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<p>A static mixer is designed to facilitate fluid mixing in pipe flow reactors, especially at low velocities. Selecting the appropriate mixer requires a deep understanding of the desired flow and mixing behaviors, which are influenced by the mixer type, geometry, and fluid properties. This study was aimed at investigating the hydrodynamics and mixing behaviors of methanol-refined palm oil in two distinct static mixers, a Kenics static mixer (KSM) and a Lightnin static mixer (LSM), by using computational fluid dynamics (CFD). The Eulerian-Eulerian approach, which is based on the two-fluid model, was employed to simulate the flow behavior. The hydrodynamics of both static mixers were analyzed in detail. Compared with the LSM, the KSM resulted in less velocity fluctuation. The velocity of the system fluctuated less as the aspect ratio increased. However, the mixer scale had no significant effect on the velocity fluctuations, indicating that the geometry similarity scaling method is valid for scaling up static mixers. The residence time distribution (RTD), which is based on the virtual tracer method using CFD simulation, was studied. The E-curve was narrow, with a higher peak exhibiting increasing inlet velocity and aspect ratio levels or decreasing methanol inlet proportion and static mixer size values. Additionally, the axial dispersion model exhibited an excellent fit with the E-curve. The 1/Pe term tended to increase with increasing inlet velocity or decreases in the methanol inlet proportion and static mixer scale. However, the type of static mixer and the aspect ratio had insignificant effects on 1/Pe.</p>

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Hydrodynamic and Mixing Behavior of KSM and LSM Static Mixers Based on CFD Simulation

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Supakit Thongsong,
  • Kulchanat Prasertsit,
  • Songtham Photaworn,
  • Panut Bumphenkiattikul,
  • Parinya Khongprom

摘要

A static mixer is designed to facilitate fluid mixing in pipe flow reactors, especially at low velocities. Selecting the appropriate mixer requires a deep understanding of the desired flow and mixing behaviors, which are influenced by the mixer type, geometry, and fluid properties. This study was aimed at investigating the hydrodynamics and mixing behaviors of methanol-refined palm oil in two distinct static mixers, a Kenics static mixer (KSM) and a Lightnin static mixer (LSM), by using computational fluid dynamics (CFD). The Eulerian-Eulerian approach, which is based on the two-fluid model, was employed to simulate the flow behavior. The hydrodynamics of both static mixers were analyzed in detail. Compared with the LSM, the KSM resulted in less velocity fluctuation. The velocity of the system fluctuated less as the aspect ratio increased. However, the mixer scale had no significant effect on the velocity fluctuations, indicating that the geometry similarity scaling method is valid for scaling up static mixers. The residence time distribution (RTD), which is based on the virtual tracer method using CFD simulation, was studied. The E-curve was narrow, with a higher peak exhibiting increasing inlet velocity and aspect ratio levels or decreasing methanol inlet proportion and static mixer size values. Additionally, the axial dispersion model exhibited an excellent fit with the E-curve. The 1/Pe term tended to increase with increasing inlet velocity or decreases in the methanol inlet proportion and static mixer scale. However, the type of static mixer and the aspect ratio had insignificant effects on 1/Pe.