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首页> 外文会议>American Society of Mechanical Engineers(ASME) Heat Transfer/Fluids Engineering Summer Conference 2004(HT/FED 2004) vol.3; 20040711-15; Charlotte,NC(US) >EFFECT OF FLOW ORIENTATION ON CRITICAL HEAT FLUX IN SUBCOOLED FLOW BOILING
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EFFECT OF FLOW ORIENTATION ON CRITICAL HEAT FLUX IN SUBCOOLED FLOW BOILING

机译：流动方向对过冷沸腾沸腾临界热流的影响

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摘要

Recent work has demonstrated that as the bulk convective velocity in subcooled nucleate flow boiling increases, the heat transfer tends to become independent of flow orientation with respect to gravity. There is significant interest in developing heat exchangers for next generation spacecraft that operate in the gravity-independent flow boiling regime. In order to develop such heat exchangers it is important to understand the effect of gravity on the critical heat flux and to determine whether a gravity-independent flow boiling critical heat flux regime exists. This work describes subcooled flow boiling experiments where the critical heat flux is measured over a range of flow orientations with respect to gravity: 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°. It has been found that at low bulk flow velocities there is a large variation of critical heat flux with different flow orientations. At large convective velocities, the variation of critical heat flux with different flow orientations is significantly diminished. It appears that with further increases in bulk flow velocity, a gravity-independent critical heat flux regime exists, although the current experimental facility was not capable of operating at those flow conditions.
机译：最近的工作表明，随着过冷核流沸腾中整体对流速度的增加，传热趋于变得独立于流相对于重力的方向。开发用于下一代航天器的热交换器的兴趣很大，该热交换器以与重力无关的流动沸腾状态工作。为了开发这样的热交换器，重要的是要了解重力对临界热通量的影响，并确定是否存在不依赖重力的流动沸腾临界热通量状态。这项工作描述了过冷的流动沸腾实验，其中在相对于重力的流动方向范围内测量临界热通量：0°，45°，90°，135°，180°，225°，270°和315°。已经发现，在低整体流动速度下，具有不同流动方向的临界热通量有很大的变化。在大对流速度下，具有不同流向的临界热通量的变化将大大减小。似乎随着整体流速的进一步提高，存在着重力无关的临界热通量状态，尽管当前的实验设备无法在这些流动条件下运行。

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