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首页> 外文期刊>Heat Transfer Engineering >Effect of Surface Tension Variation of the Working Fluid on the Performance of a Closed Loop Pulsating Heat Pipe
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Effect of Surface Tension Variation of the Working Fluid on the Performance of a Closed Loop Pulsating Heat Pipe

机译：工作流体表面张力变化对闭环脉动热管性能的影响

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摘要

In this article, the effect of surface tension variation of the working fluid on the thermal performance of a pulsating heat pipe (PHP) is presented. A two-turn closed loop PHP is fabricated with a combination of copper and quartz tubes having 2 mm inner diameter. Three filling ratios are considered in the present study. A common surfactant namely sodium dodecyl sulfate is used to vary the surface tension of the distilled water which is the base working fluid tested in the PHP. Visualization as well as heat transfer studies is performed in the PHP. Thermal resistances of working fluids with different surface tension are estimated for each filling ratio. Further, the effect of surfactant concentration on the hydrodynamics of the PHP is also discussed. Addition of surfactant induces formation of foam after the filling process and in some phase of PHP operation. It changes the flow regime boundaries and lowers the evaporator temperature under specific operating conditions. A flow regime map is also constructed for the present PHP. The working fluid with a lower surface tension gives a minimum evaporator temperature in the vertical orientation and thus, lowest thermal resistance has been obtained. However, surface tension does not influence the performance in the horizontal position appreciably.
机译：在本文中，提出了工作流体对脉动热管（PHP）的热性能的表面张力变化的影响。双转闭环PHP由具有2mm内径的铜和石英管的组合制造。在本研究中考虑了三个填充率。常见的表面活性剂即十二烷基硫酸钠用于改变蒸馏水的表面张力，其是在PHP中测试的基础工作流体。在PHP中进行可视化以及传热研究。为每个填充率估计具有不同表面张力的工作流体的热阻。此外，还讨论了表面活性剂浓度对PHP流体动力学的影响。添加表面活性剂在填充过程后诱导泡沫的形成，并在PHP操作的某些相中进行。它改变了流动调节边界，并在特定的操作条件下降低蒸发器温度。对于本PHP，还构造了流动制度图。具有较低表面张力的工作流体在垂直方向上给出最小蒸发器温度，因此获得了最低的热阻。然而，表面张力不会显着影响水平位置的性能。

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  • 来源
    《Heat Transfer Engineering》 |2019年第8期|509-523|共15页
  • 作者

    Kumar Manoj; Kant Ravi; Das Arup Kumar; Das Prasanta Kumar;

  • 作者单位

    Indian Inst Technol Kharagpur Dept Mech Engn Kharagpur 721302 W Bengal India;

    Indian Inst Technol Kharagpur Dept Mech Engn Kharagpur 721302 W Bengal India;

    Indian Inst Technol Roorkee Dept Mech & Ind Engn Roorkee Uttar Pradesh India;

    Indian Inst Technol Kharagpur Dept Mech Engn Kharagpur 721302 W Bengal India;

  • 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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