Investigation on the Effects of Body Force Environment on Flat Heat Pipes
Investigation on the Effects of Body Force Environment on Flat Heat Pipes
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DOI：
10.2514/2.6640
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发表时间：
2001-10
影响因子：
2.1
通讯作者：
Mohamed Chaker Zaghdoudi-;C. Sarno
中科院分区：
文献类型：
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作者：
Mohamed Chaker Zaghdoudi-;C. Sarno
本文报道的体积力环境的影响：重力，振动，和加速度的力量，使用恒定的热负荷的热性能的平板铜/水热管。重力的影响进行了研究，通过测试热管在不同的位置：水平，垂直与热源向上（反重力位置），和垂直与热源向下（热虹吸位置）。分别使用离心机和振动台产生瞬态加速度和振动，以模拟与飞机在频率、振幅、持续时间和方向上的机动相对应的振动和加速度力。实验结果表明，当输入热功率小于20 W时，无论倾斜角度如何变化，热管的热性能几乎不受重力的影响。对于高于20 W的输入热功率，热管热性能对重力有轻微的依赖性。对于振动测试，热管安装在三轴振动台上，并受到正弦激励。无论热管在振动台上的安装方向如何，热管的热性能几乎不受振动的影响。研究了恒定输入热负荷下瞬态加速力对热管热性能的影响。多余的工作流体的汇集在受到加速的热管的热传输潜力中起着重要的作用。随着加速的增加，热管的热性能会降低，这是由于蒸发器部分变干和冷凝器部分的汇集。干燥，这是证明作为一个结果，增加加速度，取决于输入热功率和加速类型。然而，在某些加速测试下，热管成功地重新启动，抑制了加速。在所有情况下，热管热阻的增加不超过70%。在10-g加速度水平下获得的最大热管热阻对于电子封装安全性来说仍然是可接受的值。
This paper reports on the effects of body forces environment: gravitation, vibration, and acceleration forces using constant heat load on the thermal performance of a flat copper/water heat pipe. The effect of gravitation forces is studied by testing the heat pipe in different positions: horizontal, vertical with a heat source upwards (antigravity position), and vertical with a heat source downward (thermosyphon position). Transient accelerations and vibrations are generated using centrifuge and shaking tables, respectively, in order to simulate vibration and acceleration forces corresponding to aircraft maneuvering in frequency, amplitude, duration, and direction. The experimental results on the orientation effects show that the heat pipe is hardly affected by the gravitation forces and exhibits nearly the same thermal performance whatever the tilt angle for input heat powers lower than 20 W. For input heat powers higher than 20 W, there is a slight heat pipe thermal performance dependency on gravitation. For the vibration tests the heat pipe is mounted on a tri-axis shaking table and it is subjected to sinusoidal excitation. The heat-pipe thermal performance is hardly affected by vibration whatever the mounting direction on the shaking table. An investigation into the effects of transient acceleration forces with constant input heat loads on the heat-pipe thermal performance has been conducted. Pooling of the excess working fluid plays a significant role in the heat transport potential of the heat pipe subjected to accelerations. There is a decrease in the heat-pipe thermal performance with increasing acceleration as a result of partial dryout of the evaporator and pooling in the condenser section. Dryout, which is demonstrated as a result of increased acceleration, depends on the input heat power and the acceleration type. However, under certain acceleration tests the heat pipe successfully reprimed with a suppression of acceleration. In all cases the increase of the heat-pipe thermal resistance does not exceed 70%. The maximum heat-pipe thermal resistance obtained under 10-g acceleration level remains an acceptable value for the electronic package safety.