Hydrothermal waves in a liquid bridge with aspect ratio near the Rayleigh limit under microgravity

A 2 cSt silicone oil ( Pr = 28 ) liquid bridge of 15.0 mm length L and 3.0 mm radius r (aspect ratio A = L ∕ r = 5 ) was established under microgravity during the flight of the sounding rocket MAXUS-4. Four different temperature differences Δ T = 7 , 9 , 10 , and 12 K were applied between the ends,...

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Bibliographic Details
Published in:Physics of fluids (1994) 2005-11, Vol.17 (11), p.112104-112104-8
Main Author: Schwabe, D.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Hydrodynamic stability
Physics
Surface-tension-driven instability
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Summary:A 2 cSt silicone oil ( Pr = 28 ) liquid bridge of 15.0 mm length L and 3.0 mm radius r (aspect ratio A = L ∕ r = 5 ) was established under microgravity during the flight of the sounding rocket MAXUS-4. Four different temperature differences Δ T = 7 , 9 , 10 , and 12 K were applied between the ends, each for sufficient time to reach steady-state thermocapillary flow conditions. The aim of the experiment—to observe the onset of hydrothermal waves and to measure their features such as the wave phase speed and the angle between the wave vector and the applied temperature gradient—was reached. We used microgravity in this experiment in a twofold manner: (1) a liquid bridge with A = 5 can be established only under microgravity; (2) it was possible to study hydrothermal waves without the influence of gravity and without the aspect ratio restrictions at normal gravity.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.2135805