SIMULTANEOUS VELOCITY-MEASUREMENTS OF BOTH COMPONENTS OF A 2-PHASE FLOW USING PARTICLE IMAGE VELOCIMETRY
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abstract
The study undertaken is an examination of a two-phase dispersed air bubble mixing flow within a rectangular vessel. The technique of particle image velocimetry (PIV) is utilized in order to obtain non-invasive velocity measurements of the resulting bubbly flow field and its induced effects upon a surrounding liquid medium. The method provides not only a visualization of the various patterns and structures of a given flow field, but also yields quantitative full-field instantaneous velocity data from both phases of a two-phase system in a concurrent manner. PIV is a rapidly advancing flow visualization technique in which the instantaneous velocity profile of a given flow field is determined by photographically recording tracer particle and/or bubble images within the flow at discrete instances in time, and then conducting computational analysis of the digitized data. The use of developed analysis algorithms, which perform a point-by-point matching of particle and bubble images from one digital image frame to the next, subsequently allows reconstruction of the respective instantaneous velocity profiles. The ability to simultaneously measure the velocity fields of both components of a two-phase flow is an important contribution toward the goal of developing improved correlations for flow regime determination as well as improved model for key two-phase flow parameters such as the interfacial drag. In this work, results were obtained which indicate that the described PIV method is an effective tool in the study of the specific interactions which occur between components in a wide variety of multiphase systems. 1992.
