Analysis of gas-surface scattering models based on computational molecular dynamics

Yakunchikov, Artem; Kovalev, V. L.; Utyuzhnikov, Sergey

doi:10.1016/j.cplett.2012.10.030

Cited by 29 publications

(18 citation statements)

References 7 publications

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“…The choice of the theoretical model to describe scattering in a number of problem appears to be fundamental. For example, the use of specular-diffusion Maxwell model in the problem of thermal transpiration leads to results qualitatively different from experiments [9], and the Cercignani-Lampis scattering kernel does not allow the dependence of the energy and momentum conservation coefficients on the energy of incident gas molecules [10]. In the present work, calculations were conducted using Maxwell scattering kernel with full energy and impulse accommodation which is the extreme case for all scattering models.…”

Section: Problem Statementmentioning

confidence: 99%

Study of gas separation by the means of high-frequency membrane oscillations

2015

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Section: Problem Statementmentioning

confidence: 99%

Study of gas separation by the means of high-frequency membrane oscillations

2015

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“…Choice of the scattering model in a number of problems plays significant role. For example, using of the Maxwell scattering kernel for simulation of thermomolecular pressure difference (TPD) leads to results qualitative different from experiments (Sharipov 2002), Cercignani-Lampis scattering kernel does not allow dependence of the energy and momentum accommodation coefficients from energies of incident gas molecules (Yakunchikov et al 2012).…”

Section: Gas-wall Interactionmentioning

confidence: 99%

Free-molecular gas flow through the oscillating membrane

Yakunchikov

Kovalev

Kosiantchouk

2014

Microfluid Nanofluid

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the main distinguishing features of the track membranessmall thickness and high uniformity of the pore size.In this paper, the possibility of using a high-frequency oscillating track membranes as diffusion membranes for gas separation was studied. High-frequency forced oscillation of the membrane was considered because of assumption that the membrane conductivity for a given gas can be controlled by varying the frequency and amplitude of oscillation. The problem about free-molecular gas flow through a oscillating in its plane membrane was stated, and the possibility of separation of gases using such a device was investigated. Problem statementThe gas flow through moving membrane was studied. Membrane was simulated by rigid body with straight cylindrical channels. Channels length was L (thickness of membrane), channels radius was R, and channels axis was perpendicular to the membrane surface (see Fig. 1). Membrane was placed between two tanks (1) and (2) with constant pressures P 1 , P 2 and temperatures T 1 , T 2 (T 1 = T 2 = T w , where T w -temperature of membrane material).Main assumptions:1. Gas flow inside channel is free-molecular. 2. Velocity distribution for molecules entering from tanks is equilibrium corresponding to tank temperature. 3. All membrane channels are equal-cylinders with length L and radius R. 4. Membrane moves as absolutely rigid body. Law of membrane motion: x = x 0 , y = y 0 + A sin (ωt + φ), z = z 0 . 5. Channel wall temperature T w is maintained constant. AbstractThe free-molecular gas flow through the membrane oscillating in its own plane was studied. Passing probability and velocity distribution function of gas molecules in the membrane were calculated depending on the dimensionless parameters characterizing the geometry of membrane channels, gas molecule mass, gas temperature, frequency and amplitude of the membrane oscillation. It has shown that the conductivity of the membrane for a given gas can be controlled by changing the parameters of forced oscillations.

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“…Choice of the scattering model in a number of problems plays significant role. For example, using of the Maxwell scattering kernel for simulation of thermomolecular pressure difference (TPD) leads to results qualitative differ from experiments [7], Cercignani-Lampis scattering kernel does not allow dependence of the energy and momentum accommodation coefficients from energies of incident gas molecules [8].…”

Section: Gas-wall Interactionmentioning

confidence: 99%

Free-molecular gas flow through the high-frequency oscillating membrane

Yakunchikov¹,

Kovalev²,

Kosiantchouk³

2014

AIP Conference Proceedings

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The free-molecular gas flow through the membrane oscillating in its own plane was studied. Passing probability and velocity distribution function of gas molecules in the membrane were calculated depending on the dimensionless parameters characterizing the geometry of membrane channels, gas molecule mass, gas temperature, frequency and amplitude of the membrane oscillation. It has shown that the conductivity of the membrane for a given gas can be controlled by changing the parameters of forced oscillations.

show abstract

Analysis of gas-surface scattering models based on computational molecular dynamics

Cited by 29 publications

References 7 publications

Study of gas separation by the means of high-frequency membrane oscillations

Study of gas separation by the means of high-frequency membrane oscillations

Free-molecular gas flow through the oscillating membrane

Free-molecular gas flow through the high-frequency oscillating membrane

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