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A performance comparison between water and IAS-charged thermosyphons.

机译：水和带IAS的热虹吸管之间的性能比较。

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摘要

An inorganic aqueous solution (IAS) has recently become a topic of interest among thermal engineers. The fluid has been used to reportedly charge so-called "Qu tubes", and has demonstrated high heat transport capability in capillary wicks in comparison to water. It has also shown promise as an aluminum compatible aqueous solution. This study measures the axial heat flux of 10 ft. long, 5/16 in. diameter water and IAS-charged thermosyphons in a forced convection apparatus at heater inputs of 300W, 450W, 600W, and 700W. The performance of the thermosyphons was measured at angles of 35, 25, and 15 degrees from horizontal for power levels up to 600W. The performance was measured at an angle of 35 degrees from horizontal for a heater input of 700W. An air calorimeter was used to quantify the condenser-end heat rate of the tubes. The performance was also measured with the heater temperature in conjunction with a power-loss curve that was determined by experiment. The water and IAS-filled tubes displayed equivalent performance up to a supplied power of 450W. The IAS-filled tube showed signs of dryout at 600W, while the water-filled tube achieved steady-state operation up to a heater input of 700W. An overall axial heat flux of 1276.5 W/cm2 was obtained for a heater input of 700W for the water thermosyphon. Internal axial grooves internal to the water-filled tube may have contributed to its performance at higher temperatures. The axial heat fluxes for both tubes fall well below analytical predictions of numerous closed-form thermosyphon limiting equations.
机译：无机水溶液（IAS）最近已成为热工程师关注的话题。据报道，该流体已用于给所谓的“ Qu管”充电，并且与水相比，已证明在毛细管芯中具有很高的传热能力。它还显示出与铝相容的水溶液的前景。这项研究在加热器输入为300W，450W，600W和700W的强制对流设备中，测量了10英尺长，直径5/16英寸的水和带IAS的热虹吸管的轴向热通量。在功率水平高达600W的情况下，以与水平方向成35、25和15度的角度测量了热虹吸管的性能。对于700W的加热器输入，以与水平线成35度的角度测量性能。空气热量计用于量化管子的冷凝器端的热速率。还通过加热器温度以及通过实验确定的功率损耗曲线来测量性能。装有水和IAS的灯管在提供450W功率时显示出相同的性能。充满IAS的灯管在600W时显示出变干的迹象，而充满水的灯管达到稳态输入功率达到700W。对于水热虹吸管的700W加热器输入，获得的总轴向热通量为1276.5 W / cm2。充水管内部的内部轴向凹槽可能有助于其在较高温度下的性能。两根管子的轴向热通量都大大低于许多闭式热虹吸极限方程的分析预测。

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  • 作者

    Cooke, Stephen D.;

  • 作者单位

    The University of Alabama in Huntsville.;

  • 授予单位 The University of Alabama in Huntsville.;
  • 学科 Engineering Aerospace.;Engineering Mechanical.
  • 学位 M.S.E.
  • 年度 2012
  • 页码 78 p.
  • 总页数 78
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TS97-4;
  • 关键词

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