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Laboratory testing of granular kinetic theory for intense bed load transport

In: Journal of Hydrology and Hydromechanics, vol. 66, no. 3
Václav Matoušek - Štěpán Zrostlík
Detaily:
Rok, strany: 2018, 330 - 336
Kľúčové slová:
Granular flow; Sheet flow; Sediment transport; Grain collision; Tilting flume experiment.
URL originálneho zdroja: http://www.ih.sav.sk/jhh
O článku:
Collisional interactions in a sheared granular body are typical for intense bed load transport and they signifi-cantly affect behavior of flow carrying bed load grains. Collisional mechanisms are poorly understood and modelling approaches seldom accurately describe reality. One of the used approaches is the kinetic theory of granular flows. It of-fers constitutive relations for local shear-induced collision-based granular quantities – normal stress, shear stress and fluctuation energy – and relates them with local grain concentration and velocity. Depth distributions of the local granu-lar quantities produced by these constitutive relations have not been sufficiently verified by experiment for the condition of intense bed load transport in open channels and pressurized pipes. In this paper, results from a tilting-flume facility in-cluding measured velocity distribution and deduced concentration distribution (approximated as linear profiles) are used to calculate distributions of the collision-based quantities by the constitutive relations and hence to test the ability of the kinetic-theory constitutive relations to predict conditions observed in these collision-dominated flows. This test indicates that the constitutive relations can be successfully applied to model the local collisional transport of solids at positions where the local concentration is not lower than approximately 0.18 and not higher than approximately 0.47.
Ako citovať:
ISO 690:
Matoušek, V., Zrostlík, Š. 2018. Laboratory testing of granular kinetic theory for intense bed load transport. In Journal of Hydrology and Hydromechanics, vol. 66, no.3, pp. 330-336. 0042-790X (until 2019) .

APA:
Matoušek, V., Zrostlík, Š. (2018). Laboratory testing of granular kinetic theory for intense bed load transport. Journal of Hydrology and Hydromechanics, 66(3), 330-336. 0042-790X (until 2019) .