Solid recovered fuels. Methods for the determination of bridging properties of bulk materials

2015 ◽  
Keyword(s):  
Bulk Materials

scholarly journals ДОСЛІДЖЕННЯ ЕНЕРГОЕФЕКТИВНОСТІ ОБЛАДНАННЯ ДЛЯ ЗМІШУВАННЯ СИПКИХ МАТЕРІАЛІВ

2019 ◽  
Vol 136 (4) ◽  
pp. 42-48
Author(s):  
О. П. Бурмістенков ◽  
Т. Я. Біла ◽  
В. В. Стаценко
Keyword(s):  
Mathematical Modeling ◽  
Comparative Analysis ◽  
Electric Drive ◽  
Bulk Materials ◽  
Energy Parameters ◽  
Motion Study ◽  
Theoretical Mechanics

The energy parameters determination of bulk materials mixing equipment. Methodology.  The  paper  used  methods  of  mathematical  modeling,  comparative  analysis  and research  of  electric  drive.  The  particles  motion  study  inside  the  mixer  was  performed  on  the  theoretical mechanics laws basis.

scholarly journals Study of the nature of the dynamic coefficient of internal friction of grainmaterials

2019 ◽  
Vol 135 ◽  
pp. 01102
Author(s):  
Dmitriy Savenkov ◽  
Oleg Kirischiev ◽  
Ylia Kirischieva ◽  
Tatiana Tupolskikh ◽  
Tatiana Maltseva ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Internal Friction ◽  
Agricultural Production ◽  
Mechanical Characteristics ◽  
Dynamic Coefficient ◽  
Bulk Materials ◽  
Dynamic Coefficients ◽  
Internal Friction Coefficient ◽  
Physical And Mechanical Characteristics

The article highlights the issues related to the study of physical and mechanical characteristics of bulk materials, namely internal friction coefficients in static and dynamic modes. An innovative device of the carousel type for determining the frictional characteristics of bulk materials is described, which allows to implement the tasks of practical determination of dynamic coefficients of internal friction. Presented the program, methodology and results of research on the practical study of the internal friction coefficient of typical bulk products of agricultural production in the range of linear velocities of displacement of layers from 0 to 2.79 m/s, the reliability of which is not lower than 0.878.

scholarly journals Modelling of the Flow of Streams of Cohesionless and Cohesive Bulk Materials in a Conveyor Discharge Point with a Flat Conveyor Belt

2018 ◽  
Vol 23 (1) ◽  
pp. 23-35 ◽  
Author(s):  
J.A. Cyganiuk ◽  
P. Kuryło
Keyword(s):  
Mathematical Description ◽  
Conveyor Belt ◽  
Flow Conditions ◽  
Mathematical Methods ◽  
Bulk Materials ◽  
Discharge Point ◽  
Stationary Flows ◽  
The Difference ◽  
Mathematical Relations

Abstract 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.

Independent Determination of the Thermal Diffusivity and Conductivity of a Thin Metallic Layer Deposited on Silica

2008 ◽  
Author(s):  
Christian Fretigny ◽  
Jean Paul Roger ◽  
Li Liu ◽  
Danie`le Fournier
Keyword(s):  
Thermal Diffusivity ◽  
Careful Analysis ◽  
Thin Layers ◽  
Heat Diffusion ◽  
Bulk Materials ◽  
Thermal Insulator ◽  
Independent Determination ◽  
Lateral Temperature ◽  
Lateral Heat

It is well known that the thermal parameters of materials confined in thin layers may significantly differ from their bulk value. Lateral heat diffusion thermoreflectance experiment is a very powerful tool for determining directly the thermal diffusivity of bulk materials and of layered structure. Nevertheless, in the latter case, experimental data are fitted with the help of a heat diffusion model in which the layer thermal conductivity and thermal diffusivity are taken together into consideration. In this paper, we show that both parameters can be determined independently, in the case of a thermal conductive layer deposited on a thermal insulator, with a careful analysis of the amplitude and the phase of the lateral temperature field associated to a point source.

scholarly journals INVESTIGATION OF MEASUREMENT ACCURACY IN DETERMINING THE MASS OF BULK MATERIALS

2020 ◽  
Vol 8 (2) ◽  
pp. 42-48
Author(s):  
Galina V. Simonova
Keyword(s):  
Bulk Density ◽  
Fractional Composition ◽  
Bulk Material ◽  
Indirect Measurement ◽  
Bulk Materials ◽  
Technological Processes ◽  
Measurement Results ◽  
Accuracy Of Measurement ◽  
Fractional Control

The article is devoted to the assessment the error in determining the mass of a sample bulk materials when using the values of their bulk density. Precisely the accuracy of measurement results is necessary in many fields of activity to ensure the efficiency and safety of technological processes, as well as improving product quality. The relevance of this work is associated with the assessment of the inevitable deviations of the bulk density the same material in a given volume as a result of an uncontrolled fractional composition of a sample of bulk material. As a consequence of these deviations, an error arises in determining the mass of a sample of a given volume, even if this volume is an uniquely determined quantity. The paper presents the results of studies of the influence of the fractional composition of bulk materials on the determination of their mass in the indirect measurement method. A significant effect of the fractional composition of bulk materials on the error of the indirect method for determining the mass of the sample was revealed. It is shown, that there is a need for fractional control of the composition of bulk materials in the development of control operations of technological processes, as well as restrictions on the use of bulk density with increased requirements for the accuracy of determining the mass of a sample.

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