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Experimental investigation on evaporation induced convection in water using laser based measurement techniques.

机译：基于激光的测量技术在水中蒸发引起的对流的实验研究。

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摘要

Recent studies showed that evaporation of water can induce surface tension gradients along the water surface and ultimately lead to convection, known as Marangoni convection. This study was devoted to visualization and characterization of the evaporation-induced, surface-tension-driven convection in water using laser-based measurement techniques.;The evaporation of water at various low vapor-phase pressures in the absence of buoyancy driven flow was investigated. Strong symmetric convection was observed and its velocity field was measured using stereo particle image velocimetry. The temperature field obtained from using both a thermocouple and planar laser induced fluorescence indicated that no buoyancy driven flow was generated. The strength of the convection was found to be correlated with the evaporation rate of water. In addition, the estimated Marangoni number exceeded the critical value for onset of Marangoni convection. It can be concluded that the observed evaporative convection of water can only be Marangoni convection.
机译：最近的研究表明，水的蒸发会引起沿水表面的表面张力梯度，并最终导致对流，这就是所谓的Marangoni对流。本研究致力于使用基于激光的测量技术对水中蒸发引起的，表面张力驱动的对流进行可视化和表征。;研究了在没有浮力驱动流的情况下，在各种低气相压力下水的蒸发。观察到强对称对流，并使用立体粒子图像测速仪测量其速度场。通过使用热电偶和平面激光诱导的荧光获得的温度场表明没有产生浮力驱动的流。发现对流强度与水的蒸发速率相关。另外，估计的马兰戈尼数超过了马兰戈尼对流发生的临界值。可以得出结论，观察到的水的蒸发对流只能是Marangoni对流。

著录项

  • 作者

    Song, Xudong.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.Sc.
  • 年度 2010
  • 页码 105 p.
  • 总页数 105
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

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