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Transient Subcooled Boiling in Minichannels: Experimental Study and Numerical Modelling Using Trefftz Functions and ADINA

Author

Listed:
  • Beata Maciejewska

    (Faculty of Management and Computer Modelling, Kielce University of Technology, 25-314 Kielce, Poland)

  • Magdalena Piasecka

    (Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, 25-314 Kielce, Poland)

  • Paweł Łabędzki

    (Faculty of Management and Computer Modelling, Kielce University of Technology, 25-314 Kielce, Poland)

Abstract

This study focuses on the phenomenon of boiling heat transfer during fluid flow (Fluorinert FC-72) in minichannels. The research stand was built around a specially designed test section incorporating sets of aligned minichannels, each 1 mm deep. These channel arrays varied in number, comprising configurations with 7, 15, 17, 19, 21, and 25 parallel channels. The test section was vertically orientated with upward fluid flow. To address the heat transfer problem associated with transient flow boiling, two numerical approaches grounded in the finite element method (FEM) were employed. One used the Trefftz function formulation, while the other relied on simulations performed using the commercial software ADINA (version 9.2). In both approaches, the heat transfer coefficient at the interface between the heated foil and the working fluid was determined by applying a Robin-type boundary condition, which required knowledge of the temperatures in both the foil and the fluid, along with the temperature gradient within the foil. The outcomes of both FEM-based models, as well as those of a simplified 1D method based on Newton’s cooling law, yielded satisfactory results.

Suggested Citation

  • Beata Maciejewska & Magdalena Piasecka & Paweł Łabędzki, 2025. "Transient Subcooled Boiling in Minichannels: Experimental Study and Numerical Modelling Using Trefftz Functions and ADINA," Energies, MDPI, vol. 18(14), pages 1-21, July.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:14:p:3865-:d:1705902
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    References listed on IDEAS

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    1. Magdalena Piasecka & Beata Maciejewska & Paweł Łabędzki, 2020. "Heat Transfer Coefficient Determination during FC-72 Flow in a Minichannel Heat Sink Using the Trefftz Functions and ADINA Software," Energies, MDPI, vol. 13(24), pages 1-25, December.
    2. Dou, Fangfang & Li, Zi-Cai & Chen, C.S. & Tian, Zhaolu, 2018. "Analysis on the method of fundamental solutions for biharmonic equations," Applied Mathematics and Computation, Elsevier, vol. 339(C), pages 346-366.
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