A review on slip boundary conditions at the nanoscale: recent development and applications

Rui-fei, Wang; Chai, Jin; Luo, Bobo; Liu, Xiong; Zhang, Jianting; Wu, Min; Wei, Mingdan; Ma, Zhuanyue

doi:10.3762/bjnano.12.91

Cited by 18 publications

(9 citation statements)

References 127 publications

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“…The concept of slip length was first proposed two centuries ago, at which time the no-slip boundary condition was universally accepted for a solid/liquid interface in fluid dynamics. During the last two decades, nanoscale and microscale fluidic technologies have been developed, such that the inherent assumption of a no-slip boundary condition was revisited throughout the literature, , especially in the scenario where solid surfaces have been coated or treated to become so-called “superhydrophobic” (hereafter referred to as “SHO” surfaces) . The large slip obtained from liquid/solid interfaces enables the SHO surfaces to potentially reduce drag in a flow, and the slip length, in return, is an ideal parameter to quantify the degree of drag reduction …”

Section: Introductionmentioning

confidence: 99%

Surface Tension and Viscosity Dependence of Slip Length over Irregularly Structured Superhydrophobic Surfaces

2022

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A comprehensive understanding of the slip phenomenon on liquid/solid interfaces is essential for multiple real-world applications of superhydrophobic materials, especially those involving drag reduction. In the current contribution, the so-called “slip-length” on an irregularly structured superhydrophobic surface was systematically evaluated, with respect to varying liquid surface tension and viscosity. The superhydrophobic polymer–nanoparticle composite (SPNC) material used exhibits a dual-scale surface roughness and was fabricated via coating a surface with a mixture of polydimethylsiloxane solution and functionalized silica particles. A cone-and-plate rheometric device was employed to quantify the slip length. To independently study the impact of surface tension and viscosity, three types of aqueous solutions were used: sodium dodecyl sulfate, ethanol, and polyethylene glycol. Our experimental results demonstrate that a decreasing surface tension results in a decreasing slip length when the fluid viscosity is held constant. Meanwhile, the slip length is shown to increase with increasing viscosity when the surface tension of the various liquids is matched to isolate effects. The study reveals a linear relationship between slip length and both capillary length and viscosity providing a reference to potentially predict the degree of achievable drag reduction for differing fluids on SPNC surfaces.

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Section: Introductionmentioning

confidence: 99%

Surface Tension and Viscosity Dependence of Slip Length over Irregularly Structured Superhydrophobic Surfaces

2022

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“…This slip length parameter measures the length beyond which the liquid velocity linearly extrapolates to zero (Wang et al. 2021). The initial and boundary conditions with slip effects are as follows (Mustafa 2017; Alqarni et al.…”

Section: Mathematical Equations For Ferrohydrodynamicsmentioning

confidence: 99%

Exploring slip effects of ferrofluid film flow over a slanted rough surface

Bhandari,

Parmar

2024

J. Fluid Mech.

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We examined the influences of slip parameters on the velocity and thermal characteristics of a ferrofluid film of fixed thickness. The flow is generated on a rough and inclined whirling surface that is positioned in an external magnetic (dipole) field. The similarity transformation reduces the model equations (continuity, momentum, energy and concentration), and the solution of the normalized coupled ordinary differential equations is carried out through the finite element process. The influences of slip effects, Brownian motion, thermophoresis and a heat source on the velocity (radial, tangential and axial), gravity (drainage, induced), temperature profile and concentration profile are determined. The tangential flow and temperature are both decreased by an increase in the velocity slip parameter, whereas drainage, induced, radial and axial flows are increased. Enlarging the thermal slip parameter decreases the temperature. Improving slip parameters (velocity and thermal) also improves the concentration profile. Both Nusselt and Sherwood numbers are found to improve on improving the velocity slip parameter, while they decrease on decreasing the thermal slip parameter. The results and insights from this work could be applied to a wide range of medicinal fields, such as targeted medication therapy and delivery, tissue engineering, etc. as well as different industrial processes including coating, lubrication, heat transfer, etc.

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“…[4] Due to the larger surface-to-volume ratio, micro/nano-scaled channels render the flow of the fluid more susceptible to surface properties such as roughness, hydrophobicity, and surface forces than in macro-scaled channels. [5][6] Currently, the control of fluid flow resistance at micro/nano scales stands as a key limiting factor in the development of micro/nano fluid systems. Therefore, how to reduce and control fluid flow resistance at these scales has become a hot topic in the field of microfluidics, which has important practical implications for enhancing the performance and long-term development of microfluidic systems.…”

Section: Intorductionmentioning

confidence: 99%

Influence of surface roughness on the fluid flow in microchannel

Li,

Zhang,

et al. 2024

J. Phys.: Conf. Ser.

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Surface roughness is a crucial factor of fluid flow in microfluidic channels. Most of the existing studies focus on the effect of regular microstructured surfaces on fluid flow, while researchs about the impact of random rough surfaces on fluid flow remains limited. Therefore, in this study, a random rough surface model and two microstructured surface models were established, and the effects surface roughness on the fluid flow at Wenzel state and Cassie-Baxter state were studied using COMSOL multi-physics simulation software. Our findings reveal that both the flow velocity and the fluid flow rate at the microchannel outlet decreases with the surface roughness increases. Notably, the flow rate and velocity of the fluid flow at Cassie-Baxter state is higher than that of fluid flow at Wenzel state.

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A review on slip boundary conditions at the nanoscale: recent development and applications

Cited by 18 publications

References 127 publications

Surface Tension and Viscosity Dependence of Slip Length over Irregularly Structured Superhydrophobic Surfaces

Surface Tension and Viscosity Dependence of Slip Length over Irregularly Structured Superhydrophobic Surfaces

Exploring slip effects of ferrofluid film flow over a slanted rough surface

Influence of surface roughness on the fluid flow in microchannel

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