Drainage of a thin film of Bingham fluid between two viscous Newtonian drops

Abstract eng:
The drainage of a film of Bingham fluid between two colliding Newtonian drops differs from that of a Newtonian film in three m ways. First, drainage rates are slower for yield stress films as compared to Newtonian films of the same viscosity. Second, the spherical regime of drainage is characterized by higher curvatures in the film region, and it transitions to the dimpled regime at times later than the Newtonian case. Third, the Bingham film can freeze completely at a critical thickness, hf, which counterintuitively, is independent of the force pushing the drops against each other. The results suggest that for a given shear rate, coalescence will occur at a slower rate, and will be completely hindered above a critical drop size.

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