• Title/Summary/Keyword: PIV(Partical Image Velocimetry)

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A Study on Bubbly flow using PIV Measurement

  • Bae, Dae-Seok
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2000.11a
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    • pp.50-54
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    • 2000
  • The partical-image-velocimetry with liquid crystal tracers is used for visualizing and analysis of the bubbly flow in a vertical temperature gradient. This method allows simultaneous measurement of velocity and temperature flow fields at a given instant of time. Quantitative data of velocity were obtained by applying the MQD technique to visualized image. The paper describes the method, and presents the transient velocity patterns of bubbly flow.

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Ultrasonic Applications for the Enhancement of Turbulence Flow by using the PIV Measurement (PIV계측을 이용한 난류유동의 증진을 위한 초음파 적용)

  • Park, Y.H.;Choi, W.C.;Koo, J.H.;Song, M.G.;Ju, E.S.
    • Proceedings of the KSME Conference
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    • 2000.11b
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    • pp.633-638
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    • 2000
  • Ultrasonic applications for the enhancement of turbulence flow by using the PIV measurement were carried out according to the angle of the ultrasonic oscillator, materials of the reflector and each section when ultrasonic is reflected several times. Angles of the ultrasonic oscillator such as $30^{\circ},\;45^{\circ},\;60^{\circ},\;90^{\circ},\;120^{\circ},\;135^{\circ}$ and $150^{\circ}$ were selected, and turbulent intensities were compared at Reynolds No. 2,000 and 4,000. Materials of the reflector such as wood, acryl, iron and glass were selected, and time mean velocity vector and turbulent intensity were compared at Reynolds No. 4,000. The zone which was observed was selected from first section to fourth section when ultrasonic was reflected several times. Every data such as time mean velocity vector and time mean turbulent intensity which was obtained by PIV measurement was examined, compared and discussed at Reynolds No. 2,000 and 4,000 to know the degree of turbulence enhancement in each case.

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