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Efficient thermal management is essential for technological progress, emphasizing the need to “Increase power-decrease size.” This paper investigates flow boiling as a method for rapid heat removal. Employing an Eulerian multiphase RPI boiling model, the study focuses on a ribbed pipe to analyze heat transfer characteristics. The investigation spans twelve cases with varying rib pitches (125, 250, and 500 mm). The pipe, with a length of 2.0 m and a diameter of 15.4 mm, undergoes a subcooled water mass flux rate of 900 kg/m2-s. It is subjected to heat flux values of 484.5, 570, and 655.5 kW. Results reveal fluctuations in wall and centerline fluid temperatures, vapor fraction, and pressure along the axial position. The temperature variations near the rib surface unveil a nuanced heat accumulation phenomenon influenced by fluid dynamics and global mixing. Vapor fraction profiles differ for smooth and ribbed pipes, highlighting enhanced boiling in the latter due to increased surface complexity and improved fluid mixing. Pressure drop variations in ribbed pipes result from dynamic interactions among fluid acceleration, frictional losses, and phase change processes.

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Thermohydraulic Performance Investigation of Flow Boiling in Ribbed Pipe Using Eulerian Multiphase Model

  • 会议论文

  • 发表日期：

    2025年

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  • Ankur Haldar,
  • L. Varshney

摘要

Efficient thermal management is essential for technological progress, emphasizing the need to “Increase power-decrease size.” This paper investigates flow boiling as a method for rapid heat removal. Employing an Eulerian multiphase RPI boiling model, the study focuses on a ribbed pipe to analyze heat transfer characteristics. The investigation spans twelve cases with varying rib pitches (125, 250, and 500 mm). The pipe, with a length of 2.0 m and a diameter of 15.4 mm, undergoes a subcooled water mass flux rate of 900 kg/m2-s. It is subjected to heat flux values of 484.5, 570, and 655.5 kW. Results reveal fluctuations in wall and centerline fluid temperatures, vapor fraction, and pressure along the axial position. The temperature variations near the rib surface unveil a nuanced heat accumulation phenomenon influenced by fluid dynamics and global mixing. Vapor fraction profiles differ for smooth and ribbed pipes, highlighting enhanced boiling in the latter due to increased surface complexity and improved fluid mixing. Pressure drop variations in ribbed pipes result from dynamic interactions among fluid acceleration, frictional losses, and phase change processes.