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Full-Text Articles in Mechanical Engineering
Instability Of Electrokinetic Microchannel Flows With Conductivity Gradients, Hao Lin, Brian D. Storey, Michael H. Oddy, Chuan-Hua Chen, Juan G. Santiago
Instability Of Electrokinetic Microchannel Flows With Conductivity Gradients, Hao Lin, Brian D. Storey, Michael H. Oddy, Chuan-Hua Chen, Juan G. Santiago
Brian Storey
Electrokinetic flow is leveraged in a variety of applications, and is a key enabler of on-chip electrophoresis systems. An important sub-class of electrokinetic devices aim to pump and control electrolyte working liquids with spatial gradients in conductivity. These high-gradient flows can become unstable under the application of a sufficiently strong electric field. In this work the instability physics is explored using theoretical and numerical analyses, as well as experimental observations. The flow in a long, rectangular-cross-section channel is considered. A conductivity gradient is assumed to be orthogonal to the main flow direction, and an electric field is applied in the …
Radial Response Of Individual Bubbles Subjected To Shock Wave Lithotripsy Pulses In Vitro, Thomas J. Matula, Paul R. Hilmo, Brian D. Storey, Andrew J. Szeri
Radial Response Of Individual Bubbles Subjected To Shock Wave Lithotripsy Pulses In Vitro, Thomas J. Matula, Paul R. Hilmo, Brian D. Storey, Andrew J. Szeri
Brian Storey
Direct measurements of individual bubble oscillations in lithotripsy fields have been performed using light-scattering techniques. Studies were performed with bubble clouds in gassy water as well as single levitated bubbles in degassed water. There is direct evidence that the bubble survives the inertial collapse, rebounding several times before breaking up. Bubble dynamics calculations agree well with the observations, provided that vapor trapping (a reduction in condensation during bubble collapse) is included. Furthermore, the afterbounces are dominated by vapor diffusion, not gas diffusion. Vapor trapping is important in limiting the collapse strength of bubbles, and in sonochemical activity. © 2010 American …
Heat And Mass Transfer During The Violent Collapse Of Nonshperical Bubbles, Andrew Szeri, Brian Storey, Antony Pearson, John Blake
Heat And Mass Transfer During The Violent Collapse Of Nonshperical Bubbles, Andrew Szeri, Brian Storey, Antony Pearson, John Blake
Brian Storey
The very high speed of collapse of cavitation bubbles is responsible for a number of phenomena of interest in science and engineering: Luminescence, sonochemistry, cavitation damage, ultrasonic cleaning, etc. Strongly forced bubbles may collapse with such violence that the relatively slow processes of diffusion of the heat of compression and of excess vapor to the bubble wall are obviated. This leads to an approximately adiabatic system with nearly constant mass during the final stages of extreme collapses, accompanied by the evolution of sharp thermal and compositional boundary layers on either side of the interface. It is shown that the boundary …