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| 1 | EXPERIMENTAL STUDY ON GAS-LIQUID TWO-PHASE FLOWS IN AN AREATION TANK BY USING IMAGE TREATMENT METHOD显示文摘Particle Image Velocimetry (PIV) technique was employed to study experimentally gas-liquid two-phase flow in an aeration tank. In terms of the PIV principles, an algorithm of PIV based on the Fast Fourier Transformation (FFT) was worked out. The PIV program was developed and verified, and then was used to measure three kinds of states in the testing device. The program was also used to calculate and analyze the related parameters. The experimental data indicate that the bubbles in testing device have the longest resident time and stronger turbulent intensity for the gas-liquid two-phase flow in a special case (Case 3), resulting in great increase of the oxygen transferring speed and efficiency, whereby providing the basis for the selection design of aeration tank. | CHENG Wen LIU Wen-hong HU Bao-wei WAN Tian | 2008 | Journal of Hydrodynamics2008，20，5： | 13 |
| 2 | Numerical simulation of two-phase turbulent flow in hydraulic and hydropower engineering显示文摘In connection with the specific features of high velocity aerated flow generated by hydraulic engineering structures, the mathematical model is developed for high turbulence air-water two-phase flow with the use of twin flow theoretical model in this paper. Furthermore the numerical method is proposed to treat bubbled flows. In addition, on the basis of air-water stratified twin flow model, the new calculation methods and free surface tracking technique are proposed to describe complicated movements of the free surface. Finally, the proposed model is used to calculate artificial aerated flows. The computed results coincide quite well with experimental results. This means that the proposed method can provide solid basis for practical engineering design. | DAI HuiChao1,2?, WANG LingLing1, GAO JiZhang3, ZHANG XiaoDong3 & YANG ZhongHua2 1 College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China 2 China Yangtze River Three Gorges Project Development Corporation, Yichang 443002, China 3 China Institute of Water Resources and Hydropower Research, Beijing 100044, China | 2007 | Science China(Technological Sciences)2007，50，z1： | 3 |
| 3 | LIQUID PHASE FLOW ESTIMATION IN GAS-LIQUID TWO-PHASE FLOW USING INVERSE ANALYSIS AND PARTICLE TRACKING VELOCIMETRY显示文摘An inverse analysis algorithm is proposed for estimating liquid phase flow field from measurement data of bubble motion. This kind of technology will be applied in future for various estimation of fluid flow in rivers, lakes, sea surface flow, and also microscopic channel flow as the problem-handling in civil, mechanical, electronic, and chemical engineering. The relationship between the dispersion motion and the carrier phase flow is governed and expressed by the translational motion equation of spherical dispersion. The equation consists of all the force components including inertia, added inertia, drag, lift, pressure gradient force and gravity force. Using this equation enables us to estimate the carrier phase flow structure using only the data of the dispersion motion. Whole field liquid flow structure is also estimated using spatial or temporal interpolation method. In order to verify this principle, the Taylor-Green vortex flow, and the Karman vortex shedding from a square cylinder have been chosen. The results show that the combination of the inverse analysis and Particle Tracking Velocimetry (PTV) with the spatio-temporal post-processing algorithm could reconstruct well the carrier phase flow of the gas-liquid two-phase flow. | CHENGWen MURAlYuichi SASAKIToshio YAMAMOTOFujio | 2004 | Journal of Hydrodynamics2004，16，6： | 1 |
| 4 | 序批式反应器内多尺度三相流动的数值模拟显示文摘提出1个混合模型来数值模拟序批式反应器内气-液-固三相的多尺度流动.该混合模型采用Level Set方法模拟曝气气泡的运动,应用离散颗粒方法处理活性污泥固体的运动,运用体积平均的Navier-Stokes方程描述液相的流动.模型考虑了颗粒-气泡、颗粒-流体以及气泡-流体之间的相互作用.通过模拟反应器内曝气气泡生成、上升以及污泥沉淀的动态过程,检验了模型的可行性.流动结构的模拟结果显示,在反应器中污泥与污水均有明显的环流特征.气泡与颗粒相互作用引起的气泡破碎行为会导致反应器内大量小气泡的生成以及污泥颗粒的弥散.反应器内这些流体动力学特征使得污泥与污水达到充分混合,有利于生物降解处理. | 李彦鹏 王焕然 | 2007 | 环境科学学报2007，27，9： | 1 |
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