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首页> 外文会议>Fourth International Conference on Advanced Computational Methods in Heat Transfer held in Udine, Italy, in July 1996 >Characteristics of the entry flow field in an open thermosyphon
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Characteristics of the entry flow field in an open thermosyphon

机译：开放式热虹吸管中进入流场的特性

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摘要

Inthe present work we focus our attention on the inlet region of the thermosyphon tube, closed at the bottom and open at the top to a cold reservoir. It will be shown that the inlet flow characteristics play an important role, in the ability of the device to remove heat from the tube walls. A numerical simulation of the completerflow field, under turbulent conidtions, was conducted using the finite element methd. Verification of the simulated flow filed was obtained by visulization experiments in a scaled apparatus. It was found that under certain conditions the cold fluid from the reservoir does not penetrate into the tube's core. Actually an enhanced mixing heat transfer process takes place at the boundary between the tube and the reservoir, causing the upcoming hot fluid to cool down, and return back downward at the center of th tube. Such characteristics of the inlet flow field affects the efficiency of the thermosyphon as a cooling device.
机译：在当前的工作中，我们将注意力集中在热虹吸管的入口区域，该区域在底部关闭，在顶部打开至冷库。可以看出，入口流动特性在该装置从管壁带走热量的能力中起着重要的作用。使用有限元方法对湍流条件下的完全流动场进行了数值模拟。通过规模化设备中的可视化实验获得对模拟流场的验证。已经发现，在一定条件下，来自储层的冷流体不会渗透到管芯中。实际上，在管道和储层之间的边界处发生了增强的混合传热过程，使即将到来的热流体冷却下来，并在管道的中心向下返回。入口流场的这种特性影响热虹吸管作为冷却装置的效率。

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