Viscous flow on the outside of a horizontal rotating cylinder—III. Selective coating of two immiscible fluids

✍ Scribed by Osvaldo H. Campanella; Ramón Luis Cerro

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 595 KB
• Volume: 41
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(86)80002-1

✦ Synopsis

Experimental and theoretical analyses of the flow of two immiscible fluids on the outside surface of a horizontal rotating cylinder show three regions of well-defined behaviour separated by two, catastrophiclike transitions. These regions of flow are: (a) low removal velocities-there is a moving, dynamic contact line on the cylinder surface, between the two fluid regions; only the top, tighter fluid is coated; (b) intermediate removal vehxities-the moving contact line disappears, and is "sucked up" by the movement of the solid surface; both fluids are coated, and (c) large removal velocitiesthe lighter fluid layer cannot approach the surface of the cylinder and only the bottom, heavier layer is coated.