Discussion on the pressure drop calculation for oil-water separated flow using a one dimensional two-fluid model
Discussion on the pressure drop calculation for oil-water separated flow using a one dimensional two-fluid model
复制标题
一维二流体模型油水分离流压降计算探讨
DOI：
10.1002/cjce.23564
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发表时间：
2019
影响因子：
2.1
通讯作者：
Gong Jing
中科院分区：
文献类型：
--
作者：
Liu Nannan;Wang Wei;Liu Yingying;Ma Liang;Gong Jing
本文的目的是利用一维二流体模型寻找影响油水分离流压降计算的关键因素。总结了两流体模型的封闭关系，如界面结构、壁面和界面剪应力相关性。通过数值求解Young - Laplace方程建立界面构型，该方程与键数、接触角和持水率相关。结果表明：随着接触角的增大，界面由凹向凸转变，随着键数的增加，界面变为平坦；对于压降计算，曲线界面与平面界面的预测精度存在有限的差异。讨论了壁面摩擦系数和界面摩擦系数对压降计算的影响。与界面摩擦系数的影响相比，壁面摩擦系数的相关性贡献更大。我们利用8组已发表的实验结果验证了不同壁面摩擦因子的预测精度，并推荐了一种相关性，并将其进一步推广。
The purpose of this work is to seek the key factors influencing the pressure drop calculation for oil‐water separated flow using a one dimensional two‐fluid model. Closure relations published for the two‐fluid model such as interface configuration, wall, and interfacial shear stress correlations are summarized. Interface configurations are established by numerically solving the Young‐Laplace equation, correlated with the Bond number, contact angle, and water holdup. Results show that the interface transforms from concave to convex with the enlargement of the contact angle and becomes flat as the Bond number increases. For the pressure drop calculation, a limited difference of predicted accuracy between the curve and flat interface is found. Discussions of both the wall and interfacial friction factor correlation on the pressure drop calculation are performed. In contrast to the effect of the interfacial friction factor, the correlation of the wall friction factor is found to have more contributions. We validate the prediction accuracy of different wall frictions factors using eight groups of published experiment results, and one correlation is recommended and being further extended.