| Autor: |
Wee H; Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA., Wagoner BW; Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA., Kamat PM; Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA., Basaran OA; Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA. |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2020 May 22; Vol. 124 (20), pp. 204501. |
| DOI: |
10.1103/PhysRevLett.124.204501 |
| Abstrakt: |
In addition to surface tension lowering and Marangoni stresses, surfactants also induce surface rheological effects when they deform against themselves at fluid interfaces. Because surface viscosities are functions of surfactant concentration, surface rheological stresses can compete with capillary, Marangoni, and bulk stresses in surfactant-laden free surface flows with breakup. To elucidate the effects of surface rheology, we examine the breakup of a Stokes thread covered with a monolayer of insoluble surfactant when either surfactants are convected away from the space-time singularity or diffusion is dominant. Surprisingly, in both limits, surface rheological effects always enter the dominant balance of forces and alter the thread's thinning rate. Moreover, if surfactants are convected away from the singularity, we provide an analytical expression for thinning rate that explicitly depends on surface rheological parameters, providing a simple route for measuring surface viscosity. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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