Abstract
Shear-induced migration is ubiquitous in a suspension of solid and soft particles. The contribution to particle deformability and frictional contacts between particles needs to be clarified. By measuring normal forces with viscous resuspension experiments of frictionless droplets, we show droplet deformation does not play a significant role, contrary to frictional contacts, as the normal force is much weaker for droplets than for solid particles at high volume fractions.
Highlights
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Using absorbance measurements through a Couette cell containing an emulsion of buoyant droplets, volume fraction profiles are measured at various shear rates
Recent experimental results on viscous resuspension [31, 32] support this idea since migration was found to vary nonlinearly with respect to the shear rate, which has been interpreted as a manifestation of non-Coulombian friction
Summary
We analyze the parallax issue raised by the finite distance between the camera and TaylorCouette geometry. By considering a finite value of L, the camera received the incident light beams within an angle of 0 to α relative to the horizontal direction. This lead to a smoothing effect on the concentration profile in the vertical direction x3 through a length of l (figure 3-right). This means that the measurement of the droplet concentration was vertically averaged in this length. We can observe that the parallax in the measurement zone was negligible It became more decisive near the bottom of the geometry. The parallax did not impact the comparison of our measurements with SBM model
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