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International Journal of Fluid Mechanics Research

Publication de 6  numéros par an

ISSN Imprimer: 2152-5102

ISSN En ligne: 2152-5110

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.1 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.0002 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.33 SJR: 0.256 SNIP: 0.49 CiteScore™:: 2.4 H-Index: 23

Indexed in

Hydrodynamics Interaction between Air Bubbles and Particles in Flotation Revealed by High-Speed Visualization

Volume 41, Numéro 6, 2014, pp. 499-511
DOI: 10.1615/InterJFluidMechRes.v41.i6.30
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RÉSUMÉ

A mineral separation process usually involves a flotation method which uses buoyancy forces on microbubbles. The important factors which determine the separation efficiency heavily relate to the intensity of occurrence of bubble-particle collision. This occurrence is mainly controlled by the hydrodynamics interaction between the bubbles and mineral particles so that improved understandings on the underlying physics become the key point in improving the performance of separation process. In the present research the interaction between bubble and particles without interfacial modification is studied experimentally focusing on the mode of interaction, probability of collision and the angle of detachment. The test was done by using the experimental set up which consisted of a fluid container made of glass, syringe pump as bubble generator, particle feeder, illumination system, high speed video camera and image processing software. The bubble generator and particle feeder were carefully designed so that the bubble formation, as well as the particle feeding could be precisely controlled and water was used as the medium. The microhydrodynamics aspects which were observed and analyzed included the collision, attachment, detachment and particles movements. The results show that two modes subprocesses after the bubble-particles collisions characterized the microhydrodynamics interactions between particle and bubble namely reflection and attachment with the former dominates the mechanism with higher probability of occurrence. Moreover, larger particles are influenced by the microhydrodynamics forces when they are below the bubbles which are floating upward. The collision efficiency is then influenced by the particles velocity toward the bubble within a very small distance. Here, the particles movement is affected by a fore- and aft-asymmetric motion of the fluid surrounding the bubbles. Further, the particles movement depends on the mobility of bubble surface and particles inertia.

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