Tracking of coherent thermal structures on a heated wall by means of infrared thermography |
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Authors: | G Hetsroni T A Kowalewski B Hu A Mosyak |
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Institution: | (1) Department of Mechanical Engineering Technion – IIT, Haifa 32000 Israel, IL;(2) Polish Academy of Sciences IPPT PAN Swietokrzyska 21, 00-049 Warsaw, Poland e-mail: tkowale@ippt.gov.pl, PL |
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Abstract: | This paper deals with measurements of convective velocity of large-scale thermal structures, using the thin foil technique
and infrared thermography to visualize the thermal pattern on the wall. An image correlation method is proposed to track the
displacement of the observed thermal pattern. The idea of the method is similar to that of particle image velocimetry, but
the thermal patterns on the heated wall are used, rather than tracing particles. On this basis, the thermal patterns created
by the coherent structures of turbulent channel flow are examined. Particular attention is paid to the determination of the
optimal parameters of image acquisition, including spatial and temporal separation. An attempt is made to relate momentum
and scalar transport analyses by considering the propagation velocity of large-scale temperature structures. The proposed
technique appears to be an attractive alternative for non-intrusive analysis of turbulent flow, especially, where opaqueness
of channel walls excludes the use of optical methods.
Received: 18 January 2000/Accepted: 20 May 2000 |
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