Cavitation bubble dynamics and sonochemiluminescence activity inside sonicated submerged flow tubes
| Autor: | Julian Eisener, Juan Manuel Rosselló, Dwayne Savio Stephens, Busra Ekim Sarac, Robert Mettin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Chemical Engineering Bubble Flow (psychology) Nucleation Energy Engineering and Power Technology FOS: Physical sciences 02 engineering and technology Applied Physics (physics.app-ph) 010402 general chemistry 01 natural sciences Industrial and Manufacturing Engineering Physics::Fluid Dynamics Physics - Chemical Physics Tube (fluid conveyance) Chemical Physics (physics.chem-ph) Process Chemistry and Technology Fluid Dynamics (physics.flu-dyn) General Chemistry Mechanics Physics - Applied Physics Physics - Fluid Dynamics 021001 nanoscience & nanotechnology Slug flow 3. Good health 0104 chemical sciences cavitation sonochemistry bubble dynamics Cavitation Ultrasonic sensor 0210 nano-technology Displacement (fluid) |
| Zdroj: | Chemical Engineering and Processing-Process Intensification |
| Popis: | Bubble dynamics and luminol emissions of cavitation in sub-millimeter-sized PFA flow tubes, submerged in an ultrasonic bath reactor, are studied at 27 kHz driving frequency. Nucleation of cavitation inside the tubes only takes place via a free interface, realized here in form of an alternating water-air slug flow. High-speed recordings show that cavitation bubbles in the water slugs often develop localized structures in form of clusters or bubble plugs, and that such structures can be seeded via a single pinch-off from the free interface. Within the structures, bubbles strongly interact and frequently undergo merging or splitting events. Due to the mutual interaction and resulting motion, bubbles often collapse with a fast displacement, suggesting jetting dynamics. Bubble compression ratios are estimated on basis of observed individual bubble dynamics and numerical fitting by a single bubble model. The resulting peak temperatures around 3000 K allow for dissociation of water vapor. This is in accordance with observed sonochemiluminescence from luminol, originating from active bubble zones in the tubes. Comment: 23 pages, 7 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|