Abstract
An inertial bubble collapsing near a solid boundary generates a fast impulsive microjet directed toward the boundary. The jet impacts the solid boundary at a high velocity, and this effect has been taken advantage of in industrial cleaning such as when tiny bubbles are driven ultrasonically to cavitate around machined parts to produce jets that are believed to induce the cleaning effect. In this experimental investigation, we are interested in the jetting from single cavities near a boundary. By introducing a through hole in the boundary beneath a laser-induced bubble, it is hypothesized that the forming jet, upon bubble implosion, will proceed to penetrate through the hole to the other side and that it may be utilized in useful applications such as precise surgeries. It was found that the growth of the bubble induced a fast flow through the hole and lead to the formation of secondary hydrodynamic cavitation. The experiments also showed the formation of a counter jet directed away from the hole and into the bubble. During the growth phase of the bubble, and near the point of maximum expansion, the bubble wall bulged out toward the hole in a ‘bulb’ like formation, which sometimes resulted in the pinching-off of a secondary small bubble. This was ensued by the inward recoiling of the primary bubble wall near the pinch-off spot, which developed into a counter jet seen to move away from the hole and inward into the bubble.
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Abbreviations
- \( t_{c} \) :
-
Bubble collapse time from inception to the point of minimum volume at first collapse
- \( R_{\hbox{max} } \) :
-
Bubble maximum radius
- \( \tau_{R} \) :
-
Rayleigh collapse time for a vaporous bubble
- \( \Updelta P = P_{\infty } - P_{v} \) :
-
Pressure difference between the liquid far away and the bubble interior (the interior pressure is given by the vapor pressure of water at the liquid temperature)
- \( \rho \) :
-
Liquid density
- L :
-
Distance from the boundary to the bubble center
- \( \gamma \) :
-
Non-dimensional distance from the center of the bubble to the boundary (normalized by the maximum bubble radius)
- k :
-
Collapse time prolongation factor for a non-spherical bubble; equal to the collapse time of the non-spherical deformed bubble normalized by the collapse time of a spherical bubble of equivalent radius. \( k = \frac{{t_{{c,\,{\text{deformed}}}} }}{{t_{{c,\,{\text{spherical}}}} }} \)
- \( R_{\text{hole}} \) :
-
Radius of the through hole drilled in the solid boundary
- \( \alpha \) :
-
Non-dimensional through hole radius (normalized by the bubble maximum radius) \( \alpha = \frac{{R_{\text{hole}} }}{{R_{\hbox{max} } }} \)
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Acknowledgments
Funding for this work was provided by the Arab Science and Technology Foundation (ASTF), project grant # HE06160. The major equipment was acquired with generous funding from the United States Agency for International Development/Office of American Schools and Hospitals Abroad (USAID/ASHA).
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Abboud, J.E., Oweis, G.F. The microjetting behavior from single laser-induced bubbles generated above a solid boundary with a through hole. Exp Fluids 54, 1438 (2013). https://doi.org/10.1007/s00348-012-1438-6
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DOI: https://doi.org/10.1007/s00348-012-1438-6