Effects of London-van der Waals forces on the thinning and rupture of a dimpled liquid film as a small drop or bubble approaches a fluid-fluid interface
| Autor: | John C. Slattery, Phil-Soo Hahn, Jing-Den Chen |
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| Rok vydání: | 1985 |
| Předmět: |
Environmental Engineering
Chemistry General Chemical Engineering Drop (liquid) Bubble Disjoining pressure Fracture mechanics Mechanics Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics symbols.namesake Liquid film Condensed Matter::Superconductivity symbols Physical chemistry Thin film van der Waals force Hydrodynamic theory Biotechnology |
| Zdroj: | AIChE Journal. 31:2026-2038 |
| ISSN: | 1547-5905 0001-1541 |
| DOI: | 10.1002/aic.690311212 |
| Popis: | When a small drop or bubble approaches a fluid-fluid interface, a thin liquid film forms between them and begins to drain. As the thickness of the draining film become sufficiently small [about 1,000 A (100 nm)], the effects of the London-van der Waals forces and of the repulsive force of any electrostatic double layer become important. Lin and Slattery (1982b) developed a hydrodynamic theory for the first portion of the coalescence process: the drainage of the thin liquid film while it is sufficiently thick that the effects of London-van der Waals forces and of electrostatic forces can be ignored. Here the effect of the London-van der Waals forces are included. Given only the drop radius and the required physical properties, the configuration of the film as a function of time is predicted. For the case of a negative disjoining pressure, it is possible to estimate an upper bound for the coalescence time or the time during which a small drop or bubble appears to rest at a phase interface before it coalesces under the influence of London-van der Waals forces. |
| Databáze: | OpenAIRE |
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