Stress-gradient induced migration of polymers in thin films flowing over smoothly corrugated surfaces
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- 作者：Sophia Tsouka ; Yannis Dimakopoulos ; dimako@chemeng.upatras.gr" class="auth_mail" title="E-mail the corresponding author ; John Tsamopoulos
- 关键词：Film flow over topography ; Viscoelastic fluids ; Stress-induced migration ; Finite element solution
- 刊名：Journal of Non-Newtonian Fluid Mechanics
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：228
- 期：Complete
- 页码：79-95
- 全文大小：6014 K
文摘
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We model the flow of a dilute polymer solution over a solid substrate with periodic topography.
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A two-fluid Hamiltonian model is used in order to account for polymer migration due to stress gradients.
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Increasing the elastic stresses, increases migration of macromolecules towards the free surface.
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A polymer-depleted layer develops over the substrate maxima, which gives rise to “apparent” slip.