It is known that Jeffery’s equation predicts that fibers with Jeffery’s parameter less than one will exhibit periodic behavior when subjected to shear flows. Yet this behavior is not seen in suspensions containing many fibers. This paper explores the extent to which coupling Jeffery’s equation with the viscosity of the suspension causes instability that breaks up this periodic behavior. A simpl...

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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 Ca G , defined as the ratio of the paste elastic modulus to the bubb...

We show that Hertzian particle contacts are the underlying cause of as-yet-unexplained noninteger power laws in weakly nonlinear rheology. In medium amplitude oscillatory shear (MAOS) region, cubic scaling leading order stress ($\sigma_\mathrm{3} \sim \gamma_\mathrm{0}^{m_\mathrm{3}}$, $m_\mathrm{3}=3$) is standard expectation. Expanding on work by Natalia et al. [J. Rheol. 64 625-635 (2020)], ...

Fluidized beds are suspensions of grains by ascending fluids in tubes, and commonly used industry given their high rates mass heat transfers between the solids fluid. Although usually employed large scales (tube diameter order meter), fluidized have a great potential much smaller (order millimeter) for processes involving powder fluids. Of particular interest is pharmaceutical industry, which c...

Magnetorheological (MR) fluids are field-responsive suspensions of magnetizable particles which rheological properties can be dramatically altered by applying external magnetic fields (Phulé and Ginder 1998). Under the presence of a magnetic field, anisotropic chainlike structures result from field-induced particle magnetization as a consequence of the permeability mismatch between particle and...

Abstract Complex fluids exhibit a variety of exotic flow behaviours under high stresses, such as shear thickening and jamming. Rheology is powerful tool to characterise these over the bulk fluid. However, this technique limited in its ability probe fluid behaviour spatially resolved way. Here, we utilise high-speed imaging free-surface geometry drop impact study colloidal suspensions. report ob...