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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 >Flow pattern changes influenced by variation of viscosities of a heterogeneous gas-liquid mixture flow in a vertical channel
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Flow pattern changes influenced by variation of viscosities of a heterogeneous gas-liquid mixture flow in a vertical channel

机译：垂直通道中非均质气液混合物流的粘度变化对流型变化的影响

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摘要

In the steady-state flow of a heterogeneous mixture such as an air-liquid mixture, the velocity and void fraction are space- and time-dependent parameters. These parameters are the most fundamental in the analysis and description of a multiphase flow. The determination of flow patterns in an objective way is extremely critical, since this is directly related to sudden changes in spatial and temporal changes of the random like characteristic of concentration. Flow patterns can be described by concentration signals in time, amplitude, and frequency domains. Despite the vital importance and countless attempts to solve or incorporate the flow pattern phenomena into multiphase models, it has still been a very challenging topic in the scientific community since the 1940's and has not yet reached a satisfactory solution. This paper reports the experimental results of the impact of fluid viscosity on flow patterns for two-phase flow. Two-phase flow was created in laboratory equipment using air and liquid as phase medium. The liquid properties were changed by using variable concentrations of glycerol in water mixture which generated a wide-range of dynamic viscosities ranging from 1 to 1060. MPa. s. The in situ spatial concentration vs. liquid viscosity and airflow velocity of two-phase flow in a vertical ID = 50.8. mm pipe were measured using two concomitant computer-aided measurement systems. After acquiring data, the in situ special concentration signals were analyzed in time (spatial concentration and RMS of spatial concentration vs. time), amplitude (PDF and CPDF), and frequency (PSD and CPSD) domains that documented broad flow pattern changes caused by the fluid viscosity and air velocity changes.
机译：在非均质混合物（例如气液混合物）的稳态流中，速度和空隙率是与空间和时间有关的参数。这些参数是多相流分析和描述中最基本的参数。以客观的方式确定流动模式非常关键，因为这直接与浓度随机特征的空间和时间变化的突然变化有关。流量模式可以通过时域，幅度域和频域中的浓度信号来描述。尽管非常重要，并且已经进行了无数次尝试以解决将流动模式现象纳入多相模型的尝试，但自1940年代以来，它一直是科学界一个非常具有挑战性的主题，并且尚未达到令人满意的解决方案。本文报道了流体粘度对两相流流型影响的实验结果。在实验室设备中使用空气和液体作为相介质创建了两相流。通过使用可变浓度的丙三醇在水的混合物中改变液体性质，产生的动态粘度范围为1至1060 MPa。 s。垂直ID = 50.8时，两相流的原位空间浓度与液体粘度和气流速度的关系。使用两个附带的计算机辅助测量系统测量毫米管。采集数据后，按时间（空间浓度和RMS随时间变化的空间浓度和RMS），幅度（PDF和CPDF）和频率（PSD和CPSD）域分析原位特殊浓度信号，这些域记录了由流体的黏度和空气速度发生变化。

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