Role of Solid Wall Properties in the Interface Slip of Liquid in Nanochannels

Gao, Wei; Zhang, Xuan; Han, Xiaotian; Shen, Chaoqun

doi:10.3390/mi9120663

Cited by 9 publications

(3 citation statements)

References 56 publications

(60 reference statements)

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“…The interaction of a fluid with a wall can be extremely complex, especially when the wall possesses small-scale features [1]. Typically, complexities arise in the form of slip layers [2,3] and other complicated boundary conditions [4][5][6]. Slip layers are observed when the fluid, at the fluid-wall interface, flows at a different velocity than the wall itself [6].…”

Section: Introductionmentioning

confidence: 99%

Quantitative coarse graining of laminar fluid flow penetration in rough boundaries

Majhi,

Kool,

van der Gucht

et al. 2024

Front. Phys.

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The interaction between a fluid and a wall is described with a certain boundary condition for the fluid velocity at the wall. To understand how fluids behave near a rough wall in a completely laminar flow regime, the fluid velocity at every point on the rough surface may be provided. This approach requires detailed knowledge of, and likely depends strongly on the roughness. Another approach of modelling the boundary conditions of a rough wall is to coarse grain and extract a penetration depth over which on average the fluid penetrates into the roughness. In this work, we examine the impact of well-defined patterned surfaces on the fluid flow behaviour. We considered two extreme cases: one with horizontal ridges and another with vertical ridges on the wall and an intermediate case with ridges at an angle on the wall. We show that for a broad range of periodic roughness patterns and relative flow velocities, a universal penetration depth function can be obtained. We obtain these results with experiments and complementary numerical simulations. We evaluate how this penetration depth depends on the various roughness parameters such as ridge depth, ridge spacing and ridge angle. Our results present a novel approach to investigating wall roughness boundary conditions by considering the penetration depth δ that captures the spatially averaged behaviour of the decaying velocity profile between the asperities. We find that this penetration depth δ can be rescaled into a simple exponential master curve δ = δ∞(1 − e−kD/S) for horizontal ridges with varying depth D and spacing S. A similar variation of δ with D and S is observed for vertical ridges, but with a smaller magnitude δ∞, while for ridges at an angle, the penetration depth lies between the two extreme cases.

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Section: Introductionmentioning

confidence: 99%

Quantitative coarse graining of laminar fluid flow penetration in rough boundaries

Majhi,

Kool,

van der Gucht

et al. 2024

Front. Phys.

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“…The interaction of a fluid with a wall can be very complex, especially when the wall possesses small-scale features [1]. Typically, complexities arise in the form of slip layers [2,3] and other complicated boundary conditions [4]. These wall-fluid interactions can, however, be tuned to control the fluid flow behaviour further away from the wall.…”

Section: Introductionmentioning

confidence: 99%

Quantitative coarse graining of laminar fluid flow penetration in rough boundaries

Majhi¹,

Kool²,

Gucht³

et al. 2022

Preprint

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The interaction between a fluid and a wall is described with a certain boundary condition for the fluid velocity at the wall. To understand how fluids behave near a rough wall, the fluid velocity at every point of the rough surface may be provided. This approach requires detailed knowledge of, and likely depends strongly on the roughness. Another approach of modeling the boundary conditions of a rough wall is to coarse grain and extract a penetration depth over which on average the fluid penetrates into the roughness. In this work we show that for a broad range of periodic roughness patterns and relative flow velocities, a universal penetration depth function can be obtained. We obtain these results with experiments and complementary numerical simulations.Our results show that wall roughness boundary conditions can be captured with an average "slip length" and so indicate that surface patterning yields extensive control over wall slip.

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“…These microstructures are known to have significant effects on wettability of liquids [4,5,6] and are expected to be able to control water–surface interactions and wettability by changing the size of wall structures [7,8]. Wettability of metals and nanostructures changes the friction of objects, chemical reaction on the surface, and crystallization of proteins [9,10,11,12,13,14,15]. Mirco-nanosurface is also expected to be used as a highly efficient heat transport device.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of the Influence of Nanoscale Structure on Water Wetting and Condensation

et al. 2019

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Recent advances in the microfabrication technology have made it possible to control surface properties at micro- and nanoscale levels. Functional surfaces drastically change wettability and condensation processes that are essential for controlling of heat transfer. However, the direct observation of condensation on micro- and nanostructure surfaces is difficult, and further understanding of the effects of the microstructure on the phase change is required. In this research, the contact angle of droplets with a wall surface and the initial condensation process were analyzed using a molecular dynamics simulation to investigate the impact of nanoscale structures and their adhesion force on condensation. The results demonstrated the dependence of the contact angle of the droplets and condensation dynamics on the wall structure and attractive force of the wall surface. Condensed water droplets were adsorbed into the nanostructures and formed a water film in case of a hydrophilic surface.

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Role of Solid Wall Properties in the Interface Slip of Liquid in Nanochannels

Cited by 9 publications

References 56 publications

Quantitative coarse graining of laminar fluid flow penetration in rough boundaries

Quantitative coarse graining of laminar fluid flow penetration in rough boundaries

Quantitative coarse graining of laminar fluid flow penetration in rough boundaries

Molecular Dynamics Simulation of the Influence of Nanoscale Structure on Water Wetting and Condensation

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