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首页> 外文期刊>Journal of Heat Transfer >Investigation of Bubble Frequency for Slug Flow Regime in a Uniformly Heated Horizontal MicroChannel
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Investigation of Bubble Frequency for Slug Flow Regime in a Uniformly Heated Horizontal MicroChannel

机译：均匀加热水平微通道内弹状流态气泡频率的研究

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摘要

Slug flow is an essential flow pattern observed in microchannels where its transition boundaries in microchannels are characterized by two complex hydrodynamic phenomena, the bubble confinement and the bubble coalescence. Slug flow may be classified in terms of bubble size into two major zones: isolated bubble zone and coalescence bubble zone. In this paper, a semi-analytical model is developed for predicting the main characteristics of isolated bubble zone for flow boiling in a horizontal microchannel. The influences of surface tension, shear, and inertial forces have been taken into account. The model is developed on the basis of drift flux model, and a fully developed slug unit is chosen as a control volume for deriving the equations of motion. The effects of main operating conditions, mass and heat fluxes, on bubble length and bubble frequency have been investigated. The boundaries of slug flow regime have been identified based on the most proper diabatic flow pattern maps available in the literature for the chosen database. The model has been validated using the database available in the literature for flow boiling of R134a and R245fa in 0.509 mm and 3.0 mm inner diameter horizontal mini-tubes, respectively, and over wide range of mass fluxes (300 ≤G≤1000 kg/m~2 s). This study has shown that the mass flux has a significant effect on the slug length and the bubble frequency. The model gave a good agreement with the experimental data of bubble length and bubble frequency with a mean absolute error (MAE) of 18.0% and 27.34%, respectively.
机译：团状流是在微通道中观察到的必不可少的流型，其中在微通道中的过渡边界的特征在于两个复杂的流体动力学现象，即气泡约束和气泡聚结。团状流可以根据气泡大小分为两个主要区域：隔离气泡区域和聚结气泡区域。在本文中，建立了一个半分析模型，用于预测水平微通道中流动沸腾的孤立气泡区的主要特征。已经考虑了表面张力，剪切力和惯性力的影响。该模型是在漂移通量模型的基础上开发的，并选择了完全开发的弹头单元作为控制体积，以导出运动方程。研究了主要操作条件，质量和热通量对气泡长度和气泡频率的影响。基于文献中针对所选数据库的最合适的绝热流型图，已经确定了团状流态的边界。使用文献中可用的数据库对模型进行了验证，该模型可用于内径为0.509 mm和3.0 mm的水平微型管中的R134a和R245fa的流动沸腾，并可在较宽的质量通量范围内（300≤G≤1000kg / m 〜2 s）。这项研究表明，质量通量对段塞长度和气泡频率有重大影响。该模型与气泡长度和气泡频率的实验数据吻合良好，平均绝对误差（MAE）分别为18.0％和27.34％。

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