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We survey simulations of two-dimensional flowing foam inspired by recent illuminating experiments. We also describe the viscous froth model, an effective tool for such simulations, which accurately represents the detailed structure of the foam and includes a linear drag force.
We study the rheological behavior of mixtures of foams and pastes, which can be described as suspensions of bubbles in yield stress fluids. Model systems are designed by mixing monodisperse aqueous foams and concentrated emulsions. The elastic modulus of the bubble suspensions is found to depend on the elastic capillary number , defined as the ratio of the paste elastic modulus...
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