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Visualization Study of Startup Modes and Operating States of a Flat Two-Phase Micro Thermosyphon

Author

Listed:
  • Liangyu Wu

    (School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China)

  • Yingying Chen

    (School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China)

  • Suchen Wu

    (Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China)

  • Mengchen Zhang

    (Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China)

  • Weibo Yang

    (School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China)

  • Fangping Tang

    (School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China)

Abstract

The flat two-phase thermosyphon has been recognized as a promising technique to realize uniform heat dissipation for high-heat-flux electronic devices. In this paper, a visualization experiment is designed and conducted to study the startup modes and operating states in a flat two-phase thermosyphon. The dynamic wall temperatures and gas–liquid interface evolution are observed and analyzed. From the results, the sudden startup and gradual startup modes and three quasi-steady operating states are identified. As the heat load increases, the continuous large-amplitude pulsation, alternate pulsation, and continuous small-amplitude pulsation states are experienced in sequence for the evaporator wall temperature. The alternate pulsation state can be divided into two types of alternate pulsation: lengthy single-large-amplitude-pulsation alternated with short multiple-small-amplitude-pulsation, and short single-large-amplitude-pulsation alternated with lengthy multiple-small-amplitude alternate pulsation state. During the continuous large-amplitude pulsation state, the bubbles were generated intermittently and the wall temperature fluctuated cyclically with a continuous large amplitude. In the alternate pulsation state, the duration of boiling became longer compared to the continuous large-amplitude pulsation state, and the wall temperature of the evaporator section exhibited small fluctuations. In addition, there was no large-amplitude wall temperature pulsation in the continuous small-amplitude pulsation state, and the boiling occurred continuously. The thermal performance of the alternate pulsation state in a flat two-phase thermosyphon is inferior to the continuous small-amplitude pulsation state but superior to the continuous large-amplitude pulsation state.

Suggested Citation

  • Liangyu Wu & Yingying Chen & Suchen Wu & Mengchen Zhang & Weibo Yang & Fangping Tang, 2018. "Visualization Study of Startup Modes and Operating States of a Flat Two-Phase Micro Thermosyphon," Energies, MDPI, vol. 11(9), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2291-:d:166737
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    References listed on IDEAS

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    2. Sharma, Chander Shekhar & Tiwari, Manish K. & Zimmermann, Severin & Brunschwiler, Thomas & Schlottig, Gerd & Michel, Bruno & Poulikakos, Dimos, 2015. "Energy efficient hotspot-targeted embedded liquid cooling of electronics," Applied Energy, Elsevier, vol. 138(C), pages 414-422.
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