Flight results on Marangoni flow instability in liquid bridges

R. Savino, R. Monti, M. Lappa, L. Carotenuto, D. Castagnolo, R. Fortezza

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Abstract

This paper reports on the results of the experiment PULSAR (Pulsating and Rotating Instabilities in Oscillatory Marangoni Flows), performed on the MAXUS 3 Sounding Rocket launched last November from the Swedish base in Kiruna. Aim of the experiment was the study of the oscillatory Marangoni convection in a cylindrical liquid bridge of silicone oil with kinematic viscosity of 5cSt. The experiment was motivated by preliminary on-ground numerical simulations and microscale experimental studies, that have pointed out that the oscillatory Marangoni instability appears at the beginning in the form of a pulsating regime, caused by a hydro-thermal standing wave, and then it turns to a rotating regime, caused by a traveling wave. The height of the bridge was equal to the disk diameter (20mm), and the imposed temperature difference was 15K during the first 460 s and 20K in the second part of the experiment, until the end of the microgravity period.
The analysis of the temperature profiles, measured by thermocouples located near the disks at the same radial and axial coordinate but at different azimuthal coordinates (shifted at 90°), and the surface temperature distribution, measured by an infrared thermocamera, show that a pulsating and a mixed pulsating-rotating regimes have been established during the experiment.
Unfortunately during the flight the accelerations level caused by two centrifuges with some biological samples in an adjacent
Original languageEnglish
Title of host publication50th Congress of the International Astronautical Federation, Amsterdam, The Netherlands, 4-8 October 1999
Number of pages10
Publication statusPublished - 8 Oct 1999
Event50th Congress of the International Astronautical Federation, 1999 - Amsterdam, Netherlands
Duration: 4 Oct 19998 Oct 1999

Other

Other50th Congress of the International Astronautical Federation, 1999
CountryNetherlands
CityAmsterdam
Period4/10/998/10/99

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Keywords

  • Marangoni flow
  • liquid bridge
  • PULSAR
  • MAXUS 3
  • ounding Rocket
  • numerical simulations
  • microgravity

Cite this

Savino, R., Monti, R., Lappa, M., Carotenuto, L., Castagnolo, D., & Fortezza, R. (1999). Flight results on Marangoni flow instability in liquid bridges. In 50th Congress of the International Astronautical Federation, Amsterdam, The Netherlands, 4-8 October 1999 [IAF-99-J.3.01]