Nondimensional Parameters Governing Hyperconcentrated Flow in a Open Channel

Autor:	Haruyuki Hashimoto, Akira Fukutomi, Kouji Taguma, Muh. Saleh Pallu, Muneo Hirano
Rok vydání:	1992
Předmět:	Drag coefficient Materials science Characteristic length Turbulence media_common.quotation_subject Organic Chemistry Thermodynamics Mechanics Inertia Biochemistry Debris flow Open-channel flow Physics::Fluid Dynamics Hyperconcentrated flow Drag media_common
Zdroj:	PROCEEDINGS OF HYDRAULIC ENGINEERING. 36:221-226
ISSN:	1884-9172 0916-7374
DOI:	10.2208/prohe.36.221
Popis:	Nondimensional parameters governing rapid hyperconcentrated flows are derived by the comparison between intergranular-stress and inertia terms in the momentum equation. It is found that the ratio of flow depth to grain diameter and volumetric concentration of grains for the estimate of friction forces acting on a bed, and the ratio of tube diameter to grain diameter and concentration for that of drag forces on a tube are important parameters.Relationship of friction and drag coefficients to these parameters is investigated experimentally. Dependence of drag coefficient on concentration and nondimensional tube diameter is found similar to that of friction coefficient on concentration and nondimensional depth.For the larger concentration and smaller ratio of a characteristic length to grain diameter intergranular interactions play dominant role. For the larger ratio, on the other hand, the effect of turbulence of the hyperconcentrated flows becomes major.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7392db58df47df979c88e63556b65cbb https://doi.org/10.2208/prohe.36.221 Zobrazit plný text záznamu