Figure 8.

During propagation of the fingers of air, high velocities likely result in significant shear stress in the surrounding liquid. (A) The air-water interface at 0 ms (an arbitrary reference time) is shown in white. (B) After 8 ms, the interface has propagated 750 μm through a neck of 75-μm diameter, shown between the two arrows. (C) The propagating front of air is modeled as a long bubble in a tube with two regions of interest, i and ii, in which shear stresses are estimated. Scale bars, 500 μm.