The influence of coolant velocity on the local heat transfer coefficient during steel quenching

Artur Szajding1, Andrzej Gołdasz1, Tadeusz Telejko1

1AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland

DOI:

https://doi.org/10.7494/cmms.2020.4.0737

Abstract:

The results of the calculations of the local heat transfer coefficient HTC and a heat flux HF on the face of a cylindrical sample made of 1.0503 steel are presented. The sample was cooled from a temperature of approx. 930°C in a mineral oil having a temperature equal to 50°C. The experiments were performed for three speeds of the oil stream (0.2, 0.4 and 0.6 m/s). The oil stream was directed perpendicularly to the cooled surface. The temperature of each sample was measured with 4 thermocouples and recorded with a frequency of 10 Hz. The maximum values of HTC always occurred in the axis of the sample and were in the range of 8000 to 10,000 W/(m2 K). The results are presented in the form of useful graphs showing the dependence of HTC and HF on the surface temperature for various velocities of cooling oil. The calculations were made with self-developed software using the inverse solution of the boundary heat conduction problem.

Cite as:

Szajding, A., Gołdasz, G., & Telejko, T. (2020). The influence of coolant velocity on the local heat transfer coefficient during steel quenching. Computer Methods in Materials Science,20(4), 157–164. https://doi.org/10.7494/cmms.2020.4.0737

Article (PDF):

Key words:

Inverse method, Heat transfer coefficient, Boundary condition, Quenching

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