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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Annular liquid film thickness prediction in a vertical 180 degrees return bend
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Annular liquid film thickness prediction in a vertical 180 degrees return bend

机译：垂直180度的环形液体膜厚度预测返回弯曲

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Annular flow is predominant in gas wells. Liquid may be present in form of entrained droplets as well as in the liquid film on pipe wall. The knowledge of the average liquid film thickness is vital for detailed mechanistic modelling of churn-annular flow in engineering applications. So far, the models for liquid film thickness prediction are limited to vertical and horizontal pipes. These models were based on limited ranges of experimental data. In addition, exhaustive iterations are needed when these models are used to estimate liquid film thickness. In this work, a new correlation to predict liquid film thickness in a 180 degrees bend under gas-liquid annular conditions was successfully proposed. The correlation was based on dimensionless numbers (modified gas and liquid Weber numbers and gas Froude number) which reflect the underlined physics governing gas-liquid interaction in the bend. The Weber numbers capture the two important forces (inertial and surface tension forces) which govern the formation of the liquid film thickness within the system while gas Froude number quantifies the interaction of two important forces (centrifugal and gravitational forces) which determines the distribution of the phases across a bend. The proposed liquid film thickness correlation was based on the experimental data obtained from a wide range of operating conditions. The liquid superficial velocities ranges from 0.02 to 0.2 m/s and gas superficial velocities from 3.5 to 16 m/s at different measurement locations of 45 degrees, 90 degrees and 135 degrees of the bend with a diameter of 127 mm. The liquid film thickness in air-water and helium-water annular flow can be predicted by delta = 28.4061(We(L))(0.10318) (We(G))(-0.30954) (Fr-G)(-0.31423). The validation of the proposed correlation used to predict liquid film thickness in gas-liquid annular systems with different pipe diameters were examined against the available data in the literature. Good agreement was found between the
机译：环形流动在气井中是主要的。液体可以以夹带的液滴和管壁上的液体膜形式存在。平均液体膜厚度的知识对于工程应用中的搅拌环形流动的详细机械建模至关重要。到目前为止，液膜厚度预测的模型限于垂直和水平管。这些模型基于有限的实验数据范围。此外，当这些模型用于估计液体膜厚度时，需要详尽的迭代。在这项工作中，成功提出了一种新的相关性，以预测液体环形条件下的180度弯曲中的液体膜厚度。相关性基于反映弯曲中的气液相互作用的下划线物理学的无量纲数（改性气体和液体韦伯数量和气体FRouee号）。韦伯数捕获了两个重要的力（惯性和表面张力），该力量（惯性和表面张力）控制系统内的液体膜厚度的形成，而气体FRoude号码量化了两个重要力（离心和重力）的相互作用，这决定了确定的分布弯曲的阶段。所提出的液体膜厚度相关基于从各种操作条件获得的实验数据。液体表面速度在45度，90度和135度的不同测量位置的3.5至16m / s的0.02至0.2m / s，气体表面速度范围为0.02至0.2m / s，气体表面速度为直径为127mm。通过Delta = 28.4061（We（L））（0.10318）（0.30954）（FR-G）（-0.31423）（0.30954）（-0.31423）（0.10318）（0.3184）（-0.31423）（0.31423）（0.31423）（0.31423）（0.31423）（ - 0.31423）。针对文献中的可用数据检查用于预测具有不同管道直径的气液环形系统中的液体膜厚度的所提出的相关性。在...之间发现了良好的协议

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