scholarly journals Research on transient thermal process of a friction brake during repetitive cycles of operation

2017 ◽  
Author(s):  
Yanko Slavchev ◽  
Lubomir Dimitrov ◽  
Yavor Dimitrov
Keyword(s):  
Thermal Process ◽  
Transient Thermal ◽  
Friction Brake

scholarly journals Cylindrical body temperature field simulation which made in the transitional thermal process conditions out of polymer material

2020 ◽  
Vol 7 (3) ◽  
Author(s):  
Liliya Petrova ◽  
Tatyana Gavrilova
Keyword(s):  
Temperature Field ◽  
Heat Conduction ◽  
Body Temperature ◽  
Polymer Composite ◽  
Thermal Process ◽  
Cylindrical Body ◽  
Phase Delay ◽  
Process Conditions ◽  
Two Phase ◽  
Transient Thermal

The advancing requirements for strength, relaxation, thermophysical, electrical, and other structural elements characteristics actualizes the polymer composite material use for the soft part and node point manufacture, which improves performance index. This paper reported the need to take into account relaxation phenomena in predicting the body’s thermal field development that is made of polymeric materials, and the thermal relaxation time and the thermal damping time proportional to the duration of transient thermal process certain periods. In this article three-period thermal process in a cylindrical body mathematical model is presented. cylindrical body made of a low-heat-conducting material by using a heat conduction hyperbolic equation that is reflecting the heat flow relaxation and thermal damping phenomenon. A numerical solution to the problem of unsteady heat conduction in a circular disk for a two-phase delay equation is presented, which is based on the grid method implementation by using a three-layer implicit difference scheme and the finite difference method use. Calculation formulas for the run-through coefficients as well as the temperature values at the outer boundaries are concluded using the boundary conditions approximation for the intermediate and upper time layers, taking into account the multi-period of the process. The implementation of the modified run-through method when solving the non-stationary heat conduction problem in a cylindrical body, taking into account the finite heat propagation speed and thermal damping is described. The calculation results for the cylindrical body temperature field are obtained by using the polymethyl methacrylate example upon sudden heating based on a model with a two-phase delay. The results presented in this paper aid in an increase in predicting temperature field accuracy in polymer composite materials in the transient thermal processes study.

scholarly journals Numerical Analysis of the Non-Stationary Thermal State of the Tool in the Combined Casting and Extrusion of Non-Ferrous Metals 

2021 ◽  
Author(s):  
Alexander Petrovich Skuratov ◽  
Natal'ya Petrovna Popiyakova ◽  
Alexander Sergeevich Potapenko ◽  
Yuriy Vasilyevich Gorokhov ◽  
Mikhail Yur'yevich Kuchinskii ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Thermal Regime ◽  
Thermal Process ◽  
Rotation Speed ◽  
Thermal State ◽  
Unsteady Heat Transfer ◽  
Ferrous Metals ◽  
Transient Thermal ◽  
Temperature Time

Abstract The results of a numerical analysis of unsteady heat transfer in the "metal-mold-environment" system during continuous combined casting and extrusion of an aluminum alloy in an installation with a horizontal carousel mold are presented. The heat engineering zones characterized by different intensity of heat transfer between the melt and the surface of the mold have been determined. A quantitative assessment of the influence of the rate of heating of the crystallizer on the temperature-time characteristics during the period of the transient thermal process is given. It is shown that an increase in the productivity of the installation reduces the duration of the transient thermal process when starting the installation from a cold state until it reaches a stationary thermal regime. The dependence of the time at which the installation reaches the stationary thermal regime on the rotation speed of the crystallizer wheel has been obtained.

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