Fig. 2: Velocity profiles for a three-dimensional drop moving to the right on lubricated pillars, as viewed in the center-of-mass frame of the drop.
From: Direct visualization of viscous dissipation and wetting ridge geometry on lubricant-infused surfaces
a–d Throughout this figure, Ca = 0.17, Bo = 0.6, and the lubricant (highlighted by the yellow contours) is 10 times more viscous than drop (cyan contours). The width of the pillars (in gray) is 5 lattice units. The length of the arrows is proportional to the magnitude of the velocity and the color of the arrows represents the ratio of the power dissipated at the position of the arrow to the power input per unit volume (Pin = fv) to drive the motion of the drop, as shown by the color bar at the bottom of the figure. a Velocity profile in a vertical slice through the center-of-mass of the drop indicates a rolling motion inside the drop. b Velocity profile in a horizontal slice just above (2 lattice units) the top of the pillars shows the flow of lubricant in the wetting ridge around the drop. c, d Zoomed-in perspective of the velocity profiles in (a), focusing on the rear and front wetting ridge, respectively.
