Three-dimensional experimental investigation of the two-phase flow structure in a bubbly pipe flow /
An experimental study was performed to investigate the turbulence structure in a bubbly flow. Particle Image Velocimetry (PIV), a whole-field, non-invasive velocity measurement technique, was utilized. PIV is capable of producing an instantaneous velocity map of steady-state and transient flows of a...
| Main Author: | |
|---|---|
| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1999.
|
| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=733678471&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | An experimental study was performed to investigate the turbulence structure in a bubbly flow. Particle Image Velocimetry (PIV), a whole-field, non-invasive velocity measurement technique, was utilized. PIV is capable of producing an instantaneous velocity map of steady-state and transient flows of a fluid seeded with microscopically small neutral density particles (within either a two-dimensional plane or a three- dimensional volume). Both qualitative and quantitative spatial information about the flow field being studied can be obtained. The quantitative spatial velocity information can be further processed into useful information of different flow parameters such as vorticity, datelines, velocity distributions, turbulence intensities, and kinetic energies. An experimental test facility was constructed to generate and visualize the bubbles which were studied as they rose vertically in a clear pipe. The study investigated the influence of a bubble on the surrounding flow field (bubble/flow interaction). A stereoscopic reconstruction technique was developed to obtain the three-dimensional velocity vector data from the recorded planar images. Conditional sampling of the fluid velocity components for a fixed (determined) bubble path within the viewing volume was applied. The flow pattern in the wake region produced by the bubble presence was unsteady. The results showed a general agreement with theoretical results and previous studies found in the literature. Oscillations in the now field downstream (front) of the rising bubble were noted, for a distance of about one to two bubble diameters. Vortex tubes and recirculation regions upstream (back) of be rising bubble were also observed. |
|---|---|
| Item Description: | Vita. "Major Subject: Nuclear Engineering". |
| Physical Description: | x, 163 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 87-91). |