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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 >Thermal-fluidic transport characteristics of bi-porous wicks for potential loop heat pipe systems
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Thermal-fluidic transport characteristics of bi-porous wicks for potential loop heat pipe systems

机译：用于潜在环热管系统的双多孔芯的热流体传输特性

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摘要

With the miniaturization of electronic components, thermal management of electronic devices and systems becomes a crucial problem. A Loop Heat Pipe (LHP) is a promising solution for many contemporary and future thermal management problems. A LHP is a passive, flexible and robust two-phase heat transfer device which utilizes the latent heat of phase-change to transfer heat and the capillary force generated by porous wick to circulate the working fluid. The porous wick is the heart of LHP which strongly controls its thermal performance. The main aim of the present research is to develop a bi-porous wick and analyze its thermal performance. Bi-porous copper wicks are fabricated with cold press sintering using naphthalene as the pore former. The effect of pore former content and sintering temperature on porous characteristics has been studied. It is observed that porosity and permeability increase with an increase in pore former content and decreases with increase in sintering temperature. The local heat transfer characteristic of the porous wick is studied using Infrared Thermography. Both infrared thermography and digital videography show that the liquid-vapor interface in the porous wick moves away from the heated fin as heat load increases. A change in slope of temperature profile in the porous wick is observed at the liquid-vapor interface. The evaporative heat transfer coefficient at fin-wick interface decreases with increase in heat load.
机译：随着电子元件的小型化，电子设备和系统的热管理成为一个至关重要的问题。环路热管（LHP）是许多当代和未来热管理问题的有希望的解决方案。 LHP是一种被动，柔性且坚固的两相传热装置，其利用相变的潜热，以传递热量和多孔芯产生的毛细管力以循环工作流体。多孔芯是LHP的心脏，它强烈控制其热性能。本研究的主要目的是开发一种双多孔芯并分析其热性能。双多孔铜芯用冷压烧结使用，使用萘作为孔前甲苯。研究了孔隙以前含量和烧结温度对多孔特性的影响。观察到孔隙率和渗透性随着孔前含量的增加而增加，并且随着烧结温度的增加而降低。使用红外热成像研究多孔芯的局部传热特性。两种红外热成像和数字式摄像机都显示多孔芯中的液态蒸汽接口远离加热的翅片随着热负荷的增加而移动。在液态蒸汽界面处观察到多孔芯中温度曲线斜率的变化。翅片界面的蒸发传热系数随热负荷的增加而降低。

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