Drainage Drop shape

Under the action of an outer driving force, the flnid particles approach each other. The hydro-dynamic interaction is stronger at the front zones and leads to a weak deformation of the interfaces in this front region. In this case, the nsnal hydrodynamic capillary number, Ca = V[VJa, which is a small parameter for nondeformable surfaces, should be modified to read Ca = y VJiJch, where the distance, h, between the interfaces is taken into account. The shape of the gap between two drops for different characteristic times was calcnlated numerically by many authors. " Experimental investigation of these effects for symmetric and asynunetric drainage of foam films were carried out by Joye et In some special cases, the deformation of the fluid particle can be... 

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