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首页> 外文期刊>Journal of Heat Transfer >Visualization of an Oscillating Heat Pipe with Hydraulic Diameter Far Exceeding the Conventional Maximum Hydraulic Diameter
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Visualization of an Oscillating Heat Pipe with Hydraulic Diameter Far Exceeding the Conventional Maximum Hydraulic Diameter

机译：液压直径远超过常规最大液压直径的振荡热管的可视化

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摘要

For an oscillating heat pipe (OHP), the hydraulic diameter must be sufficiently small so that vapor plug and liquid slug can be formed by the capillary action. Therefore, the hydraulic diameter should not exceed a critical value named maximum hydraulic diameter (MHD). In the current research, a glass OHP with a hydraulic diameter of 6 mm was fabricated, and ethanol was used as the working fluid (Figs. 1 and 2). With a hydraulic diameter far exceeding the maximum hydraulic diameter (MHD) defined by d_(h,max) ≤ {2σBo /[ ( ρ_l -ρ_v)g]}~(1/2) , the OHP can function. But the flow pattern is very different from that with a diameter smaller than the MHD, and depends on the filling ratio. When the OHP is charged with a higher filling ratio, the flow pattern is from the bubbly flow to the slug flow as shown in Fig, 3. When the charging ratio is low, the dispersed bubbly flow with many small bubbles generated on the surface was observed, and the dispersed bubbly flow was directly transformed into the annular flow as shown in Fig. 4.
机译：对于振荡热管（OHP），水力直径必须足够小，以便可以通过毛细作用形成蒸气塞和液塞。因此，液压直径不应超过称为最大液压直径（MHD）的临界值。在当前的研究中，制造了水力直径为6 mm的玻璃OHP，并使用乙醇作为工作流体（图1和2）。当水力直径远远超过d_（h，max）≤{2σBo/ [（ρ_l-ρ_v）g]}〜（1/2）定义的最大水力直径（MHD）时，OHP可以发挥作用。但是，流型与直径小于MHD的流型有很大不同，并且取决于填充率。当OHP填充率较高时，如图3所示，其流动方式是从气泡流向团状流。当填充率低时，表面上会产生许多小气泡的分散气泡流为如图4所示，分散的气泡流直接转化为环形流。

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  • 来源
    《Journal of Heat Transfer》 |2020年第3期|030906.1-030906.1|共1页
  • 作者

    Yulong Ji; Lilin Chu; Chunrong Yu; Zongyu Wang; Hongbin Ma;

  • 作者单位

    Marine Engineering College Dalian Maritime University Dalian Liaoning China;

    Department of Mechanical & Aerospace Engineering University of Missouri Columbia MO USA;

  • 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
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