Dynamics of evaporation in a single, straight-tube pulsating heat pipe

Kunito Okuyama, Takahiro Ichikawa, Shoji Mori

研究成果: 会議への寄与タイプ論文

抄録

The dynamics of vapor flow in a pulsating heat pipe consisting of a single, straight tube (SST-PHP) is investigated using a hot-wire anemometric technique. The proposed SST-PHP generates stable and periodic oscillation of a single vapor plug with a large stroke that transports the heat of 75 W with an effective thermal conductivity of 40 kW/(m·K) at horizontal orientation. Vapor produced in the heating section flows into the heat transport tube and condenses on a liquid film formed between the vapor plug and the tube wall to transport heat from the heating section to the heat transport tube. The measured flow rate of vapor varies drastically during one oscillation cycle, i.e., increases to approximately ten times the molar rate of increase of vapor in the vapor plug during the growth period while remaining relatively low during shrinkage. The evaporation rate in the heating section, which is evaluated from the vapor flow rate, significantly exceeds the vapor generation rate that corresponds to the heat transport rate during the growth of the vapor plug. The condensation rate varies similarly so as to catch up with the evaporation rate with a small phase delay in accordance with the oscillation motion of the vapor plug. The storage and release of the sensible heat at the liquid film resulting from the variation in the saturation temperature due to the pressure oscillation are suggested to play a significant role in the dynamics of vapor generation and the large-amplitude oscillation.

元の言語英語
出版物ステータス出版済み - 1 1 2014
イベント15th International Heat Transfer Conference, IHTC 2014 - Kyoto, 日本
継続期間: 8 10 20148 15 2014

その他

その他15th International Heat Transfer Conference, IHTC 2014
日本
Kyoto
期間8/10/148/15/14

Fingerprint

heat pipes
Heat pipes
Evaporation
Vapors
evaporation
vapors
tubes
plugs
heat
oscillations
evaporation rate
Liquid films
Heating
heating
flow velocity
horizontal orientation
Flow rate
stable oscillations
pressure oscillations
liquids

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Condensed Matter Physics

これを引用

Okuyama, K., Ichikawa, T., & Mori, S. (2014). Dynamics of evaporation in a single, straight-tube pulsating heat pipe. 論文発表場所 15th International Heat Transfer Conference, IHTC 2014, Kyoto, 日本.

Dynamics of evaporation in a single, straight-tube pulsating heat pipe. / Okuyama, Kunito; Ichikawa, Takahiro; Mori, Shoji.

2014. 論文発表場所 15th International Heat Transfer Conference, IHTC 2014, Kyoto, 日本.

研究成果: 会議への寄与タイプ論文

Okuyama, K, Ichikawa, T & Mori, S 2014, 'Dynamics of evaporation in a single, straight-tube pulsating heat pipe' 論文発表場所 15th International Heat Transfer Conference, IHTC 2014, Kyoto, 日本, 8/10/14 - 8/15/14, .
Okuyama K, Ichikawa T, Mori S. Dynamics of evaporation in a single, straight-tube pulsating heat pipe. 2014. 論文発表場所 15th International Heat Transfer Conference, IHTC 2014, Kyoto, 日本.
Okuyama, Kunito ; Ichikawa, Takahiro ; Mori, Shoji. / Dynamics of evaporation in a single, straight-tube pulsating heat pipe. 論文発表場所 15th International Heat Transfer Conference, IHTC 2014, Kyoto, 日本.
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