Experimental Investigation of Capillary-Driven Two-Phase Flow in Water/Butanol under Reduced Gravity Conditions
- 21 Downloads
The capillary flow of water/butanol mixture is investigated in a single groove heat pipe model on board the Airbus A310 ‘Zero-G’ of the European Space Agency. As working fluid for evaporation-based heat transfer devices like conventional or pulsating heat pipes, these kinds of mixtures give more stable behaviour and higher dry-out limit with respect to pure water because of an anomalous behaviour of the surface tension with temperature. The groove is embedded in a semi-transparent test cell that allows for the qualitative visualization of the liquid distribution along the channel and is heated and cooled at two opposite sides with an electrical resistance and a water circulation system. The evaporation/condensation process is regulated changing the power input in a range between 5 and 30 W and the liquid distribution is detected from a top window using a CCD camera and a LED illumination device. The results show that the liquid distribution is affected by the gravity level and this effect is normally masked on ground.
KeywordsHeat pipe Capillary flow Self-rewetting fluids Parabolic flight
The authors acknowledge the financial support of the European Space Agency through the MAP (Microgravity Application Promotion) project: “Innovative Wickless Heat Pipe Systems for Ground and Space Applications (INWIP)”. ESTEC Contract number: 4000115115/15/NL/PG. Special thanks must be given to NOVESPACE team in Bordeaux for their assistance and to Dr. B. Toth (ESA).
- Abe, Y.: About self-rewetting fluids - possibility as a new working fluid. Therm. Sci. Eng. 12(3), 9–18 (2004)Google Scholar
- Cecere, A., Di Paola, R., Savino, R., Abe, Y., Carotenuto, L., Van Vaerenbergh, S.: Observation of Marangoni flow in ordinary and self-rewetting fluids using optical diagnostic systems. Eur. Phys. J. Spec. Top. 192, 109–120 (2011)Google Scholar
- Nishiguchi, S., Shoji, M.: Critical heat flux of butanol aqueous solution. Therm. Sci. Eng. 20(1), 1–5 (2012)Google Scholar
- Savino, R., Monti, R.: Heat pipes for space applications. Space Technology. 25(1), (2005)Google Scholar
- Savino, R., Di Paola, R., Cecere, A. and Fortezza, R., Self-rewetting heat transfer fluids and nano-brines for space heat pipes. Acta Astronaut., vol. 67, 9/10, 1030–1037, (2011)Google Scholar
- Savino, R., Cecere, A., Van Vaerenbergh, S., Abe, Y., Pizzirusso, G., Tsevecos, W., Mojahed, M., Galand, Q.: Some experimental progresses in the study of self-rewetting fluids for the SELENE experiment to be carried in the thermal platform 1 hardware. Acta Astronaut. 89, 179–188 (2013)CrossRefGoogle Scholar