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2 International Journal of Applied Mechanics and Engineering

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Modelling of the flow of streams of cohesionless and cohesive bulk materials in a conveyor discharge point with a flat conveyor belt

100%

Cyganiuk J. A. , Kuryło P.

tom Vol. 23, no. 1

23--35

The paper presents the analysis of flow conditions of cohesive and cohesionless bulk materials in a conveyor discharge point of a flat conveyor belt. The analysis was carried out for stationary flows at high velocities. It presents mathematical methods for the description of the velocity of a material leaving a throwing point of a flat conveyor belt as well as final equations which enable the determination of velocity of the material after it has left the throwing point (with the accuracy sufficient for practical use). Next, the velocity calculated for the proposed mathematical description (for selected material groups) has been compared with the velocity obtained from mathematical relations commonly used by engineers. The proposed equations for determining the velocity of the material beyond the point have proved useful, since they enable excluding the indirect equations. Finally, the difference between the values of the velocity obtained with the proposed and indirect equations have been determined and the relative error for the proposed method has been calculated.

The influence of an effective friction angle on the velocity of material of group III, leaving the impact plate

80%

Cyganiuk J. A. , Kuryło P. , Tertel E.

tom Vol. 14, no 4

929-939

The paper presents the analysis of the influence of an effective friction angle on the velocity of a cement-type material of group III, leaving the flat plate of the pouring point. The analysis was carried out for oversized cement particles, with grain diameters classifying them as a material of group III. The analysis was carried out in the real conditions of cement production and for the impact plate mounted in the impact flowmeter GRAN 30. The effective friction angle of the oversized cement particles type CEMII A-V 42,5 R was considered to be the reference value. The velocity values were determined theoretically with the use of a mathematical model of the flow of a stream of bulk material in an impact point with a flat impact plate.