The viscosity distribution around a rising bubble in shear-thinning non-newtonian fluids

AUTOR(ES)

Li, Shaobai, Ma, Youguang, Fu, Taotao, Zhu, Chunying, Li, Huaizhi

FONTE

Brazilian Journal of Chemical Engineering

DATA DE PUBLICAÇÃO

2012-06

RESUMO

The viscosity distribution of the liquid around a rising bubble in carboxymethyl cellulose (CMC) aqueous solutions was measured experimentally by particle image velocimetry (PIV). The effect of the concentration of CMC solutions on the viscosity distribution around a bubble and the coupling relations between the viscosity field, flow field and shear stress field were also studied. Results indicated that the specific viscosity (non-dimensionalized by η0) decreases with the increase in CMC solution concentration due to a shear thinning effect. Within the experimental range, similar viscosity distributions of liquids around a rising bubble were found: a hollow cylindrical low viscosity region around the bubble wake and a high viscosity region in the central bubble wake.

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