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首页> 外文期刊>International Journal of Heat and Mass Transfer >Modeling of boiling flow in microchannels for nucleation characteristics and performance optimization
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Modeling of boiling flow in microchannels for nucleation characteristics and performance optimization

机译：微通道中沸腾流动的成核特性和性能优化建模

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The implementation of forced convective boiling in microchannels is developed to be very promising, as the attainable heat transfer rate is very favorable when compared to traditional thermal solutions. In this study, numerical simulations are conducted to investigate nucleate boiling in microchannels, with the interface separating liquid and vapor phases tracked by a conservative level set method (LSM). The behavior of bubbles in uniformly superheated liquid, and flow boiling regimes in a microchannel are identified to validate the applicability of the proposed methodology. Boiling mechanisms are found to be strongly dependant on wall surface conditions, simulations are thereby conducted to investigate flow boiling in microchannels with reentrant cavities. Comparisons of the performance of the enhanced and the plain-wall microchannels are performed, and the structured surfaces are demonstrated to facilitate nucleating and enhance critical heat flux (CHF). The identification and quantification of key design parameters of cavities including mouth opening (R), depth (H), diameter (D) and density are conducted, addressing an optimal topology design with R of 9.5 μm, H of 60 μm and D of 120 μm, which nucleates first under a given set of conditions from rather low superheating. To enable a compatible view, two cavity characteristic models are investigated. The stochastic model with randomly sized and located cavities has been proved to hinder the cooling capability by decreasing CHF, as compared to the deterministic model that comprises regular cavities. Nevertheless, it still outperforms the plain-wall microchannel. Finally, heat flux conditions of the cooling target are studied to seek high-performing cooling schemes, considering seven different heating loads.
机译：在微通道中强制对流沸腾的实现非常有前景，因为与传统的热解决方案相比，可获得的传热速率非常有利。在这项研究中，进行了数值模拟，以研究微通道中的核沸腾，其中界面通过保守的水平集方法（LSM）来分离液相和气相。确定了气泡在均匀过热液体中的行为以及微通道中的流动沸腾状态，以验证所提出方法的适用性。发现沸腾机理强烈依赖于壁表面条件，从而进行模拟以研究具有凹腔的微通道中的流动沸腾。进行了增强型和平壁微通道性能的比较，并证明了结构化表面有助于成核并增强了临界热通量（CHF）。进行了腔的关键设计参数的识别和量化，包括开口（R），深度（H），直径（D）和密度，从而解决了最佳拓扑设计，R为9.5μm，H为60μm，D为120 μm，在给定的一组条件下，由于过热程度较低，它首先会形核。为了获得兼容的视图，研究了两个腔特征模型。与包含规则型腔的确定性模型相比，具有随机尺寸和位置的型腔的随机模型已被证明通过降低CHF来阻碍冷却能力。但是，它仍然优于纯壁微通道。最后，研究了冷却目标的热通量条件，以考虑七个不同的热负荷，寻求高性能的冷却方案。

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