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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Electrodiffusion Diagnostics of Apparent Wall Slip in Polymer Solutions
 Wein, Ondřej ; Tovčigrečko, Valentin ; Večeř, M. ; Sobolík, Václav
Two substantially improved experimental methods, the apparent wall slip (AWS) rotational viscometry with a Morse-taper sensor and electrodiffusion (ED) flow diagnostics with autocalibrated friction probes, are used to study near-to-wall velocity profiles in aqueous solutions of high-molecular polysaccharides under viscometric flow conditions. By comparing the velocity data from the both methods, estimates of the depleted layer thickness in dependence on wall shear stress are obtained. The ED data support the two-layer model of AWS effect, with the constant enhanced fluidity across the depleted layer.
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Elektrodifuzní diagnostika toku pro kapaliny vykazující zdánlivý skluz na stěně
 Wein, Ondřej ; Večeř, Marek ; Tovčigrečko, Valentin ; Sobolík, Václav
Anomalous near-wall flow kinematics of aqueous solutions og high-molecular polysaccharide solutionns containing electrolytes has been studied using two indipendent experimental techniques: electrolytical mass-transfer measurements under conditions of limiting diffusion conditions and viscometry with varied gap thickness for detecting the apparent wall slip.
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