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Collisional restitution dependence on viscosity
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
Clarkson University, Potsdam, NY.
1992 (English)In: Journal of engineering mechanics, ISSN 0733-9399, E-ISSN 1943-7889, Vol. 118, no 5, p. 979-989Article in journal (Refereed) Published
Abstract [en]

Dense two-phase flows occur in many material processing situations. In these flows, particle collision presents a mechanism for internal resistance. In the literature, restitution coefficients are given for collisions between dry objects. Little is known about two colliding objects placed in a fluid. Thus, although two-phase flow models exist for dense mixtures, realistic values of the required restitution coefficient are not available. Recent theoretical and experimental analyses of colliding spheres in a viscous fluid show that collisional rebound depends greatly on the interstitial fluid. At very high viscosity, contact may not occur. This paper presents an experimental study of collisional restitution between steel and nylon, and a range of Newtonian viscous fluids. The fluids have a viscosity range from 27 mm2/s to 2,600 mm2/s. The normal impact velocity ranges from 0.015 m/s to 0.75 m/s. Preliminary results show that the behaviour of the impact and the resulting restitution coefficient depend on the interstitial fluid. These results will be useful to the mathematical modeling of dense two-phase flows.

Place, publisher, year, edition, pages
1992. Vol. 118, no 5, p. 979-989
National Category
Other Civil Engineering Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Operation and Maintenance; Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-7349DOI: 10.1061/(ASCE)0733-9399(1992)118:5(979)ISI: A1992HP99800008Scopus ID: 2-s2.0-0026864354Local ID: 5b9433e0-eae2-11dc-9508-000ea68e967bOAI: oai:DiVA.org:ltu-7349DiVA, id: diva2:980238
Note
Godkänd; 1992; 20080305 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Lundberg, Jan

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  • apa
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  • vancouver
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More styles
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  • de-DE
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