Local velocity scaling in T400 vessel agitated by Rushton turbine in a fully turbulent region
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Date
2017-01-01
Journal Title
Journal ISSN
Volume Title
Publisher
EPJ Web of Conferences
Abstract
The hydrodynamics and flow field were measured in an agitated vessel using 2-D Time
Resolved Particle Image Velocimetry (2-D TR PIV). The experiments were carried out in a fully baffled
cylindrical flat bottom vessel 400 mm in inner diameter agitated by a Rushton turbine 133 mm in diameter.
The velocity fields were measured in the zone in upward flow to the impeller for impeller rotation speeds
from 300 rpm to 850 rpm and three liquids of different viscosities (i.e. (i) distilled water, ii) a 28% vol.
aqueous solution of glycol, and iii) a 43% vol. aqueous solution of glycol), corresponding to the impeller
Reynolds number in the range 50 000 < Re < 189 000. This Re range secures the fully-developed turbulent
flow of agitated liquid. In accordance with the theory of mixing, the dimensionless mean and fluctuation
velocities in the measured directions were found to be constant and independent of the impeller Reynolds
number. On the basis of the test results the spatial distributions of dimensionless velocities were calculated.
The axial turbulence intensity was found to be in the majority in the range from 0.388 to 0.540, which
corresponds to the high level of turbulence intensity.
Description
Subject(s)
PIV, rushton turbine, T400 vessel, mixing
Citation
ISSN
2100-014X