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Flow Past Heated Bluff Bodies

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Imaging Heat and Mass Transfer Processes

Part of the book series: SpringerBriefs in Applied Sciences and Technology ((BRIEFSTHERMAL,volume 4))

Abstract

Wakes behind heated cylinders, circular and square, have been experimentally investigated at low Reynolds numbers. The electrically heated cylinder is mounted in a vertical airflow facility such that the buoyancy aids the inertia of the main flow. The dimensionless parameters, namely, Reynolds number and Richardson number, are varied to examine flow behavior over a range of experimental conditions from the forced to the mixed convection regime. Laser schlieren has been used for visualization and analysis of the flow structures. The complete vortex-shedding sequence has been recorded using a high-speed camera. The dynamical characteristics of the vortical structures—their size, shape and phase, Strouhal number, and power spectra—are reported. On heating, the changes in the organized structures with respect to shape, size, and their movement are readily perceived from the instantaneous schlieren images before they reduce to a steady plume. The effect of cylinder orientation and oscillation on the wake are also discussed.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Pradipta Kumar Panigrahi & Krishnamurthy Muralidhar

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  1. Pradipta Kumar Panigrahi
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  2. Krishnamurthy Muralidhar
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Panigrahi, P.K., Muralidhar, K. (2013). Flow Past Heated Bluff Bodies. In: Imaging Heat and Mass Transfer Processes. SpringerBriefs in Applied Sciences and Technology(), vol 4. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4791-7_2

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  • DOI: https://doi.org/10.1007/978-1-4614-4791-7_2

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