Abstract
The thermocapillary migration of single bubbles at high Reynolds and Marangoni numbers has been investigated. Experiments on the transient behavior of moving bubbles with Marangoni numbers up to Mg = 2500 were carried out in the Bremen drop tower. After a long heating period, a sufficiently linear temperature gradient was established with paraffin liquids. For 4.74 s of strongly reduced gravity the speed of the bubble migration was observed with a video camera. The temperature field was recorded by Pt100 temperature gauges and by differential interferometry. Numerical calculations of the steady-state flow were performed and were found to be in good correspondence with the experimental data. The calculations for large Marangoni numbers show a slight but important correction of previous results. The specific advantages of using a drop tower for such experiments result in multiple experimental data on transient and quasisteady thermocapillary bubble migration, showing much better statistical reliability than previous microgravity experiments.
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