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首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005) vol.2; 20050717-22; San Francisco,CA(UA) >AXIAL DEVELOPMENT OF VERTICAL UPWARD BUBBLY FLOW IN A MINIPIPE
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AXIAL DEVELOPMENT OF VERTICAL UPWARD BUBBLY FLOW IN A MINIPIPE

机译：三角帆中垂直向上气泡的轴向发展

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摘要

Accurate prediction of the interfacial area concentration is essential to successful development of the interfacial transfer terms in the two-fluid model. Mechanistic modeling of the interfacial area concentration entirely relies on accurate local flow measurements over extensive flow conditions and channel geometries. From this point of view, accurate measurements of flow parameters such as void fraction, interfacial area concentration, gas velocity, bubble Sauter mean diameter, and bubble number density were performed by the image processing method at five axial locations in vertical upward bubbly flows using a 1.02 mm-diameter pipe. The frictional pressure loss was also measured by a differential pressure cell. In the experiment, the superficial liquid velocity and the void fraction ranged from 1.02 m/s to 4.89 m/s and from 0.980 % to 24.6%, respectively. The obtained data give near complete information on the time-averaged local hydrodynamic parameters of two-phase flow. These data can be used for the development of reliable constitutive relations which reflect the true transfer mechanisms in two-phase flow. As the first step to understand the flow characteristics in mini-channels, the applicability of the existing drift-flux model, interfacial area correlation, and frictional pressure correlation was examined by the data obtained in the mini-channel.
机译：界面面积浓度的准确预测对于成功开发双流体模型中的界面转移项至关重要。界面面积浓度的机械建模完全依赖于广泛的流动条件和通道几何形状上的准确局部流量测量。从这个角度出发，通过图像处理方法，在垂直向上的气泡流的五个轴向位置上，利用空泡比，界面面积浓度，气体速度，气泡Sauter平均直径和气泡数密度等流量参数的准确测量。直径为1.02毫米的管道。摩擦压力损失也通过差压传感器测量。在实验中，表观液体速度和空隙率分别为1.02m / s至4.89m / s和0.980％至24.6％。所获得的数据提供了关于两相流时间平均局部水动力参数的近乎完整的信息。这些数据可用于开发可靠的本构关系，从而反映两相流中的真实传递机制。理解微型通道中流动特性的第一步，是通过微型通道中获得的数据来检验现有的漂移-通量模型，界面面积相关性和摩擦压力相关性的适用性。

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