METHODOLOGY OF EVALUATION OF HEAT TRANSFER EXPERIMENT ON ALUMINUM SAMPLE

1 KOMÍNEK Jan
Co-authors:
1 HŘIBOVÁ Veronika 1 POHANKA Michal
Institution:
1 Brno University of Technology, Brno, Czech Republic, kominek@lptap.fme.vutbr.cz
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
1203-1208
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
276 views / 98 downloads
Abstract

Cooling is one of the critical points during aluminum casting. Improper cooling leads to a structure which isn't homogenous, full of internal and surface defects. It is necessary to know the boundary conditions (heat transfer coefficient or heat flux) for cooling optimization. The boundary conditions for different types of cooling are obtained from experiments.This article is focused on the cooling of vertical surfaces of aluminum by flat water jets. The sample initial temperature was close to the liquid state. The sample was cooled while in a vertical position by a flat water jet which hit the upper part of the cooling surface, and then the water flow down along the surface. The temperatures were recorded during the experiment by a set of thermocouples which were installed inside the sample. Thermocouples were placed closed to the cooled surface at different heights. The moving horizontal Leidenfrost front between nucleate and film boiling could be observed during the experiment. This front moved downward along the sample surface.The aim of this work is to evaluate the boundary conditions for described measurements. The evaluation held due to the solution of the 2D inverse task, similar to Beck’s sequential methods. The computation procedure was modified to be able to deal with the moving Leidenfrost front between low and height cooling intensities. Results are presented in a form of heat transfer coefficients as a function of position and temperature.

Keywords: Aluminum casting, 2D inverse task, heat transfer coefficients, sequential approach

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