁过热度。还研究了微重力和正常重力条件下加热器尺寸对池沸腾的影响。

著录项

  • 来源
  • 作者单位

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

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

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

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

    Boiling curves; Lattice Boltzmann method; Microgravity; Pool boiling;

    机译:沸腾曲线;格子波尔兹曼法微重力泳池沸腾;

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