KINETIC THEORY BASED APPROACH TO MODELLING OF SEGREGATION IN INTENSE BIMODAL BED LOAD TRANSPORT

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F17%3A00313676" target="_blank" >RIV/68407700:21110/17:00313676 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

KINETIC THEORY BASED APPROACH TO MODELLING OF SEGREGATION IN INTENSE BIMODAL BED LOAD TRANSPORT

Popis výsledku v původním jazyce

Intense bed load grains are transported over an erodible bed through a transport layer. The local concentration of grains varies considerably across the transport layer from zero at the top of the layer to values near the bed concentration at the bottom of the layer. Kinetic theory (KT) offers constitutive relations which relate local granular stresses with local concentration and velocity (gradient) in collision-dominated granular flows. Extended kinetic theory takes care of flows at high concentrations where clustering of grains dominates over binary collisions. The goal of the present work is to test the kinetic theory based approach by Larcher and Jenkins to modelling of a segregation process in intense bimodal bed load at conditions observed in our tilting-flume experiments. For the bimodal flows, we observed a development of a sliding layer of finer grains at the top of the deposit as a result of the segregation process. We show that the development of such a layer is also a result of the kinetic-theory based model simulating segregation of two fractions which differ in grain size.

Název v anglickém jazyce

KINETIC THEORY BASED APPROACH TO MODELLING OF SEGREGATION IN INTENSE BIMODAL BED LOAD TRANSPORT

Popis výsledku anglicky

Intense bed load grains are transported over an erodible bed through a transport layer. The local concentration of grains varies considerably across the transport layer from zero at the top of the layer to values near the bed concentration at the bottom of the layer. Kinetic theory (KT) offers constitutive relations which relate local granular stresses with local concentration and velocity (gradient) in collision-dominated granular flows. Extended kinetic theory takes care of flows at high concentrations where clustering of grains dominates over binary collisions. The goal of the present work is to test the kinetic theory based approach by Larcher and Jenkins to modelling of a segregation process in intense bimodal bed load at conditions observed in our tilting-flume experiments. For the bimodal flows, we observed a development of a sliding layer of finer grains at the top of the deposit as a result of the segregation process. We show that the development of such a layer is also a result of the kinetic-theory based model simulating segregation of two fractions which differ in grain size.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

<a href="/cs/project/GA16-21421S" target="_blank" >GA16-21421S: Analýza stratifikovaného proudění s volnou hladinou založená na kinetické teorii zrnitých směsí</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

18th International Conference on Transport & Sedimantation of Solid Particles

ISBN

978-83-7717-269-8

ISSN

0867-7964

e-ISSN

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Počet stran výsledku

8

Strana od-do

409-416

Název nakladatele

Wroclaw University of Environmental And Life Sciences

Místo vydání

Wroclaw

Místo konání akce

Praha

Datum konání akce

11. 9. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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