Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
1 PublicationThermocapillary bubble migration -Drop tower experiments-
Galindo, V.; Gerbeth, G.; Treuner, M.; Langbein, D.; Rath, H. J.
Abstract
Experiments on the thermocapillary bubble migration are presently carried out in the Drop Tower Bremen. After a heating period of about two hours, a sufficiently linear temperature gradient is established with paraffin liquids in a cavity. For the moment of drop of the capsule two bubbles with diameters of up to 2 mm are generated and the injection needles are retracted. During 4.74 s under strongly reduced gravity the speed of the bubble migration is observed with video camera, the temperature field by Pt 100 temperature gauges and the use of a differential interferometer. First experimental results with a liquid characterized by the Prandtl number Pr = 10 (n-decane) agree very well with theoretical data available both from literature as well as with numerical simulations. The correspoding Reynolds numbers are in the range between 20 < Re < 160. The experimental setup, the measuring technique and the evaluation method will be presented as well as comparison between experimental and theoretical results.
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Lecture (Conference)
"Drop Tower Days 94", Bremen, Juli 1994
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