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Oscillatory thermal structures in a reattaching jet flow

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Abstract

Spatially varying surface temperature oscillations in a nominally steady reattaching slot jet at a Reynolds number (Re) of 5000 are analyzed using Proper Orthogonal Decomposition (POD) for two nozzle-to-surface spacings, and three exit openings of the nozzle. The surface temperature data in these experiments were recorded using infrared thermography at a frequency of 20 Hz along two selected lines on the impingement surface corresponding to geometrically similar and dissimilar regions within the reattachment curtain. The magnitude of temperature oscillations were found to increase with an increase in exit opening for the larger nozzle spacing. The POD analysis results indicate that a majority of the temperature flucutations are well captured by 15 dominant modes. In many cases, the three dominant modes accounted for approximately 60 percent of the variance in surface temperature fluctuation.

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Authors and Affiliations

  1. School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, 204 Rogers Hall, 97331-6001, Corvallis, Oregon, USA

    Narayanan V.

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  1. Narayanan V.
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Correspondence to Narayanan V..

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Vinod Narayanan: He received his Ph.D. in Mechanical Engineering from Texas A&M University in 2001. Since 2001, he has been an Assistant Professor at Oregon State University, Corvallis, USA. He has worked for over 10 years in the field of jet impingement flow and heat transfer for thermal management and drying applications, and in non-intrusive thermal and flow imaging and measurements. His current research interests include experimental studies of microscale single and two-phase flows, and the use of passive means to enhance fluid and thermal transport.

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Narayanan, V. Oscillatory thermal structures in a reattaching jet flow. J Vis 10, 389–396 (2007). https://doi.org/10.1007/BF03181897

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  • DOI: https://doi.org/10.1007/BF03181897

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