caa a22 4500 605466327 CHVBK 20210128100306.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00397-014-0815-x doi (NATIONALLICENCE)springer-10.1007/s00397-014-0815-x Absence of pressure sensitivity of apparent wall slip in pressure-driven flow of non-colloidal suspensions [Elektronische Daten] [Sven Pieper, Nadine Kirchhoff, Hans-Joachim Schmid] We investigated an explanation for the length dependence of apparent wall slip in capillary and slit die experiments that had been implied in earlier studies. Firstly, we used a very long slit die fitted with six equidistant pressure transducers and an adjustable outlet. It was found that, all other parameters being equal, the impact of pressure on the flow behavior of suspensions was not different from the impact on the unfilled matrix fluid. Particle-related properties, such as apparent wall slip, were therefore not influenced by pressure as assumed by other authors. Secondly, we determined wall slip velocities by both the Mooney method and numerical simulation, based on an implementation of Phillips constitutive equation for particle migration. This led to a similar length dependence of wall slip as had been reported in an earlier work. We concluded that this was due to the transient nature of particle migration and its interrelationship with apparent wall slip, rather than an influence of pressure. Springer-Verlag Berlin Heidelberg, 2014 Apparent wall slip nationallicence Particle migration nationallicence Suspension flow nationallicence Slit die nationallicence Wall depletion nationallicence Pieper Sven Particle Technology Group, University of Paderborn, Warburger Straße 100, 33098, Paderborn, Germany aut Kirchhoff Nadine Particle Technology Group, University of Paderborn, Warburger Straße 100, 33098, Paderborn, Germany aut Schmid Hans-Joachim Particle Technology Group, University of Paderborn, Warburger Straße 100, 33098, Paderborn, Germany aut Rheologica Acta Springer Berlin Heidelberg 54/1(2015-01-01), 69-75 0035-4511 54:1<69 2015 54 397 https://doi.org/10.1007/s00397-014-0815-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-014-0815-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pieper Sven Particle Technology Group, University of Paderborn, Warburger Straße 100, 33098, Paderborn, Germany aut NATIONALLICENCE 700 1- Kirchhoff Nadine Particle Technology Group, University of Paderborn, Warburger Straße 100, 33098, Paderborn, Germany aut NATIONALLICENCE 700 1- Schmid Hans-Joachim Particle Technology Group, University of Paderborn, Warburger Straße 100, 33098, Paderborn, Germany aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/1(2015-01-01), 69-75 0035-4511 54:1<69 2015 54 397