气体/高黏液体两相间歇流动时液相含率的变化特性研究

为了准确地了解两相流动过程中相含率的变化情况从而实现监测长距离管道混输中的流态转化、流量波动以及压力脉动等,本研究基于实验数据研究了垂直管、水平管、倾斜管中气体/高黏液体两相间歇流动时液相含率的变化特性。研究结果揭示了水平、垂直和倾斜管路中液相含率的影响因素(包括黏度、倾斜角度、混合雷诺数和弗汝德数等)和变化趋势。同时提出了液相含率预测模型。误差分析表明,模型预测结果与实验测试数据较为一致。该研究对油气混输中的安全监控和保障具有重要意义

导流片型旋流场内油滴聚并影响因素研究

导流片型旋流器具有体积小、重量轻、效率高等优点，适用于井下以及海上平台等空间有限的场所。本文通过实验和数值模拟研究了导流片型旋流场中流量、油水界面张力、油相含率、油相粘度、油相粒度等因素对于离散相油滴聚并的影响。研究结果表明：随着流量增加，油滴聚并效果先增加后下降，当流量介于14m3/h~16m3/h之间时，可以使油滴聚并达到最佳的效果；提高油相含率能够增加大油滴的比例，同时也增加了小油滴的数量，因此在进行油水分离时排出的水相中会残留较多的油相；提高入口油相粒度和降低油相粘度，可以促进油滴的聚并；增大油水界面张力可以减小油滴破碎的概率，提高油水分离效率。这些研究结果对于导流片型旋流器的设计能起到一定的指导作用。</p

气体/高黏液体两相间歇流动时液相含率的变化特性研究

准确地获取气液流动过程中相含率的变化,可以帮助监测长距离混输管道中的流态转化、流量波动以及压力脉动等.该文基于不同工况下的实验数据研究了水平及倾斜管中气体/高黏液体两相间歇流动时液相含率的变化特性.研究结果揭示了水平、垂直和倾斜管路中液相含率的影响因素,即黏度、倾斜角度、混合雷诺数和弗劳德数等.同时,发展了一种无量纲指数形式的相含率预测模型,误差分析表明模型预测结果与实验测试数据较为一致

Wall Slip and Flow Characteristics of Gas-Liquid-Solid Phase Coupling Flowing in Horizontal Pipelines

To investigate the multiphase coupled flow characteristics and apparent wall slip phenomenon in horizontal pipes, air-hydraulic oil-solid mixtures flowing in 50 mm-diameter and 32 mm-diameter pipes are tested. The results show that the critical liquid velocity corresponding to the transformation of the flow structure is between 0.75 and 1 m/s. Compared to the liquid-solid flow, the injection of gas has a drag reduction effect, to a certain extent. However, with an increase in the superficial gas velocity, the relative slip contribution first increased and then decreased. Moreover, the pressure gradient and wall slip velocity of the gas-liquid-solid coupling flow were sensitive to the superficial velocity of the gas and liquid phase and the phase volume fraction, as well as pipe conditions, including the diameter and roughness. Finally, on the basis of theoretical and experimental data, a wall slip model is proposed to predict the apparent wall slip velocity and pressure gradient in gas-liquid-solid coupled flow. The model shows that the apparent wall slip effect is promoted under the condition of a low volume fraction of the dispersed phase. Compared with the experimental data, the prediction results of the model are acceptable

一种管道式油气水分离与污水处理装置及应用方法

本发明实施例公开了一种管道式油气水分离与污水处理装置，包括污水处理装置，所述污水处理装置通过管道连接有对混合了油液和废气的污水进行分离的分离装置，且在所述污水处理装置与分离装置之间设置有调节污水进入污水处理装置内的流量的油水下出口阀；其方法包括，将油气水混合液引入分离装置，之后再实时取样获取分离装置内的体积含液率，待满足要求后将混合液导入污水处理装置进行处理，最后再排出，该设备采用了管道式分离技术，能实现对采出液的控制分离，其分离效率高，且设备占地面积小制造成本低，同时该设备在进行油水分离时，可以通过起旋段将含油较高的水从回流出口送入分离装置以进行二次分离，其操作简单且无需借助工具

Three-dimensional interface structures and characteristics in a stratified gas-liquid pipe flow

In this study, the air-water flow in a pipe with a diameter of 100 mm was tested to investigate the threedimensional (3D) interfacial characteristics of gas-liquid stratified flow in horizontal and slightly inclined pipes. The gas-liquid stratified flow interface exhibited a nonflat phenomenon (concave or convex). In particular, this phenomenon was verified by the transformation of the interface shape when the gas-liquid ratio exceeded 200 and 5 in the horizontal and inclined pipes, respectively. Compared with the flow in the horizontal pipe, the liquid holdup gradually decreased with an increase in the inclination angle in the downward stratified flow, and liquid height changes at the center was slight; however, the convex interface shape was obvious. In addition, the interface exhibited regular fluctuations in the flow direction under fixed operating conditions. Therefore, the hypothesis of a nonflat interface for stratified flow was proposed based on the experimental phenomena, and the interface shape function and flow equations were constructed to predict the degree of interface bending and critical conditions for gas-liquid stratified flow by analyzing the theoretical and influencing factors. The acceleration pressure drop was introduced to quantitatively characterize interfacial fluctuations in the flow direction; therefore, a modified model for nonflat stratified flow was developed. The proposed model could characterize the interface features in both the cross-sectional and flow directions of the pipe and provided a solution for the 3D interface of stratified flow. A comparison with the experimental results revealed that the proposed model performed the prediction satisfactorily. By solving the proposed model, the interfacial information in the pipe cross section and flow direction can be effectively predicted

导流式脱气设备分离特性测试

油田生产领域,采出液在举升至地面过程中,会因泄压造成溶解气析出,形成气-液两相流,影响后续处理环节。因此在进行后续处理前需经历脱气环节去除游离态气体。本文提出了一种基于导流式气-液分离原理设计的除气设备,并展开了系统的测试工作。研究发现气相在旋流场中以气柱形式存在。给定入口条件下,气柱尺寸随分流比增加而变小。在分离效率方面,给定入口条件,分离效率随分流比增加而逐渐增加,超过临界分流比后分离效率接近100%并保持不变。临界分流比受入口条件影响,与入口液相流量呈负相关关系;与入口含气率呈正相关关系。这些成果有助于导流式除气设备的改进和优化

气-液两相垂直管流中液膜反转的数值模拟

气液两相环状流动时,气体流速的降低可能导致液膜流动方向在重力作用下反转,进而引发流型的过渡。本文对垂直管中的液膜反转现象进行瞬态数值模拟,对气-液相分布、速度、压力、壁面剪应力等参数进行动态追踪,得到液膜反转的临界气速,使用已公开的实验数据对模拟结果进行验证。模拟垂直管高1.5m,直径76mm,假设流场在二维剖面上轴对称,采用商业软件Fluent的Multi-Fluid VOF模型进行计算。结果表明,模拟的临界气速、持液率和前人实验数据吻合较好,但压力梯度偏差较大。随着气速降低,液体入口附液膜厚度和液滴夹带量显著增加。通过监测相速度和壁面剪力的动态变化,获得了携液临界气速,发现此时液膜出现间歇性的反转行为,而在大部分时间内,液膜会在界面波的带动下继续向上流动

赫歇尔-伯克利流体气液分层管流持液率特性研究

以牛顿流体、幂率流体和宾汉流体建立的气-液流动理论模型不能准确应用于非常规石油领域。为此,基于赫歇尔-伯克利流体本构,借助双流体理论和流动控制方程,推导了两相分层管流中持液率预测模型。综合考虑非牛顿流体流变特性参数,流动条件及管道倾斜角度对赫歇尔-伯克利流体气-液分层流动的影响。结果表明,非牛顿流变特性(如幂律指数和屈服应力)对两相流动中持液率具有显著影响,具体表现为液体屈服性和剪切稀化特性的增强将导致持液率的增加。对比实验数据,持液率计算模型显示出较好的预测效果。该预测模型的主要特征是,即使液体具有复杂的流变性或包含固体颗粒,也可以通过气体/非牛顿流体行为描述两相分层流动。该模型为倾斜管中复杂流体的气-液流动特性研究提供了新的见解