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Application of the Temperature Oscillation Method to Laminar Flow in Straight Horizontal and Curved Minichannels

Author

Listed:
  • Stanislav Solnař

    (Department of Process Engineering, Faculty of Mechanical Engineering, Czech Technical University in Prague, 16000 Prague, Czech Republic)

  • Stefan Haase

    (Department of Chemical Reaction Engineering and Process Plants, Technische Universitat Dresden, 01069 Dresden, Germany)

  • Tomáš Jirout

    (Department of Process Engineering, Faculty of Mechanical Engineering, Czech Technical University in Prague, 16000 Prague, Czech Republic)

Abstract

This work deals with the application of the temperature oscillation method to measure local values of the heat transfer coefficient in laminar flow in a straight horizontal pipe and in a pipe with a bend. This method, applied here for the first time in such experimental conditions, uses a time-varying heat flux as a boundary condition, which is a condition of the third kind. Since an analytical solution for such conditions could not be identified in the existing literature, a numerical study of this problem is applied here. Experimental data for a straight horizontal pipe confirm the numerical results within a reasonable level of error. Experimental measurements on a straight horizontal tube are consistent with predicted results in the literature for both total and local heat transfer coefficient values. The measurements on bent tubes show a very significant influence on the local values compared to the straight tube and in the overall values this change appears as an increase in the heat transfer coefficient.

Suggested Citation

  • Stanislav Solnař & Stefan Haase & Tomáš Jirout, 2023. "Application of the Temperature Oscillation Method to Laminar Flow in Straight Horizontal and Curved Minichannels," Energies, MDPI, vol. 16(4), pages 1-20, February.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:4:p:1714-:d:1062588
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    References listed on IDEAS

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    1. Lazarus Godson Asirvatham & Nandigana Vishal & Senthil Kumar Gangatharan & Dhasan Mohan Lal, 2009. "Experimental Study on Forced Convective Heat Transfer with Low Volume Fraction of CuO/Water Nanofluid," Energies, MDPI, vol. 2(1), pages 1-23, March.
    2. Wei Liu & Miao Gui & Yudong Zha & Zengyao Li, 2023. "Numerical Investigation of the Effect of Surface Wettability and Rotation on Condensation Heat Transfer in a Sludge Dryer Vertical Paddle," Energies, MDPI, vol. 16(2), pages 1-15, January.
    3. Dingming Zheng & Lei Su & Haoyu Ou & Shijie Ruan, 2022. "Study on Heat Transfer Characteristics and Performance of the Full Premixed Cauldron Stove with Porous Media," Energies, MDPI, vol. 15(24), pages 1-23, December.
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