Gas-Assisted Thin-Film Evaporation from Confined Spaces for Dissipation of High Heat Fluxes
Gas-Assisted Thin-Film Evaporation from Confined Spaces for Dissipation of High Heat Fluxes
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DOI：
10.1080/15567260802625908
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发表时间：
2009-02
影响因子：
4.1
通讯作者：
S. Narayanan;A. Fedorov;Y. Joshi
中科院分区：
文献类型：
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作者：
S. Narayanan;A. Fedorov;Y. Joshi
一种新的冷却方案，利用蒸发从一个巨大的，空间受限的液体膜的热管理与局部热通量超过600 W/cm 2的热点进行了描述和分析。这是通过在表面上保持稳定的单层液体并使用完全干燥的吹扫气体（例如，空气）以高速（50-100 m/s）吹到该液体单层上方。我们还演示了如何介电冷却剂，如FC 72可以优于水作为蒸发冷却剂，这个计划。这项工作提出了概念系统的设计，性能分析的结果支持所提出的冷却方案的可行性，以及实验结果，证明了这一想法，以及验证计算结果。分析允许一个阐明的显着的物理特征的蒸发冷却从空间受限的薄膜进行吹扫气体，并确定的关键参数，从而提高性能。简化模型以适合于设计利用所提出的冷却方案的独特优势的全尺寸冷却装置（汗液纳米贴片）的形式提供结果。
A new cooling scheme utilizing evaporation from an ultrathin, spatially confined liquid film is described and analyzed for thermal management of hot spots with local heat fluxes in excess of 600 W/cm2. This is achieved by a stable monolayer of liquid maintained on the surface and using fully dry sweeping gas (e.g., air) blown at high velocity (50–100 m/s) above this liquid monolayer. We also demonstrate how dielectric coolants like FC72 can outperform water as an evaporative coolant for this scheme. This work presents the conceptual system design, the results of performance analysis supporting the feasibility of the proposed cooling scheme, and experimental results that demonstrate the idea as well as validate the computational results. The analysis allows one to elucidate the salient physical features of evaporative cooling from spatially confined thin films subjected to a sweeping gas and to identify the key parameters resulting enhanced performance. The simplified model provides results in a form suitable for designing a full-scale cooling device (perspiration nanopatch) that exploits the unique advantages of the proposed cooling scheme.