Thermocapillary bubble migration at high Reynolds and Marangoni numbers under low gravity - Comment

This article proposes that the experimental data associated with Treuner et al. (Treuner, M., Galindo, V., Gerbeth, G., Langbein, D., and Rath, H, J., J. Colloid Interface Sci, 179, 114 (1996)) indicates that a secondary oscillation may exist for bubble motion due to thermocapillary effects in a low gravity environment. This oscillation in the velocity appears to have a frequency of about 4 Hz for a 2.0-mm bubble in octane with a temperature gradient of about 0.56 degrees C/mm. (C) 1997 Academic Press.