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• W1479884758 abstract "The behavior of a cavitation bubble is greatly influenced by its surroundings.In an unbounded liquid a cavitation bubble grows and collapsesspherically but a nearby solid boundary changes everything. Now thebubble collapses towards the wall and looses its spherical shape. Duringcollapse a thin jet is formed piercing through the center of the bubbleaimed towards the wall. Upon impacting on the boundary the jet spreadsout radially exerting a strong shear stress on the wall. The shear strengthdrops with a -11=4 power law.The strength of the jet depends strongly on the starting distance betweenthe bubble and the wall. The jet impact velocity increases the closerthe bubble gets to the wall up to a maximum for a standoff distance ofabout » 0.6. For bubbles closer than that the jet velocity decreases.This jet flow can be utilized to temporarily porate the membranes ofliving cells; adherent cells are grown on the wall of a culture flask and exposedto a single cavitation bubble. As the jet impacts on the cell monolayerit detaches cells in a circular region around the point of impact. Surroundingthe cleared area there is a ring where the shear stress was toweak to detach the cells but strong enough to rip small holes in the cellmembrane.This permeabilization of the membrane can be detected by adding adye to the liquid such that only the porated cells will be stained. Afterwardsthe cells are tracked for an entire day to make sure they survive thetreatment.Interestingly enough when a bubble is created with a standoff distancesmaller than ° = 0.6 the amount of stained cells keeps increasing whilethe circular detachment area shrinks. The cause for this is the bubblegrowth on top off the surface which is also strong enough to porate cells.This finding can be used for instance in microfluidics. If a bubble iscreated in a thin liquid film between two parallel plates the bubble takeson a flat pancake like shape. This quasi 2-dimensional bubble grows andcollapses in a circular fashion and no jets are formed. But as was shown before bubble growth across a surface can also porate cells and by growingcells on one of the two walls in such a system this was also proven the casein microfluidics.Cells in suspension can also be porated but during bubble growth theytake on a ”tear” shape which is expected to be a result of entraining thecell from the boundary layer into the main flow. A way to circumvent thisinstability we created a second bubble on the other side of the cell. Thecell becomes compressed and simultaneously sheared yet it remains inplace.Bubbles in confined geometries jet in the presence of a channel wall;even when a small channel opening is present. By positioning the bubblesuch that the jet does not impact on the wall but flows into the a channelopening realizes a pump. This idea which was put forward for larger millimetersized bubbles by Khoo’s group (Khoo, et.al. 2005) has now beenfor the first time realized on the microscale for lab on a chip devices.Similar to the step from 3D to 2D the addition of second side wallclose the first side wall takes us from 2D to a quasi 1-dimensional bubble.A bubble generated in such a long and thin channel only grows andcollapses in the lengthwise direction of the channel. A one dimensionalmodel does indeed describe the bubble dynamics quite accurately butonly if the temperature inside the bubble is taken into account.This time another solid boundary will not induce jetting in the bubble.A free interface close to the jet however does result in a jet. It is howevernot a jet penetrating through the bubble but the result of the rapidly growingbubble pushing liquid out of the open end of the channel. We demonstrateon demand and reproducible jetting on the micrometer scale withmore than 100 m/s." @default.
• W1479884758 created "2016-06-24" @default.
• W1479884758 creator A5055991502 @default.
• W1479884758 date "2009-03-16" @default.
• W1479884758 modified "2023-09-30" @default.
• W1479884758 title "Confined cavitation : an experimental study" @default.
• W1479884758 doi "https://doi.org/10.3990/1.9789036528221" @default.
• W1479884758 hasPublicationYear "2009" @default.
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