Ab initio modelling of transport phenomena in multi-component mixtures of rarefied gases

Sharipov, Felix

doi:10.1016/j.ijheatmasstransfer.2023.124906

International Journal of Heat and Mass Transfer

2024

DOI: 10.1016/j.ijheatmasstransfer.2023.124906

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Ab initio modelling of transport phenomena in multi-component mixtures of rarefied gases

Felix Sharipov

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2024

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Cited by 4 publications

References 49 publications

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A model of heat transfer from a cylinder in high-speed slip flow and determination of temperature jump coefficients using hot-wires

Barros,

Larchevêque,

Dupont

2024

International Journal of Heat and Fluid Flow

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A model of heat transfer from a cylinder in high-speed slip flow and determination of temperature jump coefficients using hot-wires

Barros,

Larchevêque,

Dupont

2024

International Journal of Heat and Fluid Flow

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Kinetic modelling of rarefied gas mixtures with disparate mass in strong non-equilibrium flows

Li,

Zeng,

2024

J. Fluid Mech.

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The simulation of rarefied gas flow based on the Boltzmann equation is challenging, especially when the gas mixtures have disparate molecular masses. In this paper, a computationally tractable kinetic model is proposed for monatomic gas mixtures, to mimic the Boltzmann collision operator as closely as possible. The intra- and inter-collisions are modelled separately using relaxation approximations, to correctly recover the relaxation time scales that could span several orders of magnitude. The proposed kinetic model preserves the accuracy of the Boltzmann equation in the continuum regime by recovering four critical transport properties of a gas mixture: the shear viscosity, the thermal conductivity, the coefficients of diffusion and the thermal diffusion. While in the rarefied flow regimes, the kinetic model is found to be accurate when comparing its solutions with those from the direct simulation Monte Carlo method in several representative cases (e.g. one-dimensional normal shock wave, Fourier flow and Couette flow, two-dimensional supersonic flow passing a cylinder and nozzle flow into a vacuum), for binary mixtures with a wide range of mass ratios, species concentrations and different intermolecular potentials. Pronounced separations in species properties have been observed, and the flow characteristics of gas mixtures in shock waves are found to change as the molecular mass ratio increases from 10 to 1000.

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Modeling the photophoretic force on a perforated membrane

Sharipov,

Schafer,

Keith

2024

Physics of Fluids

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The photophoretic force exerted on an illuminated membrane vanishes when its size is much larger than the molecular mean-free-path. Perforations in the membrane can increase the force, but they make modeling the gas flow more difficult. In the present letter, a new model of gas interaction with a perforated surface is proposed. The direct simulation Monte Carlo method is used to calculate the flow-field and photophoretic force exerted on a perforated membrane, showing a significant increase in the force at high rarefaction parameters. This effect could be used to levitate membranes of a few centimeters in size at mesospheric altitudes.

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Ab initio modelling of transport phenomena in multi-component mixtures of rarefied gases

Cited by 4 publications

References 49 publications

A model of heat transfer from a cylinder in high-speed slip flow and determination of temperature jump coefficients using hot-wires

A model of heat transfer from a cylinder in high-speed slip flow and determination of temperature jump coefficients using hot-wires

Kinetic modelling of rarefied gas mixtures with disparate mass in strong non-equilibrium flows

Modeling the photophoretic force on a perforated membrane

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