Microscale Adiabatic Gas-Liquid Annular Two-Phase Flow: Analytical Model Description, Void Fraction, and Pressure Gradient Predictions

ANDREA CIONCOLINI; JOHN R. THOME; LORENZO CONSOLINI; CHIN LEE ONG

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Microscale Adiabatic Gas-Liquid Annular Two-Phase Flow: Analytical Model Description, Void Fraction, and Pressure Gradient Predictions

机译：微米级绝热气液环形两相流：分析模型说明，空隙率和压力梯度预测

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The study is devoted to the modeling of microscale adiabatic gas-liquid annular two-phase flow. The turbulent diffusion of momentum in the annular liquid film is assumed to be governed by the conditions near the channel wall, in analogy with single-phase turbulent bounded flow. This allows the universal velocity profile for single-phase turbulent flow to be extrapolated to the annular liquid film for the prediction of the local velocity. Conservation of mass applied to the liquid film allows the calculation of the average liquid film thickness, which in turn yields the void fraction. Once the void fraction is known, conventional one-dimensional, two-fluid modeling can be applied to predict all the relevant hydrodynamic parameters, an approach applied previously to macrochannel two-phase flow that in the present article is extended to microchannels. In the article, the analytical model is described and applied to an experimental database containing about 1100 data points for refrigerants R-134a and R245fa flowing through three horizontal circular glass microchannels of inner diameters 0.52 mm, 0.80 mm, and 1.0 mm, respectively. The database includes the pressure drop, mass flow rate, and vapor quality and covers operating pressures from 155 to 877 kPa, mass fluxes from 277 to 2026 kg m~(-1) s~(-1) and vapor qualities from 0.07 to 0.92. In particular, the analytical results regarding the void fraction are shown to compare favorably with macroscale empirical correlations extrapolated to microchannels, while the two-phase friction factor is successfully correlated using just one dimensionless flow parameter (defined as the ratio of a liquid film Reynolds number to a gas core Weber number), allowing a satisfactory prediction of the measured pressure gradients.

机译：该研究致力于微尺度绝热气液环形两相流的建模。假设环形液体薄膜中动量的湍流扩散受通道壁附近条件的控制，类似于单相湍流有界流。这允许将单相湍流的通用速度分布外推到环形液膜上，以预测局部速度。节省施加到液膜上的质量允许计算平均液膜厚度，这反过来产生空隙率。一旦知道了空隙率，便可以将常规的一维，双流体模型应用于预测所有相关的流体动力学参数，该方法先前已应用于宏通道两相流，在本文中已扩展为微通道。在本文中，描述了分析模型并将其应用于实验数据库，该数据库包含约1100个数据点，这些数据分别流经三个内径分别为0.52 mm，0.80 mm和1.0 mm的水平圆形玻璃微通道的R-134a和R245fa。该数据库包括压降，质量流量和蒸气质量，涵盖了从155至877 kPa的工作压力，从277至2026 kg m〜（-1）s〜（-1）的质量通量和从0.07至0.92的蒸气质量。尤其是，关于空隙率的分析结果显示出可与外推至微通道的宏观经验相关性良好地比较，而仅使用一个无量纲的流动参数（定义为液膜雷诺数的比率）就成功地将了两相摩擦系数进行了相关。气芯韦伯数），从而可以对测得的压力梯度进行令人满意的预测。

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来源
《Heat Transfer Engineering》 |2010年第4期|p.310-320|共11页
作者
ANDREA CIONCOLINI; JOHN R. THOME; LORENZO CONSOLINI; CHIN LEE ONG;
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作者单位

Heat and Mass Transfer Laboratory, Ecole Polytechnique Federate de Lausanne, Lausanne, Switzerland;

Heat and Mass Transfer Laboratory, Ecole Polytechnique Federale de Lausanne, EPFL-STI-IGM- LTCM, Station 9, 1015 Lausanne, Switzerland;

Heat and Mass Transfer Laboratory, Ecole Polytechnique Federate de Lausanne, Lausanne, Switzerland;

Heat and Mass Transfer Laboratory, Ecole Polytechnique Federate de Lausanne, Lausanne, Switzerland;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
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关键词
d: tube inner diameter, m; e: fraction of liquid entrained as droplets; f: Fanning friction factor, 2τ_(wall)/ρ~(V~2); G: mass flux, kg m~(-2) s~(-1); g: acceleration of gravity, m s~(-2); et al;

机译：d：管内径;m;e：夹带成液滴的液体分数;f：扇形摩擦系数;2τ_（壁）/ρ〜（V〜2）;G：质量通量;kg m〜（-2）s〜（-1）;g：重力加速度;m s〜（-2）;等;

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Microscale Adiabatic Gas-Liquid Annular Two-Phase Flow: Analytical Model Description, Void Fraction, and Pressure Gradient Predictions

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