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2. Study of a few simple movements
Simple motions are motions that can be treated as two single-phase motions linked by interface conditions. The configuration is generally non-random.
2.1 Ascent of an isolated bubble in an infinite environment
We place ourselves in the frame of reference where the bubble is stationary (figure 3 ) to write the phase and two-phase momentum conservation theorems (article Two-phase flows. General laws ). The flow is assumed to be non-turbulent. We define :
hydrodynamic resistance
[1] 
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Study of a few simple movements
Study of the main driving configurations
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