Publication detail

Methodology of Evaluation of Heat Transfer Experiment on Aluminum sample

KOMÍNEK, J. HŘIBOVÁ, V. POHANKA, M.

Original Title

Methodology of Evaluation of Heat Transfer Experiment on Aluminum sample

English Title

Methodology of Evaluation of Heat Transfer Experiment on Aluminum sample

Type

conference paper

Language

en

Original 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.

English 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

RIV year

2015

Released

03.06.2015

Publisher

TANGER

Location

Ostrava

ISBN

978-80-87294-58-1

Book

METAL 2015 Full Texts of Papers

Pages from

1

Pages to

6

Pages count

6

BibTex


@inproceedings{BUT114786,
  author="Jan {Komínek} and Veronika {Hřibová} and Michal {Pohanka}",
  title="Methodology of Evaluation of Heat Transfer Experiment on Aluminum sample",
  annote="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.",
  address="TANGER",
  booktitle="METAL 2015 Full Texts of Papers",
  chapter="114786",
  howpublished="electronic, physical medium",
  institution="TANGER",
  year="2015",
  month="june",
  pages="1--6",
  publisher="TANGER",
  type="conference paper"
}