Self-similarity has been the paradigmatical picture for the pinch-off of a drop. Here we will show through high-speed imaging and Boundary Integral simulations that the inverse problem, the pinch-off of an air bubble in water, is not self- similar: A disk is quickly pulled through a surface leading to a giant, cylindrical cavity which after collapse creates an upward and a downward jet. The minimal void radius scales only in the limiting case of large Froude number like R(t) ∼ t½, as expected for the purely inertial regime. The collapse slows down however for lower values of Froude due to a flow component in the vertical direction introducing a second time-dependent length-scale, the curvature of the void.
|Publication status||Published - 20 Nov 2005|
|Event||58th Annual Meeting of the APS Division of Fluid Dynamics, APS-DFD 2005 - Chicago, United States|
Duration: 20 Nov 2005 → 22 Nov 2005
Conference number: 58
|Conference||58th Annual Meeting of the APS Division of Fluid Dynamics, APS-DFD 2005|
|Period||20/11/05 → 22/11/05|