Visual Observation and Analytical Study of the Heat Load Sharing Mode in Multi-Evaporator Loop Heat Pipe

IF 2.8 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-08-11 DOI:10.1115/1.4063153

Masafumi Kizawa, N. Watanabe, A. Ueno, X. Chang, H. Nagano

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Abstract

In this paper, the operating characteristics of the heat load sharing mode of multiple-evaporator loop heat pipe (MLHP) were elucidated based on a visual observation test. The heat load sharing mode is a function of MLHPs that can share the heat between the evaporators through the vapor without electronic power for the heat storage utilization. A visualized MLHP with two evaporators and one condenser was designed and fabricated. To simulate the heat load sharing mode in the MLHP, one evaporator was heated in the range of 40-280 W and the other evaporator was cooled using a water jacket in the range of 10-80 °C. Under the heat load sharing mode, the flow behaviors in the evaporator cores and the compensation chambers (CCs) were visually observed using borescope cameras, respectively. Moreover, two operating modes (defined as Mode A and Mode B) that affect the maximum heat sharing capability were identified. In Mode A, the heat sharing rate was proportional to the heat dissipation at the cooled side of evaporator, where the capillary force at the wick significantly affect the operation mode. By contrast, in Mode B the heat sharing rate reached the upper limit and then was constant regardless of the heat dissipation. Furthermore, the proposed concept model can predict the transition of the operation mode from Mode A to Mode B.

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多蒸发器环路热管热负荷分担方式的可视化观察与分析研究

通过目测试验，阐述了多蒸发器环路热管(MLHP)热负荷分担方式的运行特性。热负荷分担模式是MLHPs的一种功能，它可以通过无电子电源的蒸汽在蒸发器之间分担热量，以实现蓄热利用。设计并制作了一个具有两个蒸发器和一个冷凝器的可视化MLHP。为了模拟MLHP的热负荷分担模式，在40-280 W范围内加热一台蒸发器，在10-80℃范围内使用水套冷却另一台蒸发器。在热负荷分担模式下，利用内窥镜相机分别观察了蒸发器堆芯和补偿室的流动行为。此外，确定了影响最大热共享能力的两种工作模式(定义为模式A和模式B)。在模式A中，热分担率与蒸发器冷却侧的散热成正比，其中芯处的毛细力对运行方式影响较大。相比之下，在模式B中，无论散热如何，热分担率都达到上限，然后保持不变。此外，所提出的概念模型可以预测运营模式从A模式到B模式的转变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Heat Transfer-transactions of The Asme 工程技术-工程：机械

自引率

0.00%

发文量

182

审稿时长

4.7 months

期刊介绍： Topical areas including, but not limited to: Biological heat and mass transfer; Combustion and reactive flows; Conduction; Electronic and photonic cooling; Evaporation, boiling, and condensation; Experimental techniques; Forced convection; Heat exchanger fundamentals; Heat transfer enhancement; Combined heat and mass transfer; Heat transfer in manufacturing; Jets, wakes, and impingement cooling; Melting and solidification; Microscale and nanoscale heat and mass transfer; Natural and mixed convection; Porous media; Radiative heat transfer; Thermal systems; Two-phase flow and heat transfer. Such topical areas may be seen in: Aerospace; The environment; Gas turbines; Biotechnology; Electronic and photonic processes and equipment; Energy systems, Fire and combustion, heat pipes, manufacturing and materials processing, low temperature and arctic region heat transfer; Refrigeration and air conditioning; Homeland security systems; Multi-phase processes; Microscale and nanoscale devices and processes.