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<p>Understanding heat transport in miniaturized thermal management devices is critical for high-power electronic systems. This study presents a novel visualization of internal two-phase flow within a meander-shaped low-fill heat pipe (MLFHP) using neutron radiography. The MLFHP, fabricated from aluminum with a serpentine microchannel structure and filled with only 10&#xa0;vol.% water, demonstrates remarkable heat transport performance despite the ultra-low filling ratio. We conducted non-invasive neutron imaging experiments at the JRR-3 reactor facility to investigate fluid motion and phase change behavior under various heat input conditions. The results reveal that liquid slugs travel unidirectionally from the heating to cooling sections without oscillatory behavior or reflux, unlike conventional pulsating heat pipes. Notably, effective heat transfer is achieved through latent heat without dry-out, even at high thermal loads. Unlike conventional pulsating heat pipes (PHPs), the MLFHP exhibits a novel, non-oscillatory two-phase transport mechanism. The findings provide new insight into the heat transfer mechanism of non-oscillating two-phase systems and highlight the effectiveness of neutron radiography in visualizing internal dynamics in opaque thermal devices.</p> Graphical Abstract <p></p>

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Experimental visualization of liquid slug dynamics in a meander-shaped low-fill heat pipe using neutron radiography

  • 期刊论文

  • 发表日期：

    2025年11月29日

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  • Koji Fumoto,
  • Kento Okubo,
  • Shotaro Oshima,
  • Asami Hatamoto,
  • Keisuke Kurita,
  • Isao Harayama,
  • Hiroshi Iikura

摘要

Understanding heat transport in miniaturized thermal management devices is critical for high-power electronic systems. This study presents a novel visualization of internal two-phase flow within a meander-shaped low-fill heat pipe (MLFHP) using neutron radiography. The MLFHP, fabricated from aluminum with a serpentine microchannel structure and filled with only 10 vol.% water, demonstrates remarkable heat transport performance despite the ultra-low filling ratio. We conducted non-invasive neutron imaging experiments at the JRR-3 reactor facility to investigate fluid motion and phase change behavior under various heat input conditions. The results reveal that liquid slugs travel unidirectionally from the heating to cooling sections without oscillatory behavior or reflux, unlike conventional pulsating heat pipes. Notably, effective heat transfer is achieved through latent heat without dry-out, even at high thermal loads. Unlike conventional pulsating heat pipes (PHPs), the MLFHP exhibits a novel, non-oscillatory two-phase transport mechanism. The findings provide new insight into the heat transfer mechanism of non-oscillating two-phase systems and highlight the effectiveness of neutron radiography in visualizing internal dynamics in opaque thermal devices.

Graphical Abstract