%0 Journal Article
%T The viscosity distribution around a rising bubble in shear-thinning non-newtonian fluids
%A Li
%A Shaobai
%A Ma
%A Youguang
%A Fu
%A Taotao
%A Zhu
%A Chunying
%A Li
%A Huaizhi
%J Brazilian Journal of Chemical Engineering
%D 2012
%I Brazilian Society of Chemical Engineering
%R 10.1590/S0104-66322012000200007
%X 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 ¦Ç0) 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.
%K non-newtonian fluid
%K bubble
%K viscosity distribution
%K shear-thinning effect.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0104-66322012000200007&lng=en&nrm=iso&tlng=en