Digitální knihovnaUPCE
 

23 (2017) Scientific papers, Series A

Permanentní URI k tomuto záznamuhttps://hdl.handle.net/10195/75253

Procházet

Filtry

20172

Nastavení

Autor: search.filters.author.Šiška, Bedřich

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  • Náhled
    Článekpeer-reviewedpublisher's versionOtevřený přístup
    Flow of viscoelestic liquids through metal filter screens
    (University of Pardubice, 2017) Machač, Ivan; Šiška, Bedřich
    This article reports on the results of the pressure drop measurements in dependence on the liquid volume flow rate in the creeping flow of viscoelastic aqueous polymer solutions through woven metal screens. The respective experiments were performed in a plastic cell of 50 mm inner diameter in which the tested screen had been placed. In such measurements, the six types of screens of different weaving were examined in the flow of nine various polymer solutions. In the flow, a strong elastic pressure drop excess manifests itself. By analysing the experimental data, it has been verified that the pressure drop excess can be evaluated using the corrective Deborah number function.
  • Náhled
    Článekpeer-reviewedpublisher's versionOtevřený přístup
    Rheological properties of the polyurethane adhesives
    (University of Pardubice, 2017) Palarczyková, Zuzana; Šiška, Bedřich; Machač, Ivan
    In this contribution, the results of measurements are presented concerning rheological and mechanical properties of polyurethane adhesives used in the automotive industry. The work is focused on the determination of rheological characteristics of the individual components of polymeric adhesives tested and on rheological and mechanical properties of the adhesives in the hardening process. Experiments were performed with one type of single-component adhesive and three types of two-component adhesives. All the components of PUR adhesives tested were viscoplastic with a certain degree of yield stress. The respective flow curves showed a shear-thinning and thixotropic behaviour; the results of oscillatory tests demonstrating that elastic behaviour dominated for all adhesive components. The elasticity of an adhesive evidently depended on their mixing ratio. Finally, it has been found out that adhesive gelation points measured in the hardening process could be detected much faster at a higher temperature than at a lower one.