Results 11 to 20 of about 15,542 (295)
Micromachines, 2020 Molecular dynamics (MD) simulations are conducted to determine energy and momentum accommodation coefficients at the interface between rarefied gas and solid walls. The MD simulation setup consists of two parallel walls, and of inert gas confined between
Shahin Mohammad Nejad +3 more
doaj +3 more sources
Dissipative mass flux and sound wave propagations in monatomic gases [PDF]
, 2011 Predicting sound wave dispersion in monatomic gases is a fundamental gas flow problem in rarefied gas dynamics. The Navier-Stokes-Fourier model is known to fail where local thermodynamic equilibrium breaks down.
Dadzie, Kokou, Reese, Jason
core +1 more source
The effect of system boundaries on the mean free path for confined gases
AIP Advances, 2013 The mean free path of rarefied gases is accurately determined using Molecular Dynamics simulations. The simulations are carried out on isothermal argon gas (Lennard-Jones fluid) over a range of rarefaction levels under various confinements (unbounded gas,
Sooraj K. Prabha +3 more
doaj +1 more source
On the accuracy of macroscopic equations for linearized rarefied gas flows
Advances in Aerodynamics, 2020 Many macroscopic equations are proposed to describe the rarefied gas dynamics beyond the Navier-Stokes level, either from the mesoscopic Boltzmann equation or some physical arguments, including (i) Burnett, Woods, super-Burnett, augmented Burnett ...
Lei Wu, Xiao-Jun Gu
doaj +1 more source
Simulating fluid flows in micro and nano devices : the challenge of non-equilibrium behaviour [PDF]
, 2009 We review some recent developments in the modelling of non-equilibrium (rarefied) gas flows at the micro- and nano-scale, concentrating on two different but promising approaches: extended hydrodynamic models, and lattice Boltzmann methods.
Reese, Jason M., Zhang, Yonghao
core +1 more source
INVARIANT IMBEDDING AND RAREFIED GAS DYNAMICS [PDF]
Proceedings of the National Academy of Sciences, 1963 Invariance principles and invariant imbedding techniques are applied to representative problems in the kinetic theory of gases. The problem of plane shear flow between two infinite flat plates is used to present the ideas of invariant imbedding in the context of rarefied gas dynamics.
Aroesty, J. +3 more
openaire +2 more sources
Comparing macroscopic continuum models for rarefied gas dynamics : a new test method [PDF]
, 2006 We propose a new test method for investigating which macroscopic continuum models, among the many existing models, give the best description of rarefied gas flows over a range of Knudsen numbers.
Reese, Jason +2 more
core +1 more source
Evaporation Boundary Conditions for the Linear R13 Equations Based on the Onsager Theory
Entropy, 2018 Due to the failure of the continuum hypothesis for higher Knudsen numbers, rarefied gases and microflows of gases are particularly difficult to model.
Alexander Felix Beckmann +3 more
doaj +1 more source
Effect of Different Surface Microstructures in the Thermally Induced Self-Propulsion Phenomenon
Micromachines, 2022 In micro/nano-scale systems where the characteristic length is in the order of or less than the mean free path for gas molecules, an object placed close to a heated substrate with a surface microstructure receives a propulsive force.
Clint John Cortes Otic, Shigeru Yonemura
doaj +1 more source
Numerical simulation of moving rigid body in rarefied gases [PDF]
, 2014 In this paper we present a numerical scheme to simulate a moving rigid body with arbitrary shape suspended in a rarefied gas. The rarefied gas is simulated by solving the Boltzmann equation using a DSMC particle method.
Hardt, Steffen +3 more
core +1 more source