Abstract
The numerical simulation results of the flow of a gas-liquid medium over the high-temperature metal cylinder surface in a circular channel are presented. The flow over the solid metal cylinder with a variable cross-section by a gas-liquid medium is considered. Based on the mathematical model taking into account the cooling-media-flow axial symmetry relative to the cylinder longitudinal axis, the results of the numerical simulation of the process of solving the two-dimensional nonstationary problem of the coupled heat exchange of the gas-liquid medium flow and metal cylinder are obtained. The control volume approach is used for solving the differential equation system. The flow field parameters are calculated using the algorithm SIMPLE. For the iterative solution of linear algebraic equations, Gauss-Seidel method with under-relaxation is used. The numerical calculation results are obtained for the flow hydrodynamic parameters of the gas-liquid medium at cooling the high-temperature metal cylinder by taking into account vaporization. The values of temperatures, flow velocities, and vapour distribution in the computational domain are determined. The variation intensity of the metal cylinder surface temperature depending on the gas-liquid flow velocity is analyzed.
Highlights
In metallurgy and engineering industry in the production of items from metals and alloys, the creation of rational conditions for cooling processed high-temperature metal bodies is an important problem in the procedures of strengthening of machine components
The selection of the heat-transfer properties of cooling media and methods and modes of their supply during cooling depend on the required cooling rate which is determined by the intensity of the heat transfer between a body and a medium
Using the mathematical model of the gas-liquid medium flow moving over the heated surface of the hightemperature metal cylinder with the variable crosssection, the numerical values of the temperature, gasliquid medium flow velocity and distribution of the vapor concentration in the computational domain have been obtained
Summary
In metallurgy and engineering industry in the production of items from metals and alloys, the creation of rational conditions for cooling processed high-temperature metal bodies is an important problem in the procedures of strengthening of machine components. The formation of the required conditions of heat removal during the heat treatment of items from metals and alloys is paid much attention to The works in this direction were conducted by N.V. Zimin, G.F. Golovin, D.B. Budrin, M.V. Kondratov, G.N. Kheyfets, A.C. Kadinova, Yu.G. Eysmond, V.G. Labeysh, K.Z. Shepelyakovskiy et al The investigation results allowed to create a general pattern for the process of the cooling of heated metal workpieces at thermal treatment. Practically in all the works, particular solutions and general conclusions are given only in a certain required range of cooling operation conditions for the standard set of properties of the workpiece material and cooling media. In this connection it is still important to conduct research studies in this direction
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