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Photothermal radiometry applied to characterization and control of thermal contact resistance of crimped metals; Radiometrie photothermique appliquee a la caracterisation et au controle de la resistance thermique de contact de metaux sertis

Thesis/Dissertation:

Abstract

Modulated photothermal radiometry is used to study the thermal contact between two metals. At first, two models using a bidimensional axisymmetric geometry are proposed to describe the interface: the first one deals with thermal contact resistance, the second one with an equivalent layer. A thorough calculation of the photothermal signal taking into account the nature of the sample and the detection is here presented. Theoretical simulations show the influence of several parameters (frequency. dimensions of the excitation and the detection) on the sensitivity of the method applied to the detection of the thermal resistance. The comparison, with a three layer-model justifies the use of thermal resistance in periodical regime, for air layers between metals. Then, we present an experimental device that is used to validate the model. The results, obtained on duralumin-copper samples, show the sensitivity of the method and lead us to propose values of thermal contact resistance for different crimpings. At last an industrial testing equipment is described. The results, obtained on laboratory samples, are confirmed. Heat exchanger pipes, including voluntary defects are tested. Thanks to this device, we are able to make an in situ crimping control that can also be applied to other types of contacts.  More>>
Publication Date:
Nov 15, 1989
Product Type:
Thesis/Dissertation
Report Number:
FRNC-TH-9816
Resource Relation:
Other Information: 106 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS-NKM website for current contact and E-mail addresses: http://www.iaea.org/inis/Contacts/; Also available from Bibliotheque Universitaire, 9 Boulevard de la Paix, 51100 Reims (France); Energetique
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; 42 ENGINEERING; COMPUTERIZED SIMULATION; COPPER; DURALUMIN; HEAT EXCHANGERS; HEAT RESISTANT MATERIALS; INTERFACES; METALS; SENSITIVITY
OSTI ID:
22630268
Research Organizations:
Universite de Reims Champagne - Ardenne, 9 Boulevard de la Paix, 51100 Reims (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR1702406078421
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
198 page(s)
Announcement Date:
Oct 18, 2017

Thesis/Dissertation:

Citation Formats

Van Schel, Etienne. Photothermal radiometry applied to characterization and control of thermal contact resistance of crimped metals; Radiometrie photothermique appliquee a la caracterisation et au controle de la resistance thermique de contact de metaux sertis. France: N. p., 1989. Web.
Van Schel, Etienne. Photothermal radiometry applied to characterization and control of thermal contact resistance of crimped metals; Radiometrie photothermique appliquee a la caracterisation et au controle de la resistance thermique de contact de metaux sertis. France.
Van Schel, Etienne. 1989. "Photothermal radiometry applied to characterization and control of thermal contact resistance of crimped metals; Radiometrie photothermique appliquee a la caracterisation et au controle de la resistance thermique de contact de metaux sertis." France.
@misc{etde_22630268,
title = {Photothermal radiometry applied to characterization and control of thermal contact resistance of crimped metals; Radiometrie photothermique appliquee a la caracterisation et au controle de la resistance thermique de contact de metaux sertis}
author = {Van Schel, Etienne}
abstractNote = {Modulated photothermal radiometry is used to study the thermal contact between two metals. At first, two models using a bidimensional axisymmetric geometry are proposed to describe the interface: the first one deals with thermal contact resistance, the second one with an equivalent layer. A thorough calculation of the photothermal signal taking into account the nature of the sample and the detection is here presented. Theoretical simulations show the influence of several parameters (frequency. dimensions of the excitation and the detection) on the sensitivity of the method applied to the detection of the thermal resistance. The comparison, with a three layer-model justifies the use of thermal resistance in periodical regime, for air layers between metals. Then, we present an experimental device that is used to validate the model. The results, obtained on duralumin-copper samples, show the sensitivity of the method and lead us to propose values of thermal contact resistance for different crimpings. At last an industrial testing equipment is described. The results, obtained on laboratory samples, are confirmed. Heat exchanger pipes, including voluntary defects are tested. Thanks to this device, we are able to make an in situ crimping control that can also be applied to other types of contacts. [French] La radiometrie photothermique est utilisee pour etudier le contact thermique entre deux metaux. Tout d'abord, deux modeles utilisant une geometrie bidimensionnelle axisymetrique sont proposes pour decrire l'interface: le premier utilise une resistance thermique de contact, le second un milieu equivalent Un calcul complet du signal photothermique, prenant en compte la nature de l'echantillon et de la detection, est presente. Des simulations theoriques montrent l'influence de quelques parametres (frequence, dimensions de l'excitation et de la detection) sur la sensibilite de la methode a la detection de la resistance thermique. La comparaison, avec un modele a trois couches, valide la notion de resistance thermique en regime periodique, au moins dans le cas de lames d'air entre metaux. Ensuite, nous presentons le dispositif experimental utilise pour valider le modele. Les resultats, obtenus sur des echantillons de duralumin-cuivre, montrent la sensibilite de la methode et permettent de proposer des valeurs de la resistance thermique de contact pour differents sertissages. Enfin, un dispositif industriel de controle est decrit. Les resultats, obtenus sur les echantillons de laboratoire, sont confirmes. Des tubes d'echangeurs, comportant des defauts volontairement crees, sont testes. Ce dispositif est capable de faire un controle in situ du sertissage mais peut egalement etre utilise pour d'autres types de contact.}
place = {France}
year = {1989}
month = {Nov}
}