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Tracking of coherent thermal structures on a heated wall.

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Abstract

The temporal evolution of a thermal pattern observed on a heated wall by infrared camera is correlated with the propagation velocity of the thermal perturbations calculated by DNS. In the experiment the propagation velocity was measured by using PIV-based analysis of infrared images of the thermal pattern on the wall. To verify the experimental technique of image analysis, a sequence of synthetic images, simulating thermal patterns on the wall, was generated from the DNS solution, and the convective velocity was evaluated. It was found that the convective velocity of thermal structures obtained by PIV-based analysis of the experimental and synthetic images was in relatively good agreement with that calculated from the DNS solution. The present study confirmed that for a high Prandtl number fluid (water) the propagation velocity of the thermal perturbations is only about half of the convective velocity of the velocity perturbations. It was also found that the convection velocity observed for hot spots is distinctly lower than that for the cold spots.

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Acknowledgments

This research was supported by the Center for Absorption in Science of the Ministry of Immigrant Absorption (State of Israel). This research was also supported by the Fund for the Promotion of Research at the Technion. A. Mosyak was supported by the Committee for Planning and Budgeting of the Council for Higher Education under the framework of the KAMEA Program. The authors express their gratitude to Chenfeng Li for his help in extracting data from the DNS simulations.

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Authors and Affiliations

  1. IPPT PAN, Polish Academy of Sciences, Swietokrzyska 21, PL 00–049, Warszawa, Poland

    T. A. Kowalewski

  2. Department of Mechanical Engineering, Technion IIT, 32000 , Haifa, Israel

    A. Mosyak & G. Hetsroni

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  1. T. A. Kowalewski
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  2. A. Mosyak
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  3. G. Hetsroni
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Correspondence to T. A. Kowalewski.

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Kowalewski, T.A., Mosyak, A. & Hetsroni, G. Tracking of coherent thermal structures on a heated wall. . Exp Fluids 34, 390–396 (2003). https://doi.org/10.1007/s00348-002-0574-9

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  • DOI: https://doi.org/10.1007/s00348-002-0574-9

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