Abstract
To demonstrate the advantage of the gradient ultrasound pulse Doppler method in laminar tube flow, a rather complex body lotion is tested. The results reveal that the fluid shows Newtonian behaviour up to some critical shear rate γ ̇ c . For γ ̇ > γ ̇ c , a sudden phase separation can be detected: a Newtonian one close to the axis, followed by one in which the shear rate stays constant. Accompanying is this stress banding by slip. Customary means to account for this type of slip do not exist.
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