Browsing by Subject "inverse method"

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Access status: Open Access ,
The effect of the assumed thermophysical properties of steel on the heat transfer calculation result in contact phenomena
(Wydawnictwa AGH, 2020) Rywotycki, Marcin; Malinowski, Zbigniew; Przyłucka, Aleksandra; Sołek, Krzysztof
The article presents a model of heat transfer between two solid surfaces remaining in contact under the effect of the force applied. The presented results were obtained from the authors' own studies conducted with the application of a new method of determining the heat flux transferred between these surfaces. The method consists of two stages: the experiment and numerical calculations. The experimental tests include temperature measurements in specific points in two samples remaining in contact with each other. The numerical part uses the inverse solution and the finite element method for the calculation of the heat flux on the contact surface. An analysis was performed on the effect of the steel grade used in the tests on the result of heat transfer determination in contact phenomena. The calculations were conducted with the application of proprietary software using the inverse method integrated with FEM.
Access status: Open Access ,
The influence of coolant velocity on the local heat transfer coefficient during steel quenching
(Wydawnictwa AGH, 2020) Szajding, Artur; Gołdasz, Andrzej; Telejko, Tadeusz
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 m/s, 0.4 m/s 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.