Tracking single bubble in Hall-Héroult aluminium cell : an experimental and numerical study
Das, Subrat, Littlefair, Guy, Morsi, Yos and Brooks, Geoffrey 2012, Tracking single bubble in Hall-Héroult aluminium cell : an experimental and numerical study, in ISTEC 2012 : Proceedings of the 3rd International Science & Technology Conference, ISTEC, [Dubai, UAE], pp. 1290-1298.
In simulations of the hydrodynamics of the multiphase flow in gas– liquid systems with finite sizes of bubbles, the important thing is to compute explicitly the time evolution of the gas–liquid interface in many engineering applications. The most commonly used methods representing this approach are: the volume of fluid and the phase field methods. The later has gained significant interest because of its capability of performing numerical computations on a fixed Cartesian grid without having to parametrise these objects (Eulerian approach) and at the same time it allows to follow the interface ( for example bubble’s shape) that change the topology. In this paper, both numerical (phase field method) and experimental results for the bubble shapes underneath a downward facing plane is presented. Experiments are carried out to see the bubble sliding motion underneath a horizontal and inclined anode. It is assumed that the bubble formed under the anode surface is deformed (flattened) due to buoyant field before it goes around the anode corner. The bubble elongates to form a tail-like shape. The change in shape of the bubble is almost instantaneous and has a significant effect on the localised hydrodynamics around the bubble, which could influence the dynamics of the flow patterns in the Hall–Héroult cell. This deformation is the main cause of the bubble wake and the induced flow field in the aluminium cell. Various parameters such as bubble size, deformation and its sliding mechanism at different surface tensions are discussed and compared with experimental results.
Language
eng
Field of Research
091307 Numerical Modelling and Mechanical Characterisation
Socio Economic Objective
840301 Alumina Production
HERDC Research category
E2 Full written paper - non-refereed / Abstract reviewed
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