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首页> 外文期刊>Heat Transfer Engineering >Dynamic Wetting Behavior and Water Drops on Microgrooved Surfaces
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Dynamic Wetting Behavior and Water Drops on Microgrooved Surfaces

机译：微沟槽表面的动态润湿行为和水滴

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摘要

The retention of water on the air-side surface of heat exchangers is important in air conditioning, refrigeration, and heat pumping applications. Recently, surfaces with grooves tens to hundreds of micrometers deep and wide have been proven highly effective in promoting water drainage from heat exchangers. Dynamic wetting behavior governs the motion of drops on such surfaces, and this work provides the first data on the dynamic wetting behavior on microgrooved metallic surfaces. Moving drops on microgrooved surfaces can be in a Wenzel or Cassie-Baxter wetting state. In a Wenzel wetting state, drops are elongated and have a tail; the length of the tail increases with Wenzel roughness. In a Cassie-Baxter wetting state, drops become more elongated as the Cassie-Baxter roughness increases. Drops in the Wenzel and Cassie-Baxter wetting states have dynamic advancing contact angles that increase with drop velocity and dynamic receding contact angles that decrease with velocity. In the Cassie-Baxter state, dynamic contact angles vary linearly with velocity and have larger hysteresis for larger Cassie-Baxter roughness. The behavior is more complicated for drops in the Wenzel state, showing nonlinearity in dynamic contact angles, with generally larger hysteresis for larger Wenzel roughness.
机译：在空调，制冷和热泵应用中，水在热交换器空气侧表面的保留很重要。最近，已证明具有数十至数百微米深和宽的凹槽的表面在促进热交换器的排水方面非常有效。动态润湿行为控制着此类表面上液滴的运动，这项工作提供了有关微沟槽金属表面上动态润湿行为的首个数据。在微槽表面上移动的液滴可能处于Wenzel或Cassie-Baxter润湿状态。在Wenzel润湿状态下，液滴拉长并有尾巴。尾巴的长度随Wenzel粗糙度的增加而增加。在Cassie-Baxter润湿状态下，随着Cassie-Baxter粗糙度的增加，液滴变得更加伸长。 Wenzel和Cassie-Baxter润湿状态下的液滴具有随液滴速度增加的动态前进接触角和随速度减小的动态后退接触角。在Cassie-Baxter状态下，动态接触角随速度线性变化，并且对于较大的Cassie-Baxter粗糙度具有较大的磁滞。对于Wenzel状态的液滴，行为更复杂，动态接触角显示非线性，对于更大的Wenzel粗糙度，通常具有较大的磁滞。

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  • 来源
    《Heat Transfer Engineering》 |2013年第15期|1088-1098|共11页
  • 作者

    XIAOFEI WANG; MD. ASHIQUR RAHMAN; ANTHONY M. JACOBI; PREDRAG S. HRNJAK;

  • 作者单位

    Mechanical Science and Engineering, University of Illinois, Urbana, Illinois, USA;

    Mechanical Science and Engineering, University of Illinois, Urbana, Illinois, USA;

    Mechanical Science and Engineering, University of Illinois, Urbana, Illinois, USA;

    Mechanical Science and Engineering, University of Illinois, Urbana, Illinois, USA,Creative Thermal Solutions, Urbana, Illinois, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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