A Study on the Turbulent Mixing Characteristics in a Rushton Turbine Reactor by PIV and PLIF

Kyung Chun Kim, Eun Ho Jeong, Sang Ki Kim, Ronald J. Adrian

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

Water flow in a stirring mixer driven by a six-blade Rushton turbine has been quantified by a Particle Image Velocimetry(PIV) for a blade rotational speed of 100 r.p.m. Three different fields of view, top, middle and bottom covering the whole r-z plane were used to measure the bulk velocity field in the entire tank. A non-intrusive Planar Laser-Induced Fluorescence(PLIF) technique was applied to study the turbulent mixing process in a Rushton turbine reactor. Instantaneous and ensemble averaged concentration fields are obtained by measuring the fluorescence intensity of Rhodamine B tracer excited by a thin Nd:Yag laser sheet illuminating the whole center plane of the stirred tank. The gray level images captured by a 14-bit cooled CCD camera can be transformed to the local concentration values using a calibration matrix. Three different dye injection points were selected to observe the mixing characteristics in upper and lower bulk flow regions and the impeller flow region. It is found that the general features of the mixing pattern seem to be quite dependent on the local flow characteristics. There exist distinct two time scales: the rapid decay of mean concentration in each region after the dye infusion reflects the large scale mixing while the followed slow decay reveals the small scale mixing.

Original languageEnglish (US)
Pages (from-to)163-173
Number of pages11
JournalDLR-Mitteilung
Issue number3
StatePublished - Dec 1 2001
Externally publishedYes
EventParticle Image Velocimetry - Gottingen, Germany
Duration: Sep 17 2001Sep 19 2001

ASJC Scopus subject areas

  • Transportation
  • Aerospace Engineering

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