4 research outputs found
Dynamics of the Iodine-goitrogen Balance in the Thyroid Status of Catfish from Selected Fresh and Brackish Water Bodies
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Hydrodynamic particle migration in small-amplitude, oscillatory, circular couette flow: The limits of reversibility
Initially well-mixed suspensions of large spherical particles in viscous Newtonian fluids subjected to continuous nonhomogeneous shear flows demix and establish large concentration gradients. A number of experimental studies have determined that the particles migrate to the low shear-rate region in one-dimensional flow fields. Other investigators have proposed mechanisms to model the migration caused by the presence of nonuniform shear gradients. Here, we report on the shear-induced migration of particles in the annular space between two coaxial cylinders (a wide-gap Couette), with the inner cylinder oscillating and the outer cylinder fixed. In these experiments, the conditions are such that colloidal and inertial forces do not exert an appreciable effect on the suspensions of neutrally bouyant spherical particles in Newtonian liquids. Nuclear magnetic resonance (NMR) imaging is used to measure the concentration profile during the demixing of the initially well-mixed suspensions