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An experimental test of the Mocikat-Herwig theory of local turbulent heat transfer measurements on cold objects

Kapitz, Marek; Wiesche, Stefan aus der; Kadic, Samir; Strehle, Steffen

Abstract:

Experimental results are presented of a test of the theory of local turbulent heat transfer measurements proposed by Mocikat and Herwig in 2007. A miniaturized multi-layer heat transfer sensor was developed and employed in this study. The new heat transfer sensor was designed to work in air and liquids, and this capability enabled the simultaneous investigation of different Prandtl numbers. Two basic configurations, namely the flow past a blunt plate and the flow past an inclined square cylinder, were investigated in test sections of wind and water tunnels. Convective heat transfer coefficients were obtained through conventional testing (i.e., employing thoroughly heated test objects) and using the new miniaturized sensor approach (i.e., utilizing cold test objects without heating). The main prediction of the Mocikat-Herwig theory that a specific thermal adjustment coefficient of the employed actual miniaturized heat transfer sensor should exist in the fully turbulent flow regime was proven for developed two-dimensional flow. The observed effect of the Prandtl number on this coefficient was in good agreement with the prediction of the asymptotic expansion method. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000141357
Veröffentlicht am 18.12.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 0947-7411, 1432-1181
KITopen-ID: 1000141357
HGF-Programm 38.02.02 (POF IV, LK 01) Components and Cells
Erschienen in Heat and mass transfer
Verlag Springer
Band 58
Seiten 1041–1055
Vorab online veröffentlicht am 26.11.2021
Nachgewiesen in Scopus
Web of Science
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