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A study of surface temperature and heat flux estimations in heating processes by solving an Inverse Heat Conduction Problem
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

The topic of this thesis is estimation of the dynamic changes of the surface temperatureand heat flux during heating processes by using an inverse method. The local transient surface temperature and heat flux of a steel slab are calculated based on measurements in the interior of the slab.

The motivations for using an inverse method may be manifold. Sometimes, especially in the field of thermal engineering, one wants to calculate the transient temperature or heat flux on the surface of a body. This body may be a slab, or billet in metallurgical applications. However, it may be the case that the surface for some reason is inaccessible to exterior measurements with the aid of some measurement device. Such a device could be a thermocouple if contact with the surface in question is possible or a pyrometer if an invasive method is preferred. Sometimes though, these kinds of devices may be an inappropriate choice. It could be the case that the installation of any such device may disturb the experiment in some way or that the environment is chemically destructive or just that the instruments might give incorrect results. In these situations one is directed to using an inverse method based on interior measurements in the body, and in which the desired temperature is calculated by a numerical procedure.

The mathematical model used was applied to experimental data from a small scale laboratory furnace as well as from a full scale industrial reheating furnace and the results verified that the method can be successfully applied to high temperature thermal applications.

Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , ix, 21 p.
Series
KTH/MSE--05/92--SE+ENERGY/AVH
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-605ISBN: 91-7178-244-3 (print)OAI: oai:DiVA.org:kth-605DiVA: diva2:14597
Presentation
2006-02-07, Sal B3, Brinellvägen 23, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101124Available from: 2006-01-31 Created: 2006-01-31 Last updated: 2010-11-24Bibliographically approved
List of papers
1. Estimation of the transient surface temperature and heat flux of a steel slab using an inverse method
Open this publication in new window or tab >>Estimation of the transient surface temperature and heat flux of a steel slab using an inverse method
2007 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 27, no 14-15, 2463-2472 p.Article in journal (Refereed) Published
Abstract [en]

In the steel industry it is of great importance to be able to control the surface temperature and heating- or cooling rates during heat treatment processes. An experiment was performed in which a steel slab was heated up to 1250 degrees C in a fuel fired test furnace. The transient surface temperature and heat flux of a steel slab is calculated using a model for inverse heat conduction. That is, the time dependent local surface temperature and heat flux of a slab is calculated on the basis of temperature measurements in selected points of its interior by using a model of inverse heat conduction. Time- and temperature histories were measured at three points inside a steel slab. Measured temperature histories at the two lower locations of the slab were used as input to calculate the temperature at the position of the third location. A comparison of the experimentally measured and the calculated temperature histories was made to verify the model. The results showed very good agreement and suggest that this model can be applied to similar applications in the Steel industry or in other areas where the target of investigation for some reason is inaccessible to direct measurements.

Keyword
Heat transfer; Heat treatment; Inverse heat conduction; Slab; Steel processing; Heat conduction; Heat flux; Heat treatment; Iron and steel industry; Steel; Inverse heat conduction; Slab; Steel processing; Surface temperature; Temperature measurement
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-7804 (URN)10.1016/j.applthermaleng.2007.02.005 (DOI)000247865200015 ()2-s2.0-34248400756 (Scopus ID)
Note
QC 20100823Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2017-12-14Bibliographically approved
2. Estimation of the transient surface temperature, heat flux and effective heat transfer coefficient of a slab in an industrial reheating furnace by using an inverse method
Open this publication in new window or tab >>Estimation of the transient surface temperature, heat flux and effective heat transfer coefficient of a slab in an industrial reheating furnace by using an inverse method
2007 (English)In: Steel Research International, ISSN 1611-3683, Vol. 78, no 1, 63-70 p.Article in journal (Refereed) Published
Abstract [en]

In the steel industry it is of great importance to be able to control the surface temperature and heating or cooling rates during heat treatment processes. In this paper, a steel slab is heated up to 1300 degrees C in an industrial reheating furnace and the temperature data are recorded during the reheating process. The transient local surface temperature, heat flux and effective heat transfer coefficient of the steel slab ares calculated using a model for inverse heat conduction. The calculated surface temperatures are compared with the temperatures achieved by using a model of the heating process with the help of the software STEELTEMP (R) 2D. The results obtained show very good agreement and suggest that the inverse method can be applied to similar high temperature applications with very good accuracy.

Keyword
Heat transfer; Heat treatment; Ill-posed problems; Inverse heat conduction; Reheating furnace; Heat conduction; Heat flux; Heat transfer; Heat treating furnaces; Heat treatment; Mathematical models; Ill-posed problems; Inverse heat conduction; Reheating furnaces; Iron and steel industry
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-7805 (URN)000244328000010 ()2-s2.0-33846870559 (Scopus ID)
Note
QC 20100823Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2010-08-23Bibliographically approved

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