Lubrication theory  is an assertion put across to explain the film in between the movement of the bubble and the wall of the cell. Much heat is transmitted when the bubbles are moving and this affects the thickness of the film especially when bubble is moving on a sloping surface Pushkarova and Horn . Peng et al.  developed a measure experimentally to determine the surface push between the wall and the bubbles being formed. The result of this is a numerical representation of the predictions for the physical appearance and mass of the bubbles beneath the parallel platform. Perron et al  explained that the bubbles are formed in round shapes but due to the force of gravity, they flatten with time. There are two phases in which the bubbles go through, the first one being the enlargement phase and the second one being the separation phase . This is however not the case in platforms that are facing downwards since here the force of gravity aides bubble growth and instead of separating, the bubbles either spread on the plane or inclination depending on what was used. When developing the circular shape, the bubbles remain attached to the plunger while at the same time maintaining contact with the surrounding of the opening. Here, the famous Laplace equation is used to determine the physical appearance of the interface at the point of stability. When applied in real-life processes such as the Hall-Heroult cell, in which case the distance between the positively and negatively charged electrodes is small, the size of the bubbles and their developing characteristics affect the flowing feature of the liquid metal.
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