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Correlations for two-phase friction pressure drop under microgravity

机译：微重力作用下两相摩擦压降的相关性

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摘要

The determination of two-phase friction pressure drop (TPFPD) in tubes is required by two-phase systems operating under microgravity. However, there is no proper TPFPD correlation for microgravity or reduced gravity, and thus people have to use a TPFPD correlation for normal gravity to estimate TPFPD under microgravity. This paper proposes a TPFPD correlation for microgravity, for which an up-to-data survey of the TPFPD experimental data under microgravity is carried out and a critical review of the published literature regarding TPFPD methods is conducted. Totally, 593 useful experimental data points under microgravity are obtained from 10 references, including 15 with GN_2-water, 256 with air-water, and 322 with R-12. These data are used to evaluate the existing TPFPD correlations and develop the new TPFPD correlation for microgravity. The new TPFPD correlation is the first TPFPD correlation specifically for microgravity with wide application range. The comparison shows that for microgravity applications it is far better than any existing model. It has a mean absolute relative deviation (MARD) of 20.4% with 56.7% of the sample having a relative deviation within ±15%, while the best existing model has the MARD of 25.3% with only 33.4% of the sample having the relative deviation within ±15%.
机译：在微重力下运行的两相系统需要确定管中的两相摩擦压降（TPFPD）。但是，对于微重力或减小的重力，没有适当的TPFPD相关性，因此人们必须使用法向重力的TPFPD相关性来估算微重力下的TPFPD。本文提出了一种用于微重力的TPPFD相关性，为此对微重力下的TPPFD实验数据进行了最新数据调查，并对有关TPPFD方法的公开文献进行了严格的综述。从10个参考文献中总共获得593个微重力下有用的实验数据点，包括15个GN_2-水，256个空气-水和322个R-12。这些数据用于评估现有的TPFPD相关性，并为微重力开发新的TPFPD相关性。新的TPFPD相关性是第一个专门针对具有广泛应用范围的微重力的TPFPD相关性。比较表明，对于微重力应用，它远胜于任何现有模型。它的平均绝对相对偏差（MARD）为20.4％，其中56.7％的样品的相对偏差在±15％以内，而最佳的现有模型的MARD为25.3％，只有33.4％的样品的相对偏差。在±15％之内。

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