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Detachment of a drop from an internal wall in a pulsed liquid-liquid column

Mate, A ; Masbernat, O ; Gourdon, C

Chemical engineering science, 2000-06, Vol.55 (11), p.2073-2088 [Periódico revisado por pares]

Oxford: Elsevier Ltd

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  • Título:
    Detachment of a drop from an internal wall in a pulsed liquid-liquid column
  • Autor: Mate, A ; Masbernat, O ; Gourdon, C
  • Assuntos: Adhesion force ; Applied sciences ; Chemical engineering ; Drop ; Exact sciences and technology ; Hydrodynamic force ; Liquid-liquid extraction ; Liquid–liquid dispersion ; Wettability
  • É parte de: Chemical engineering science, 2000-06, Vol.55 (11), p.2073-2088
  • Descrição: In this paper, we present an experimental and numerical study of the critical detachment force of a drop wetting a disc of a liquid–liquid extraction pulsed column. The critical pulsation frequency necessary to dislodge the drop from the wall has been determined with different drop diameters, two different liquid phase systems (one at low and one at high interfacial tension). The corresponding hydrodynamic critical force exerted on the drop has been estimated by means of numerical simulation, using a CFD computational code to describe the pulsed flow in the column. Due to the flow nonuniformity, for a given pulsation frequency, the hydrodynamic force is a function of the drop location upon the disc. Results have been compared to the retentive adhesion force of the drops sticking on the disc which has been estimated on the base of measurements performed in a previous work (Masbernat, Pétrissans and Gourdon (1997). Récents progrès en Génie des Procédés 11(55), 51–56) using the inclined plate method. It is shown that when the drop is dislodged, the calculated hydrodynamic force is equal to the adhesion force and corresponds to the maximum of the pulsation radial velocity (parallel to the disc) calculated at the location of the drop mass centre. These results show that it is possible to correctly estimate the detachment of drops on walls even in complex flows, provided the drop-wall contact angle hysteresis is known (and uniform) in the column. It is also shown that the critical detachment force is a necessary condition for the drop to be removed from the plate but not sufficient.
  • Editor: Oxford: Elsevier Ltd
  • Idioma: Inglês
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