1. bookVolume 66 (2018): Edizione 3 (September 2018)
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Rivista
eISSN
1338-4333
Prima pubblicazione
28 Mar 2009
Frequenza di pubblicazione
4 volte all'anno
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Inglese
access type Accesso libero

Laboratory testing of granular kinetic theory for intense bed load transport

Pubblicato online: 14 Aug 2018
Volume & Edizione: Volume 66 (2018) - Edizione 3 (September 2018)
Pagine: 330 - 336
Ricevuto: 28 Dec 2017
Accettato: 20 Feb 2018
Dettagli della rivista
License
Formato
Rivista
eISSN
1338-4333
Prima pubblicazione
28 Mar 2009
Frequenza di pubblicazione
4 volte all'anno
Lingue
Inglese
Abstract

Collisional interactions in a sheared granular body are typical for intense bed load transport and they significantly 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 offers 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 granular 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 including 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.

Keywords

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