Abstract

Abstract The drag and the rise velocity of a spherical bubble rising freely and slowly in an inelastic Carreau fluid are calculated by a perturbation method. Measurements of the rise velocity of gas bubbles in several Newtonian and non-Newtonian fluids are reported. The transition from the Stokes to the Hadamard-Rybczynski regimes has been observed and in the case of viscoelastic fluids a jump discontinuity in the velocity has also been recorded. An equation is proposed to predict the volume at which the jump discontinuity occurs and the prediction is in good agreement with the experimental data.

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