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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental tests of a stainless steel loop heat pipe with flat evaporator
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Experimental tests of a stainless steel loop heat pipe with flat evaporator

机译：带有平面蒸发器的不锈钢回路热管的实验测试

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摘要

This paper describes the experimental results showing the thermal characteristics of a loop heat pipe(LHP)with the evaporator in the shape of a flat disk having an active diameter of 50 mm and a thickness of 13 mm. The loop and the wick are made of stainless steel and water is used as working fluid. The system could be used for the thermal control of space application devices, and the goal of the experimental research was to improve and extend the knowledge in this field, adding the results to those obtained with these devices manufactured with different design, architecture and material. Tests carried out at horizontal elevation(orientation), in both configurations, that is with the evaporator below the compensation chamber(favourable)and with the evaporator above the compensation chamber(unfavourable), allow the analysis of the start-up reliability and the operational characteristics of the LHP in a wide range of heat loads. During the testing of the LHP under single step heat load, the thermal response presented by the loop to achieve steady-state is very long implying a long start-up time. With the evaporator above the compensation chamber(unfavourable), thermal and hydraulic oscillations are observed throughout the loop. The effect of these oscillations on the thermal performance of the LHP is not very significant. In the favourable configuration no oscillation occurs and the device is able to transfer a maximum heat load of 75W with the evaporator temperature below 150°C. The thermal resistance(R_(LHP))of the LHP, which is the resistance from the evaporator external surface to the condenser external surface(refrigerant water sink), lies between 3.33 and 50.7°C/W.
机译：本文描述了实验结果，该实验结果显示了带有蒸发器的环形热管（LHP）的热特性，该蒸发器为活动直径为50毫米，厚度为13毫米的平盘形。回路和灯芯由不锈钢制成，水用作工作流体。该系统可用于空间应用设备的热控制，实验研究的目的是改善和扩展该领域的知识，并将结果添加到采用不同设计，架构和材料制造的这些设备中。两种配置均在水平高度（方位）下进行，即蒸发器位于补偿室下方（有利）和蒸发器位于补偿室上方（不利），可以分析启动可靠性和运行状况。 LHP在各种热负荷下的特性。在单步热负荷下对LHP进行测试的过程中，环路呈现的达到稳态的热响应非常长，这意味着启动时间很长。当蒸发器位于补偿腔上方时（不利），在整个回路中都会观察到热振荡和液压振荡。这些振荡对LHP热性能的影响不是很明显。在有利的配置中，不会发生振荡，并且该设备能够在蒸发器温度低于150°C时传递75W的最大热负荷。 LHP的热阻（R_（LHP））是从蒸发器外表面到冷凝器外表面（制冷剂水槽）的电阻，介于3.33和50.7°C / W之间。

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