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Experimental and Numerical Study of Multiple Jets Impinging a Step Surface

Author

Listed:
  • Flavia V. Barbosa

    (MEtRICs I&D Centre, School of Engineering, University of Minho, 4800-058 Guimarães, Portugal)

  • Senhorinha F. C. F. Teixeira

    (ALGORITMI I&D Centre, School of Engineering, University of Minho, 4800-058 Guimarães, Portugal)

  • José C. F. Teixeira

    (MEtRICs I&D Centre, School of Engineering, University of Minho, 4800-058 Guimarães, Portugal)

Abstract

Multiple jet impingement is a widely implemented convective process for enhancing heat transfer over target surfaces. Depending on the engineering application, the impinging plate can have different configurations. However, the increased complexity of the surface induces complicated thermal behaviors that must be analyzed. In that sense, this study consisted of the experimental and numerical analysis of multiple jets impinging on a step surface. A particle image velocimetry technique was applied to measure velocity fields, while a heat flux sensor was mounted on the surface to determine the heat transfer. Numerical simulations, for both flat and non-flat plates, were conducted in ANSYS FLUENT applying the SST k-ω model, and experimental results were used to validate the model. Three surface configurations were analyzed, flat, 1 D , and 2 D steps, and the results show an increase in the average Nusselt number compared with the flat plate, 9% and 20%, respectively. This increase was mainly due to the intensification of the flow turbulence induced by the step. Numerical results were in good agreement with the experiments, but the heat transfer was slightly underpredicted for the 2 D step case due to the difficulty of predicting with accuracy the velocity field near the step.

Suggested Citation

  • Flavia V. Barbosa & Senhorinha F. C. F. Teixeira & José C. F. Teixeira, 2021. "Experimental and Numerical Study of Multiple Jets Impinging a Step Surface," Energies, MDPI, vol. 14(20), pages 1-23, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6659-:d:656398
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    References listed on IDEAS

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    1. Zhong Ren & Xiaoyu Yang & Xunfeng Lu & Xueying Li & Jing Ren, 2021. "Experimental Investigation of Micro Cooling Units on Impingement Jet Array Flow Pressure Loss and Heat Transfer Characteristics," Energies, MDPI, vol. 14(16), pages 1-21, August.
    2. Abdulrahman H. Alenezi & Abdulrahman Almutairi & Hamad M. Alhajeri & Abdulmajid Addali & Abdelaziz A. A. Gamil, 2018. "Flow Structure and Heat Transfer of Jet Impingement on a Rib-Roughened Flat Plate," Energies, MDPI, vol. 11(6), pages 1-16, June.
    3. Myriam Slama & Camille Choma Bex & Grégory Pinon & Michael Togneri & Iestyn Evans, 2021. "Lagrangian Vortex Computations of a Four Tidal Turbine Array: An Example Based on the NEPTHYD Layout in the Alderney Race," Energies, MDPI, vol. 14(13), pages 1-23, June.
    4. Marcos André de Oliveira & Paulo Guimarães de Moraes & Crystianne Lilian de Andrade & Alex Mendonça Bimbato & Luiz Antonio Alcântara Pereira, 2020. "Control and Suppression of Vortex Shedding from a Slightly Rough Circular Cylinder by a Discrete Vortex Method," Energies, MDPI, vol. 13(17), pages 1-23, August.
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