Prediction Model for Pressure Drop of Single-Phase Flows in Porous Media Channel
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摘要: 与常规管通道相比较,流体在多孔介质通道中的流动过程更复杂,流动阻力也大幅增加,这就使得难以准确预测流体流过多孔介质通道时的压降。通过构建多孔介质通道的几何模型,并求解N-S方程,虽然可以准确预测阻力压降,但计算时需要划分大量的网格,很难广泛应用。本文在相似理论基础上,以Fluent 6.3为平台,建立了颗粒填充多孔介质通道的压降预测模型,通过求解3维N-S方程,对模型中单相水的绝热流动进行了数值模拟。通过与实验结果进行比较,证明该预测模型对于不同工况下单相流体的压降计算具有较高的计算精度,误差范围小于5%。Abstract: Compared with that in the conventional pipes,the fluid flow in porous media channels is more complicated and the flow resistance increases dramatically,which makes it difficult to predict the pressure drop exactly.The pressure drop can be predicted by developing the porous media channel model and solving N-S equation.But it can not be used widely,because of a great quantity meshes.In this paper,based on the similarity theory,a prediction model for pressure drop in porous media channels was developed using Flu-ent6.3.The adiabatic flow was numerically simulated by solving the three dimensional N-S equation.The comparison with the experiment results showed that the predictions agreed well with the measurement of various working conditions with an error less than 5 %.
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Key words:
- Similarity theory /
- Porous media /
- Numerical simulation /
- Prediction model
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