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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study of augmented flow boiling in a dielectric fluid due to backward and forward facing stepped microchannels
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Experimental study of augmented flow boiling in a dielectric fluid due to backward and forward facing stepped microchannels

机译：向后和向前的阶梯状微通道在介电流体中增加沸腾的实验研究

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This study explores the thermal performance of novel backward-facing-step and forward-facing-step structures in microchannel heat sinks. Tests are conducted at mass fluxes of 444-1776 kg/m(2) s and inlet subcoolings of 5-20 degrees C using FC-72 as the coolant. The effects of step change on boiling curve, flow pattern, pressure drop and heat transfer coefficient are discussed in this paper. The saw-toothed steps enhance the heat transfer performance by greater than 30% across the entire range of input parameters tested, with a peak enhancement of 100% at the highest mass flux. Pressure drop penalties range from 30% to 70% for the range of parameters tested. The forward-facing configuration leads to a larger bubble population in the channels, causing more effective mixing. These microchannel structures offer the promise of improved thermal performance without the complex fabrication processes associated with nanostructured or re-entrant geometries. (C) 2018 Elsevier Ltd. All rights reserved.
机译：这项研究探索了微通道散热器中新型后向和前向结构的热性能。使用FC-72作为冷却剂，在444-1776 kg / m（2）s的质量通量和5-20摄氏度的入口过冷度下进行测试。讨论了阶跃变化对沸腾曲线，流型，压降和传热系数的影响。锯齿状步骤在整个测试输入参数范围内将传热性能提高了30％以上，在最高质量通量下峰值提高了100％。对于所测试的参数范围，压降损失范围为30％至70％。朝前的配置导致通道中气泡的增加，从而导致更有效的混合。这些微通道结构提供了改善的热性能的希望，而无需与纳米结构或凹角几何形状相关的复杂制造过程。 （C）2018 Elsevier Ltd.保留所有权利。

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