DOI: 10.52150/2522-9117-2025-39-07
V. H. Razdobrieiev1, Ph. D. (Tech.), Senior Researcher, ORCID 0000-0001-7402-7992
M. V. Kuvaiev2, Ph. D. (Tech.), Researcher, ORCID 0000-0002-8560-5433
1 Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine, Academican Starodubova Square, 1, Dnipro, 49107, Ukraine
2 Institute of Transport Systems and Technologies National Academy of Sciences of Ukraine, Pysarzhevskoho Str., 5, Dnipro, 49000, Ukraine
* Corresponding author: v_razdobreev@ukr.net
CALCULATION OF THE HEAT TRANSFER COEFFICIENT WHEN SIMULATING THE PROCESS OF FORCED COOLING OF ROLLED ROLLS IN A WATER FLOW
Abstract. In today’s world of fierce competition between manufacturers of finished rolled metal, more and more attention is paid to saving energy and materials for its production, and improving the quality of the final product. One of the most effective ways to improve the quality of mass-produced rolled products made of carbon and low-alloy steels, which significantly increases the mechanical properties and performance characteristics of products made from it and provides significant metal savings in various industries, is heat treatment and its varieties, for example, thermomechanical treatment. Due to the high technical and economic efficiency of using thermomechanical strengthening of rolled steel using the heat of rolling heating and the resulting significant savings in energy resources along with an increase in the complex of service properties of steel compared to classical heat treatment with separate heating. Therefore, modern new and reconstructed rolling mills are equipped with cooling devices for thermomechanical processing of rolled products in the rolling mill stream. The cooling medium is process water. The most economical and sufficiently effective means of studying the process of forced cooling of long-rolled products is mathematical modeling of such a process. At the same time, the mathematical description of the interaction between hot rolled steel, which has a temperature higher than +1000 °C, and water, which has a temperature not higher than +40 °C and is part of the mathematical model of the forced cooling process of long rolled steel, is complex. Heat exchange between hot rolled steel and coolant at the interface of these substances is physically characterized by the heat transfer coefficient α. The purpose of the research is to refine the calculation of the heat transfer coefficient in mathematical modeling of the process of forced cooling of rolled steel. It has been established that the increase in the heat transfer coefficient occurs with an increase in the temperature of the cooling water and a shift in the temperature of the rolled metal, at which the maximum of the heat transfer coefficient is observed – the transition from bubble to film boiling, to the region of lower temperatures of the rolled metal surface. This, in turn, makes it possible to additionally use knowledge of the water temperature at the inlet and outlet of the cooling device to adjust and control the process of forced cooling of rolled metal in the long-rolling mill line.
Key words: heat transfer coefficient, forced cooling of long rolled steel, mathematical modeling, water boiling mode, film boiling, bubble boiling.
For citation: Razdobrieiev V. H., Kuvaiev M. V. Calculation of the heat transfer coefficient when simulating the process of forced cooling of rolled rolls in a water flow. Fundamental and applied problems of ferrous metallurgy, 39, 135-147. https://doi.org/10.52150/2522-9117-2025-39-07
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Received 20.07.2025
Accepted 21.10.2025
Published online 01.12.2025
