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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical analysis on the thermal hydraulic performance of a composite porous vapor chamber with uniform radial grooves
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Numerical analysis on the thermal hydraulic performance of a composite porous vapor chamber with uniform radial grooves

机译：具有均匀径向槽的复合多孔蒸汽室热工水力性能的数值分析

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Composite porous vapor chamber (CPVC) with good thermal performance in temperature uniformity and high heat-flux limit was recently developed, and its wick structure consisted of a condenser wick and an evaporator wick with uniform radial grooves. However, the underlying mass and heat transfer mechanisms of the CPVC are unclear, hindering its further development. A simplified numerical model is presented in this paper to study the thermal hydraulic performance of the CPVC. By analyzing of the thermal performance, liquid/vapor velocity and pressure distributions of the CPVC with the input heat flux of 6 x 10(5)-28 x 10(5) W/m(2), the influence of the wick structures, the wick porosity configuration and the powder size on the thermal hydraulic performance of the CPVC is investigated. Results show that the wicks can provide radial multi-artery channels for liquid backflow and heat conductive passages for heat transfer. The wick porosity affects the performance of the CPVC more than the powder size does. To obtain better performance, the configuration of the evaporator wick porosity and the condenser wick porosity should make the maximum pressure drop in the wicks slightly less than the maximum capillary pressure. However, the optimal porosity configuration varies with the powder size. Larger powder size results into smaller optimal porosity, and vice versa. In addition, the wick porosities should be as close as possible to the lower bound of their range. To facilitate the fluid flowing through the multi-artery channels, the evaporator wick porosity should be slightly larger than the condenser wick porosity. The work is useful for optimizing CPVC. (C) 2019 Elsevier Ltd. All rights reserved.
机译：最近开发了在温度均匀性和高热通量限制条件下具有良好热性能的复合多孔蒸气室（CPVC），其芯结构由冷凝器芯和蒸发器芯组成，并具有均匀的径向凹槽。但是，CPVC的潜在质量和传热机理尚不清楚，从而阻碍了其进一步发展。本文提出了一个简化的数值模型来研究CPVC的热工水力性能。通过分析在输入热通量为6 x 10（5）-28 x 10（5）W / m（2）的情况下CPVC的热性能，液体/蒸气速度和压力分布，以及灯芯结构的影响，研究了灯芯的孔隙结构和粉末尺寸对CPVC热工水力性能的影响。结果表明，灯芯可提供径向的多动脉通道以用于液体回流，并提供导热通道以进行热传递。灯芯孔隙度对CPVC性能的影响大于粉末尺寸。为了获得更好的性能，蒸发器芯的孔隙率和冷凝器芯的孔隙率的配置应使芯中的最大压降略小于最大毛细管压力。然而，最佳的孔隙率配置随粉末尺寸而变化。较大的粉末尺寸导致较小的最佳孔隙率，反之亦然。此外，油芯孔隙率应尽可能接近其范围的下限。为了促进流体流过多动脉通道，蒸发器芯的孔隙率应略大于冷凝器芯的孔隙率。这项工作对于优化CPVC很有用。 （C）2019 Elsevier Ltd.保留所有权利。

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