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PIV measurements and Eulerian-Lagrangian simulations of the unsteady gas-liquid flow in a needle sparger rectangular bubble column

Besbes, S ; El Hajem, Mahmoud ; Ben Aissia, H ; Champagne, Jean-Yves ; Jay, J Lmfa, Publications (Editor)

Chemical Engineering Science, 2015, Vol.126, pp.560-572 [Periódico revisado por pares]

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  • Título:
    PIV measurements and Eulerian-Lagrangian simulations of the unsteady gas-liquid flow in a needle sparger rectangular bubble column
  • Autor: Besbes, S ; El Hajem, Mahmoud ; Ben Aissia, H ; Champagne, Jean-Yves ; Jay, J
  • Lmfa, Publications (Editor)
  • Assuntos: Engineering Sciences ; Mechanics ; Fluids Mechanics ; Engineering
  • É parte de: Chemical Engineering Science, 2015, Vol.126, pp.560-572
  • Descrição: To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.ces.2014.12.046 Byline: S. Besbes [sobesbes@laposte.net] (a,*), M. El Hajem (b), H. Ben Aissia (a), J.Y. Champagne (b), J. Jay (c) Keywords Bubble column; Hydrodynamics; Particle image velocimetry; PIV; CFD Highlights * Experiments with particle image velocimetry and Euler--Lagrange simulations in a needle sparger rectangular bubble column. * Effects of gas flow rates on the dynamic and time-averaged flow properties were studied. * The simulated vertical liquid velocity was found to be satisfactory to the PIV measurements for low flow rates. * The stronger bubble plume velocity oscillations were located near the entrance zone. Abstract In this work, we conducted a detailed experimental as well as a computational study for the hydrodynamic characterization of the flow in a needle sparger rectangular bubble column. Particle image velocimetry technique (PIV) was used to simultaneously capture the images of both bubbles and seeding polyamide tracers of 50 [mu]m in diameter, the tracer particles were selected to provide sufficient contrast and were neutrally buoyant. A three-dimensional computational model based on an Euler--Lagrange (E--L) approach was performed to simulate the dynamic characteristics of the oscillating bubble plume. The continuous phase velocity field was obtained by solving the unsteady Reynolds averaged Navier--Stokes equations along with the k--[epsilon] turbulence model. Bubble tracking was achieved by solving the Newton equations of motion taking into account drag force, pressure, buoyancy and gravity. Two-way coupling between the liquid and gas phases are accounted for in the continuous phase momentum equation. The effect of gas flow rate on the dynamic and time-averaged flow properties were studied, the flow was found to have an unsteady structure with three vortices moving in the upward direction and the bubble plume between them oscillated. The simulated results were found to be in accordance with the PIV measurements for a gas flow rate up to 0.1 l/min. The simulated turbulent kinetic energy indicates that the stronger bubble plume velocity oscillations are located near the entrance zone and are caused by the addition of a shear induced turbulence produced by the presence of an oscillating bubble plume. Author Affiliation: (a) Metrology Research Unit and Energy Systems (URMSE), National School of Engineers of Monastir, Road Ouerdanine, 5000 Monastir, Tunisia (b) Laboratory of Fluid Mechanics and Acoustics (LMFA), Lyon, France (c) Thermal Center of Lyon (CETHIL), INSA Lyon, 20 Av. A. Einstein, 69621 Villeurbanne Cedex, France * Correspondence to: Metrology Research Unit and Energy Systems, Department Energetic of National School of Engineers of Monastir, Road Ouerdanine, 5000 Monastir, Tunisia. Tel.: +216 73500826/97664041. Article History: Received 16 June 2014; Revised 24 October 2014; Accepted 17 December 2014
  • Idioma: Inglês

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