Browsing by Subject "Kinetic theory"
Now showing items 117 of 17

Conductive heat transfer in a rarefied polyatomic gas confined between coaxial cylinders
(2014)The conductive heat transfer through rarefied gases composed by rigid rotators and confined between coaxially placed cylinders maintained at different temperatures is investigated on the basis of the Holway and Rykov kinetic ... 
Conductive heat transfer in rarefied polyatomic gases confined between parallel plates via various kinetic models and the DSMC method
(2015)The conductive heat transfer through rarefied polyatomic gases confined between parallel plates maintained at different temperatures is investigated. The approach is based on three kinetic models namely the Holway, Rykov ... 
Design and optimization of a Holweck pump via linear kinetic theory
(2012)The Holweck pump is widely used in the vacuum pumping industry. It can be a self standing apparatus or it can be part of a more advanced pumping system. It is composed by an inner rotating cylinder (rotor) and an outer ... 
End corrections for rarefied gas flows through circular tubes of finite length
(2014)A method to take into account the influence of the inlet/outlet ends on rarefied gas flows through moderately long capillaries proposed previously [Vacuum 97, 26 (2013)] is applied to gas flows through circular tubes. The ... 
Estimation of the Poiseuille number in gas flows through rectangular nano and microchannels in the whole range of the Knudsen number
(2009)Based on a recent work (Valougeorgis, Phys. Fluis 19(9):091701.1091701.4, 2007), the Poiseuille number for gas flows through channels of orthogonal cross sections is estimated in the whole range of the Knudsen number from ... 
The friction factor of a rarefied gas flow in a circular tube
(2007)An expression for the estimation of the Poiseuille number for internal rarefied flows is developed. The derived formula is given in terms of dimensionless quantities, which are obtained by the solution of the flow based ... 
Gassurface scattering effect on vacuum gas flows through rectangular channels
(2011)Flow of a rarefied gas through a channel of rectangular cross section is investigated numerically and experimentally. Emphasis is given on the study of the molecular scattering law influence at the wall boundary surfaces. ... 
Heat transfer through rarefied gases between coaxial cylindrical surfaces with arbitrary temperature difference
(2010)The problem of nonlinear heat transfer through a rarefied gas confined between concentric cylinders maintained at different temperatures is investigated. The formulation is based on the nonlinear Shakhov kinetic model ... 
The McCormack model: Channel flow of a binary gas mixture driven by temperature, pressure and density gradients
(2004)An analytical version of the discreteordinates method (the ADO method) is used to establish concise and particularly accurate solutions to the problems of Poiseuille flow, thermalcreep flow and diffusion flow for a binary ... 
Modeling of ITER related vacuum gas pumping distribution systems
(2013)A novel algorithm recently developed to solve steadystate isothermal vacuum gas dynamics flows through pipe networks consisting of long tubes is extended to include, in addition to long channels, channels of moderate ... 
Nonlinear vacuum gas flow through a short tube due to pressure and temperature gradients
(2013)The flow of a rarefied gas through a tube due to both pressure and temperature gradients has been studied numerically. The main objective is to investigate the performance of a mechanical vacuum pump operating at low ... 
Oscillatory heating in a microchannel at arbitrary oscillation frequency in the whole range of the Knudsen number
(2012)The oscillatory heating in a microchannel is investigated on the basis of linear kinetic theory. In particular, the linearized unsteady Shakhov kinetic model, subject to Maxwell boundary conditions is numerically solved ... 
Pressure driven rarefied gas flow through a slit and an orifice
(2012)The flow of a monatomic gas through a slit and an orifice due to an arbitrarily large pressure difference is examined on the basis of the nonlinear BhatnagarGrossKrook (BGK) model equation, subject to Maxwell diffuse ... 
Rarefied gas flow in a triangular duct based on a boundary fitted lattice
(2008)The rarefied fully developed flow of a gas through a duct of a triangular cross section is solved in the whole range of the Knudsen number. The flow is modelled by the BGK kinetic equation, subject to Maxwell diffuse ... 
Rarefied gas flow through a cylindrical tube due to a small pressure difference
(2013)Flow of a rarefied gas through a cylindrical tube connecting two reservoirs maintained at a small pressure difference is considered using the axisymmetric version of the linearised BGK kinetic model equation subject to ... 
Results on the viscous slip coefficient for binary gas mixtures
(2008)The viscous slip coefficients for the binary gas mixtures of NeAr, HeAr and HeXe are estimated by solving the McCormack kinetic model equation subject to Maxwell diffusespecular scattering boundary conditions. The ... 
Unsteady vacuum gas flow in cylindrical tubes
(2011)The starting gas flow in a cylindrical channel is investigated in the whole range of the Knudsen number by numerically solving the governing time dependent kinetic equations in a fully deterministic manner. The gas is ...