Development of empirical relationships for surface accommodation coefficients through investigation of nano-poiseuille flows using molecular dynamics method

Kammara, Kishore K.; Kumar, Rakesh

doi:10.1007/s10404-020-02375-x

Cited by 13 publications

(3 citation statements)

References 49 publications

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“…We acknowledge that in the context of our nanometric geometry, the application of established equations such as the Poiseuille equation and Taylor’s characteristic equation may raise questions. However, the Poiseuille equation is commonly applied to describe the flow in micro- and nanoscale channels under certain conditions, including laminar and fully developed flows. − While our system features nanometric geometries, the use of the Poiseuille equation is justified by the laminar nature of the flow and the steady-state conditions achieved during our simulations. We acknowledge that these conditions are essential for the equation’s validity and emphasize that our system meets these criteria.…”

Section: Results and Discussionmentioning

confidence: 99%

Active Solid-State Nanopores: Self-Driven Flows/Chaos at the Liquid–Gas Nanofluidic Interface

Johny,

Ghosh

2023

Langmuir

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Here, we present a comprehensive study of self-driven flow dynamics at the liquid–gas interface within nanofluidic pores in the absence of external driving forces. The investigation focuses on the Rayleigh–Taylor instability phenomena that occur in sub-100 nm scale fluidic pores interfacing between 2 μm scale water and air reservoir. We obtain a flow velocity equation, and we validate it using simulations, concentrating on the mass transfer efficiency of these flow structures. Furthermore, we introduce the concept—“active solid-state nanopore”—that exhibits a self-driven flow switching behavior, transitioning between active and passive states without the need for mechanical components. We found a unique state of chaos at the nanoscale resembling the chaotic motion of fluid. This study contributes to the preliminary understanding of fluid dynamics at the classical–quantum interface. Implications of self-driven nanofluidics extend across diverse fields from biosensing and healthcare applications to advancing net-zero sustainable energy production and contributing to the fundamental understanding of fluid dynamics in confined spaces.

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Section: Results and Discussionmentioning

confidence: 99%

Active Solid-State Nanopores: Self-Driven Flows/Chaos at the Liquid–Gas Nanofluidic Interface

Johny,

Ghosh

2023

Langmuir

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“…In micro-electro-mechanical system (MEMS) devices, as the dimension of the system becomes smaller and smaller, the surface effects get more dominant. Therefore, having accurate gas-surface interaction models is crucial to evaluate relationship between the velocity distribution functions of the incident and reflected gas molecules [36].…”

Section: Mamentioning

confidence: 99%

A review of rarefied gas flow in irregular micro/nanochannels

Taassob

Bordbar

Kheirandish

et al. 2021

J. Micromech. Microeng.

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In today’s complex micro–electro–mechanical systems (MEMS), investigation of flow through irregular micro/nanochannels, such as bended channels, variable cross-sectional area channels, and those with rough surfaces, can contribute considerably to efficient designing of the microdevices and to gain a better understanding of the flow structure in these geometries. The present paper reviews the prominent studies published in literature on rarefied gas flow through these types of complex geometries. The main focus of the study is to explore the physical aspects of the findings and the analyses provided in support of the results. Finally, the areas in which a gap exists in literature and could be subjects of future studies are introduced.

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“…Obviously, the uncertainty in thermal accommodation can lead to more errors in heat conduction modellings. , So this issue has been explored theoretically, − numerically, − and experimentally. , Among these efforts, Molecular Dynamics (MD) simulation has delivered remarkable advances. ,− Rabani et al studied the influence of the temperature difference between two channel walls on gas molecular distribution and heat transfer. They then analyzed the effect of surface properties on gas heat conduction.…”

Section: Introductionmentioning

confidence: 99%

How Gas–Solid Interaction Matters in Graphene-Doped Silica Aerogels

et al. 2022

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It was interesting to experimentally find that the thermal insulation of silica aerogels was improved by doping graphene sheets with high heat conductivity. The underlying mechanism is investigated in the present work from the perspective of gas−solid interaction using a comprehensive analysis of molecular dynamics (MD) simulations, theoretical modeling, and experimental data. The MD-modeled small pores are demonstrated to effectively represent big pores in silica aerogels because of similar heat conduction physics, because it is found that adsorption does not contribute to gas heat conduction. Meanwhile, based on the experimentally measured density, the porous structures are schematically re-engineered using molecular modeling for the first time. The evaluated pore size distributions numerically present a consistency with available experimental data. Inspired by the visualization of the 3D pore structure, we proposed a graphene/silica/nitrogen model to evaluate the role of graphene in heat conduction: it can not only reduce effective gas collision (impede heat transport) but also enhance the gas−solid coupling effect. The former is dominant because of the high porosity, leading to an improvement in thermal insulation. The competition between them can be the reason for the "trade-off" phenomenon in the graphene doping effect in the available experiment.

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Development of empirical relationships for surface accommodation coefficients through investigation of nano-poiseuille flows using molecular dynamics method

Cited by 13 publications

References 49 publications

Active Solid-State Nanopores: Self-Driven Flows/Chaos at the Liquid–Gas Nanofluidic Interface

Active Solid-State Nanopores: Self-Driven Flows/Chaos at the Liquid–Gas Nanofluidic Interface

A review of rarefied gas flow in irregular micro/nanochannels

How Gas–Solid Interaction Matters in Graphene-Doped Silica Aerogels

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