Original scientific paper
https://doi.org/10.15255/CABEQ.2013.1891
LDA Characterization of the Velocity Field around a Growing and Rising Bubble in Shear-thinning Fluid
W. Fan
; School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
X. Yin
; School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China
Abstract
Laser Doppler anemometry (LDA) has been employed to quantify the liquid velocity field around a single bubble in its generating and accelerating stage in carboxymethylcellulose (CMC) aqueous solution. The instantanoues velocities were treated by Reynolds time-averaged method, and mean velocities and its contours in both axial and radial directions were investigated. The results show that in vertical direction, the flow field characteristics of the liquids around the bubble are determined by bubble formation-rise mechanism, whereas in horizontal direction they are governed by the relative position with the bubble shear radius. The contours of axial and radial mean velocity in the test section take on the shapes of inverted trapezoid and butterfly forewing, respectively.
Keywords
bubble formation; velocity field; shear-thinning; laser Doppler anemometry
Hrčak ID:
128030
URI
Publication date:
10.10.2014.
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