Measurement of the recoalescence flux into the rear of a Taylor bubble
| Autor: | Rene Delfos, C. M. Rops, J. P. Kockx, F. T. M. Nieuwstadt |
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| Rok vydání: | 2001 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Entrainment (hydrodynamics) Mechanical Engineering Bubble Multiphase flow Computational Mechanics Thermodynamics Particle-laden flows Flux Mechanics Condensed Matter Physics Slug flow Physics::Fluid Dynamics Mechanics of Materials Vertical direction Stratified flow |
| Zdroj: | Physics of Fluids. 13:1141-1150 |
| ISSN: | 1089-7666 1070-6631 |
| DOI: | 10.1063/1.1360713 |
| Popis: | Most of the theoretical models on vertical slug flow assume the mass balance of a Taylor bubble to depend only on the incoming gas flux at the top of the Taylor bubble and on the outgoing entrainment flux at the bottom. This means that the recoalescence flux, which is defined as the fraction of the entrainment flux that coalesces back into the bubble, is neglected. Only in Fernandes et al. [AIChE J. 29, 981 (1983)] is a model proposed for this recoalescence flux but their model has never been verified by measurements. Therefore, we set out in the present research to measure and quantify the recoalescence flux. Our experiments have been carried out in a recirculating flow facility with a vertical cylindrical test section with inner diameter Di=100 mm. In this test section a Taylor bubble is kept at a fixed vertical position by a constant downward liquid flow ΨL. A continuous stream of small helium bubbles is injected into the wake of the Taylor bubble. The recoalescence flux is then determined by measuring... |
| Databáze: | OpenAIRE |
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