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首页> 外文期刊>International Journal of Heat and Mass Transfer >A comparative study of flow boiling heat transfer and pressure drop characteristics in microgap and microchannel heat sink and an evaluation of microgap heat sink for hotspot mitigation
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A comparative study of flow boiling heat transfer and pressure drop characteristics in microgap and microchannel heat sink and an evaluation of microgap heat sink for hotspot mitigation

机译：微间隙和微通道散热器中流沸腾传热和压降特性的比较研究以及缓解热点的微间隙散热器评估

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摘要

Two phase microgap heat sink has a large potential to minimize the drawbacks associated with two phase microchannel heat sink, especially flow instabilities, flow reversal and lateral variation of flow and wall temperature between channels. This new concept of the two-phase microgap heat sink is very promising due to its high heat transfer rate and ease of fabrication. However, comparison of the performance of microgap heat sink (heat transfer, pressure drop and instability characteristics) with some conventional heat sink has not been investigated extensively. In this study, experiments have been conducted to investigate the heat transfer and pressure drop characteristics of deionized water (DI) in microgap heat sink and compare these experimental results with similar data obtained for microchannel heat sink. These studies are carried out with the inlet DI water temperatures 86 ℃ at different mass fluxes ranging from 400 to 1000 kg/m~2 s, for effective heat flux 0-85 W/cm~2. High speed flow visualizations are conducted simultaneously along with experiments to illustrate the bubble characteristics in the microchannel and microgap heat sink. Experimental result shows that microgap heat sink performs better at high heat flux and low mass flux due to confined slug and annular boiling dominance and consequent delay of dryout phase. So, this microgap technology is promising and an effective method to dissipate very high heat fluxes in compact space with a smaller rate of coolant flow. Moreover, pressure drop is higher in microchannel than microgap heat sink at all the heat fluxes. In addition, encouraging results have been obtained using microgap as it can potentially mitigate local hotspot, reduce flow instabilities, flow reversal and maintain uniform wall temperatures over the heated surface.
机译：两相微间隙散热器具有很大的潜力，可以最大程度地减少与两相微通道散热器相关的缺点，尤其是流量不稳定性，流量反转以及通道之间的流量和壁温横向变化。两相微间隙散热器的这一新概念因其高传热率和易于制造而非常有前途。然而，尚未对微间隙散热器的性能（传热，压降和不稳定性）与某些常规散热器进行比较。在这项研究中，已进行实验以研究微间隙散热器中去离子水（DI）的传热和压降特性，并将这些实验结果与微通道散热器获得的类似数据进行比较。这些研究是在入口去离子水温度为86℃，质量通量范围为400至1000 kg / m〜2 s的情况下进行的，有效热通量为0-85 W / cm〜2。高速流动可视化与实验同时进行，以说明微通道和微间隙散热器中的气泡特征。实验结果表明，由于有限的团块和环状沸腾优势以及随之而来的干燥阶段的延迟，微间隙散热器在高热通量和低质量通量下表现更好。因此，这种微间隙技术是有前途的，并且是一种有效的方法，可以在致密空间中以较小的冷却剂流量散发很高的热通量。此外，在所有热通量下，微通道中的压降均高于微间隙散热器。另外，使用微间隙已经获得了令人鼓舞的结果，因为它可以缓解局部热点，减少流动不稳定性，逆流并在受热表面上保持均匀的壁温。

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  • 作者

    Tamanna Alam; Poh Seng Lee; Christopher R. Yap; Liwen Jin;

  • 作者单位

    Thermal Process Lab 2, Department of Mechanical Engineering, National University of Singapore, Engineering Drive 1, Singapore 117576, Singapore;

    Thermal Process Lab 2, Department of Mechanical Engineering, National University of Singapore, Engineering Drive 1, Singapore 117576, Singapore;

    Thermal Process Lab 2, Department of Mechanical Engineering, National University of Singapore, Engineering Drive 1, Singapore 117576, Singapore;

    Thermal Process Lab 2, Department of Mechanical Engineering, National University of Singapore, Engineering Drive 1, Singapore 117576, Singapore;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Microgap heat sink; MicroChannel heat sink; Local hotspot; Pressure instability; Flow visualization;

    机译：微间隙散热器;微通道散热器;当地热点;压力不稳定;流程可视化;

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