MODELING AND OPTIMIZATION OF PROCESSES OF SHAPING OF PASTAS IN CHANNELS OF MATRICES OF STEP-VARIABLE SECTION
Abstract
Currently velocity unevenness of forming pasta matrix over the cross section is an unsolved problem, both in domestic and in international practice.
The construction of the matrix is one of the key factors influencing technical and economic indicators of pressing work. The matrix includes a cylindrical body with wells located on concentric circles, liners mounted within wells, shaping with through holes that are grouped in the nests.
The aim of the work was to develop a methodology and establish it by the ratio between plastic and viscous components of the total hydrodynamic resistance in the flow of pasta dough in the channel of step-variable cross-section. The technique of determining the minimum pressure of the molding that is required to overcome the yield stress in shear (ultimate shear resistance) pasta in the channel of circular, annular, rectangular and arbitrary cross-sections, is developeds. Computational evaluation of this pressure in the molding of the dough of first and higher grades and test on the basis of polyrope used for industrial types and sizes of channels with stepped variable cross-section is made. It is shown that in general the hydrodynamic resistance is dominated by the contribution of the component due to viscous shear deformation in the course. An approximate method of estimating the speed and power of flow parameters pasta in the channels of step-variable cross section using the model of Bingam is proposed. The research results can be used in the design of the forming equipment, as well as in the development of methods of calculation of processes of formation and pasta dough.
The construction of the matrix is one of the key factors influencing technical and economic indicators of pressing work. The matrix includes a cylindrical body with wells located on concentric circles, liners mounted within wells, shaping with through holes that are grouped in the nests.
The aim of the work was to develop a methodology and establish it by the ratio between plastic and viscous components of the total hydrodynamic resistance in the flow of pasta dough in the channel of step-variable cross-section. The technique of determining the minimum pressure of the molding that is required to overcome the yield stress in shear (ultimate shear resistance) pasta in the channel of circular, annular, rectangular and arbitrary cross-sections, is developeds. Computational evaluation of this pressure in the molding of the dough of first and higher grades and test on the basis of polyrope used for industrial types and sizes of channels with stepped variable cross-section is made. It is shown that in general the hydrodynamic resistance is dominated by the contribution of the component due to viscous shear deformation in the course. An approximate method of estimating the speed and power of flow parameters pasta in the channels of step-variable cross section using the model of Bingam is proposed. The research results can be used in the design of the forming equipment, as well as in the development of methods of calculation of processes of formation and pasta dough.
About the Authors
V. Ya. Grudanov
Belarusian State Agrarian Technical University
Belarus
D. Sc. (Engineering), Professor, Professor of Technology and Logistics Processes, Processing of Agricultural Products.
Belarus
D. Sc. (Engineering), Professor, Professor of Technology and Logistics Processes, Processing of Agricultural Products.
A. B. Torhan
Belarusian State Agrarian Technical University
Belarus
Ph. D, (Engineering), Assistant Professor of Technology and Logistics Processes, Processing of Agricultural Products.
Belarus
Ph. D, (Engineering), Assistant Professor of Technology and Logistics Processes, Processing of Agricultural Products.
L. T. Tkachyova
Belarusian State Agrarian Technical University
Belarus
Ph. D., (Engineering), Assistant Professor, Assistant Professor of Department of Health and Safety.
Belarus
Ph. D., (Engineering), Assistant Professor, Assistant Professor of Department of Health and Safety.
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