Entrainment of a gaseous cusp and
wrapping dynamics of liquid film around the horizontal rotating roller
have been studied in a stratified layer. Finite volume based simulations
have been used for numerical prediction of the interface which has
been tracked using volume of fluid (VOF) algorithm. After establishing
the transient dynamics of the wrapping at receding front and entrainment
at the advancing front, we showed the effect of liquid properties
on interfacial dynamics. Mutual interplay between centrifugal force
due to rotation of the cylinder and viscous damping generates different
patterns of entrainment such as cusp formation, entrained air wrapping,
ejection of bubble, and penetration of wrap inside entrainment. Variation
of wrapped liquid thickness at the receding end is also studied for
a wide range of Morton number and rotational speed. Finally, using
scale analysis, we showed that viscosity plays a major role in deciding
the azimuthal wrap thickness.