GROUND OF RATIONAL ANGLE OF HYDRAULIC CLASSIFIER BOTTOM SLOPE

Details

Parent Category: Geo-Technical Mechanics, 2013

Category: Geo-Technical Mechanics, 2013, Issue 112

UDC 622.271

Author

A.O. Bondarenko, Ph.D. (Tech.), Associate Professor

(SHEE «NMU»)

Abstract. Dependence of hard particle balanced state parameters on the surface slope angle is formulated as a result of process simulation of carrying laminar stream interaction with solid particles located on the sloping surfaces. It is stated that a hard particle placed on a sloping surface, keeps balance being under affect of the stream flowing at a speed being proportional to diameter of the particle, the surface slope angle and coefficient of external sliding friction. Experimental research of process of the solid particles motion along the sloping tray made of popular construction materials (organic glass, poliuretan, steel, rubber), and determination of external sliding friction factor of granular material in water allows to state that the external sliding friction factor of gravel quarz particles in water is the function of solid particle size. Decreasing of solid particle size leads to enhancement of the external sliding friction factor. Calculation of equilibrium speed of natural river quarz gravel solid particle on the slope surface made of organic glass, poliuretan, steel and rubber demonstrates that if a particle is located on the slope surface and the flow is directed downwards, the equilibrium remains when the flow speed decreases. However, when the flow is directed upwards, it is necessary to increase the carrying flow speed in order to save equilibrium. The obtained dependences allow analyzing of the created hydraulic classifier design and choosing rational parameters for them.

Key words: solid particle, sloping surface, hydraulic classifier, equilibrium speed, laboratory facility, external sliding friction factor.

References:

1. Bondarenko А.А. (2012), «Mathematical design of particles motion under influence of speed pressure», Metallurgicheskaya i gornorudnaya promyshlennost, no.1, pp. 66 – 68.

About the author

Bondarenko Andrii Oleksijovich, Candidate of Technical Sciences (Ph.D.), Associate Professor of Department of mining machines and engineering, State higher educational establishment «National mining university» (SHEE «NMU»), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

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