Bubbly flow in an axisymmetric sudden expansion: pressure drop, void fraction, wall shear stress, bubble velocities and sizes

Aloui F; Legrand J; Souhar M; Doubliez L

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Bubbly flow in an axisymmetric sudden expansion: pressure drop, void fraction, wall shear stress, bubble velocities and sizes

机译：轴对称突然膨胀中的气泡流动：压降，空隙率，壁切应力，气泡速度和大小

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摘要

In this work, a theoretical and experimental study of a bubbly flow in an axisymmetric sudden expansion is presented. A global model for the prediction of the singular pressure drop is derived and an experimental study relative to the dynamic parameters of the bubbly flow downstream of the singularity is given. The singular pressure drop has been obtained as a global formulation that integrates velocity form profiles, turbulence for every phase, and wall shear stress. In the experimental study, data concern pressure drop, wall shear stress, local and global void fraction, average and fluctuating bubble velocities and bubble sizes. These data constitute a quasi-complete experimental data bank with respect to Bel Fdhila and Simonin's recent works on the liquid phase of bubbly flow.

机译：在这项工作中，提出了在轴对称突然膨胀中气泡流的理论和实验研究。推导了预测奇异压降的全局模型，并对奇异性下游气泡流的动力学参数进行了实验研究。奇异的压降已作为整体公式获得，该公式综合了速度形式轮廓，每个相的湍流和壁面剪应力。在实验研究中，数据涉及压降，壁面剪应力，局部和整体空隙率，平均和波动的气泡速度以及气泡大小。这些数据构成了有关Bel Fdhila和Simonin最近关于气泡流液相的研究的准完整实验数据库。

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《Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics》 |1999年第2期|共13页
作者
Aloui F; Legrand J; Souhar M; Doubliez L;
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正文语种 eng
中图分类流体力学;
关键词
Bubbles (in fluids); Liquids; Gases; Expansion; Pressure drop; Shear stress; Turbulence; Velocity;

机译：气泡（液体）;液体;气体;膨胀;压降;剪切应力;湍流;速度;

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1. Bubbly flow in an axisymmetric sudden expansion: pressure drop, void fraction, wall shear stress, bubble velocities and sizes [J] . Aloui F, Legrand J, Souhar M, Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics . 1999,第2期

机译：轴对称突然膨胀中的气泡流动：压降，空隙率，壁切应力，气泡速度和大小
2. Simultaneous measurement of bubble size, velocity and void fraction in two-phase bubbly flows with time-resolved X-ray imaging [J] . Sung Yong Jung, Han Wook Park, Sang Joon Lee Journal of synchrotron radiation . 2014,第2期

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3. Experimental study on bubble velocity, void fraction and pressure drop for gas-liquid two-phase flow in a circular microchannel [J] . Akimaro Kawahara, Michio Sadatomi, Keitaro Nei, International Journal of Heat and Fluid Flow . 2009,第5期

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5. Void fraction, pressure drop, and heat transfer in high pressure condensing flows through microchannels. [D] . Keinath, Brendon. 2012

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机译：微重力气液流动研究：空隙分数，压降和流动模式

Bubbly flow in an axisymmetric sudden expansion: pressure drop, void fraction, wall shear stress, bubble velocities and sizes

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