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SIMULTANEOUS PIV/PTV MEASUREMENTS OF BUBBLE AND PARTICLE PHASES IN GAS-LIQUID TWO-PHASE FLOW BASED ON IMAGE SEPARATION AND RECONSTRUCTION

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Journal of Hydrodynamics 2004年第6期16卷 756-766页

作者： qujian-wu MURAlYuichi YAMAMOTOFujio DepartmentofMechanicalEngineering UniversityofFukuiFukuiJapan／／CollegeofIndustrialEngineeringWenzhouUniversityWenzhou325007China DivisionofMechanicalScience SchoolofEngineeringHokkaidoUniversityKitakuJapan FiberAmenityEngineeringCourse GraduateSchoolofEngineeringUniversityofFukuiFukuiJapan

A Particle Image Velocimetry (PIV) method based on the image separation andreconstruction with the median filter and triangular Bezier patch was proposed to measure multiplevelocity fields from single-camera images in the present study. The method was examined on syntheticPIV images with the Green-Taylor two-phase vortex flows and the test results showed high accuracyand highly correct tracking percent compared with the exact solution. An experiment of the bubblyjet flow was also conducted as a practical demonstration of the present method. As a result, it isconfirmed from the simulation image examination and the experimental measurement that the proposedmethod shows a good performance in the measurement of bubble and particle phases.

关键词： multiphase flow flow visualization image separation image reconstruction particle image velocimetry (PIV) triangular bezier patch

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维普期刊数据库

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MEASUREMENT OF BUBBLE-BUBBLE INTERACTION DEPENDED ON REYNOLDS NUMBER USING STEREOSCOPIC BUBBLE-TRACKING TECHNIQUE

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Journal of Hydrodynamics 2005年第2期17卷 243-251页

作者： qujian-wu MURAlYuichi YAMAMOTOFujio DepartmentofMechanicalEngineering UniversityofFukuiFukuiJapan／／CollegeofIndustrialEngineeringWenzhouUniversityWenzhou325035China DivisionofMechanicalScience SchoolofEngineeringHokkaidoUniversitySapporo.Japan FiberAmenityEngineeringCourse GraduateSchoolofEngineeringUniversityofFukuiFukuiJapan

Bubble-bubble interaction in free rising bubbly flows is experimentally investigated in the present study. The velocity vectors of the bubbles are measured by a stereoscopic bubble-tracking technique and then the relative velocity vectors of two nearest-neighbor bubbles are calculated with high statistical reliability. With the measurement data at Reynolds number ranging from 5 to 75, the vertical attraction and the horizontal repulsion are confirmed for Re30 have repulsive velocity bothin the horizontal and the vertical directions as those rise closely. Moreover, the three-dimensional structure of the bubble-bubble interaction is discussed with the data analysis of the interaction vector fields.

关键词： bubbly flow bubbly dynamics three-dimensional measurement PTV image processing

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维普期刊数据库

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