Fall of spherical particles through an Allen-Uhlherr model fluid

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dc.contributor.author Simon, Miloslav
dc.date.accessioned 2009-03-12T16:11:37Z
dc.date.available 2009-03-12T16:11:37Z
dc.date.issued 2007
dc.identifier Univerzitní knihovna (studovna) cze
dc.identifier.issn 1211-5541
dc.identifier.uri http://hdl.handle.net/10195/32690
dc.description.abstract In this work, the numerical solution of Hill's variational principles is presented for the estimation of upper and lower bounds to the drag coefficient correction function necessary for the determination of terminal velocity of spherical particles falling in purely viscous fluids obeying the four-parameter Allen-Uhlherr viscosity model. The calculated data of the drag coeficient correction functions are compared with the available experimental data. In the experiments, terminal falling velocities of spheres in aqueous solutions of polyalkylene glycol Emkarox HV 45 with small addition (0.06.and 0.08% wt) of polyacrylamide Praestol 2935 were measured. At the same time, viscosity function measurements and oscillation dynamic tests of liquids were performed using rheometer RS 150 (Haake). It was found that due to the liquid elasticity the experimental values Xexp of the drag coefficient correction function are beyond the calculated interval of upper and lower bounds and are higher than the upper bounds Xu However, terminal velocities of spheres falling in fluids of the similar type as the test ones can be roughly estimated using the upper bound Xufor determination of a sphere drag coefficient. eng
dc.format p. 127-143 cze
dc.language.iso eng
dc.publisher Univerzita Pardubice cze
dc.relation.ispartof Scientific papers of the University of Pardubice. Series A, Faculty of Chemical technology. 12(2006) eng
dc.rights open access eng
dc.subject fluidní mechanika cze
dc.subject kulové částice cze
dc.subject tekutiny cze
dc.subject modelové systémy cze
dc.title Fall of spherical particles through an Allen-Uhlherr model fluid eng
dc.type article cze
dc.identifier.signature 47333
dc.peerreviewed yes eng
dc.publicationstatus published eng


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