Study on Homogeneous Flow Model for Air-Water Two-Phase Flow in Mini-Rectangular Channel
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摘要: 在机玻璃竖直矩形通道内,以空气和去离子水为工质获得实验数据。据此对竖直矩形小通道内均相流模型的适用性进行评价。结果表明,采用McAdams两相粘度时均相流模型及Chen等提出的修正均相流模型能较好用于1.41 mm间隙通道压降的预测,平均绝对误差分别为10.92%和12.20%;采用McAdams两相粘度时均相流模型对于3 mm间隙通道在两相雷诺数Re大于6000时平均绝对误差为10.04%,但气-液两相Re较低时预测偏差较大。通过实验数据分析得到了均相流模型适用于3 mm间隙通道的范围;针对两相Re较低的区域拟合得到了新的经验关系式,其预测值与实验值符合较好。Abstract: The applicability of homogenous flow model to vertical mini-rectangular channel is evaluated by using air and de-ion water as the working fluid.The results show that the homogenous flow model with McAdams viscosity and the Chen modified homogeneous flow model could predict the pressure drop for the rectangular channel having the narrow gap of 1.41mm with the Mean Absolute Error(MAE) of 10.92% and 12.20%,respectively.The homogenous flow model with McAdams viscosity fails to predict the pressure drop for the channel having the gap of 3mm,except that the two-phase Reynolds number is greater than 6000 in which the MAE is 10.04%.The scale of homogenous flow model applied for rectangular duct having the narrow gap of 3mm is proposed by analyzing the experimental data.A new correlation is proposed for the channel with the gap of 3mm when the gas and liquid flow rate is low,and shows good agreement with the experimental data.
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Key words:
- Rectangular channel /
- Two-phase flow /
- Homogeneous flow model /
- Two-phase viscosity
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