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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow boiling instability characteristics in expanding silicon microgap heat sink
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Flow boiling instability characteristics in expanding silicon microgap heat sink

机译：扩展硅微间隙散热器中的流沸腾不稳定性特征

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摘要

The effects of mass flux, heat flux and microgap configuration on flow boiling instability in expanding microgap heat sink are experimentally investigated. Characterizations of instabilities are performed for deionized water mass fluxes, G = 400-1000 kg/m~2s, imposed effective heat flux q~″_(eff) ranging from 0 to 80 W/cm~2 for three different microgap configurations, straight microgap of depth 200 μm and expanding microgap having same inlet depth 200 μm with gradually increasing exit depth 300 μm and 460 μm. High speed flow visualizations are conducted simultaneously along with experiments to explore the bubble behavior in expanding microgap heat sink. Results show that two phase expanding microgap heat sink has novel potential to mitigate the flow instabilities and flow reversal issues as the generated vapor has room to expand downstream and also due to reducing shear force along the direction of expansion. Reduced share force is beneficial as it contributes to easing flow in the direction of expansion and thus, eliminates flow reversal and maintains stable flow boiling condition. In addition, inlet pressure oscillation increases gradually with the increase of mass flux and heat flux due to the extensive repetitive backward expansion of vapor slug. Whereas, wall temperature oscillation decreases with the decrease of mass flux and increase of heat flux due to the presence of stable annular flow regime at high heat flux and low mass flux condition before dryout approaches.
机译：实验研究了质量通量，热通量和微间隙构型对扩展的微间隙散热器中流动沸腾不稳定性的影响。对于去离子水质量通量，G = 400-1000 kg / m〜2s，对三种不同的微间隙结构，施加的有效热通量q〜''_（eff）在0至80 W / cm〜2的范围内，进行不稳定性表征深度为200μm的微间隙，具有相同入口深度200μm的扩展微间隙，出口深度300μm和460μm逐渐增加。高速流动可视化与实验同时进行，以探索膨胀微间隙散热器中的气泡行为。结果表明，两相膨胀微间隙散热器具有新颖的潜力来缓解流动不稳定性和流动逆向问题，因为产生的蒸气具有向下游膨胀的空间，也归因于沿膨胀方向的剪切力减小。减小的分力是有益的，因为它有助于缓和膨胀方向上的流动，从而消除了流动的逆转并保持了稳定的流动沸腾状态。此外，由于蒸汽团块反复向后膨胀，入口压力振荡随着质量通量和热通量的增加而逐渐增加。然而，壁温振荡随着质量通量的减少和热通量的增加而减小，这是由于在变干前在高热通量和低质量通量条件下存在稳定的环形流动状态所致。

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