An experimental study of a flat plate pulsating heat pipe has been performed under various gravity conditions during ESA 69th parabolic flight campaign. A molybdenum plate, with 14 milled rectangular channels with cross-section of 3×3 mm2, was covered with a sapphire window, and tested in vertical position with ethanol as working fluid. If operation in normal and hyper-gravity conditions were characterized by nucleate boiling regime, FP-PHP working like in looped thermosyphon mode, transition into microgravity was accompanied by a flow pattern change into slug/plug regime with thin film evaporation, due to absence of buoyancy forces. Hydrodynamic instabilities, accompanied with short-term periods of emergence of nucleate boiling under microgravity, were observed during several parabolas. Formations of long vapor slugs in the channel lead to thin film evaporation. Combined optical and infrared visualizations showed velocity and amplitude increase of the menisci motions.
|Publication status||Published - Sep 2019|
|Event||International Symposium on Oscillating/Pulsating Heat Pipes - Daejeon, Korea, Republic of|
Duration: 25 Sep 2019 → 28 Sep 2019
|Conference||International Symposium on Oscillating/Pulsating Heat Pipes|
|Abbreviated title||ISOPHP 2019|
|Country/Territory||Korea, Republic of|
|Period||25/09/19 → 28/09/19|
- Flat plate pulsating heat pipe
- Infrared thermography
- Parabolic flight
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- School of Arch, Tech and Eng - Principal Lecturer
- Advanced Engineering Centre