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

作　　者：QUJian-wu MURAlYuichi YAMAMOTOFujio 

机构地区：[1]DepartmentofMechanicalEngineering,UniversityofFukui,Fukui,Japan／／CollegeofIndustrialEngineering,WenzhouUniversity,Wenzhou325035,China [2]DivisionofMechanicalScience,SchoolofEngineering,HokkaidoUniversity,Sapporo.Japan [3]FiberAmenityEngineeringCourse,GraduateSchoolofEngineering,UniversityofFukui,Fukui,Japan

出　　处：《Journal of Hydrodynamics》2005年第2期243-251,共9页水动力学研究与进展B辑（英文版）

基　　金：This work was supported as Grant In Aid Research by the Japanese Ministry ofEducation; Science and Culture (GrantNos: CN15560135 and CN15760104)

摘　　要：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 Re<10 as known by the past study based on Navier-Stokes simulation. The new finding of the present measurement is that the bubbles of Re>30 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.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 Re<10 as known by the past study based on Navier-Stokes simulation. The new finding of the present measurement is that the bubbles of Re>30 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 

分 类 号：TV131.32[水利工程—水力学及河流动力学]