Non-equilibrium sound propagation using the orientation-free discrete kinetic theory

2004 ◽  
Vol 29 (1) ◽  
Author(s):  
R. Kwang-Hua Chu ◽  
Y. Jin ◽  
J. Fang
Keyword(s):  
Kinetic Theory ◽  
Sound Propagation ◽  
Non Equilibrium

scholarly journals Kinetic theory for non-equilibrium stationary states in long-range interacting systems

2012 ◽  
Vol 2012 (01) ◽  
pp. L01002 ◽  
Author(s):  
Cesare Nardini ◽  
Shamik Gupta ◽  
Stefano Ruffo ◽  
Thierry Dauxois ◽  
Freddy Bouchet
Keyword(s):  
Kinetic Theory ◽  
Long Range ◽  
Stationary States ◽  
Interacting Systems ◽  
Non Equilibrium

Acoustic field and the entropy mode induced by it in a waveguide filled with some non-equilibrium gases

Open Physics ◽  
2013 ◽  
Vol 11 (3) ◽  
Author(s):  
Anna Perelomova
Keyword(s):  
Acoustic Field ◽  
Sound Propagation ◽  
Mean Value ◽  
Leading Order ◽  
Acoustic Beam ◽  
Weakly Nonlinear ◽  
Equilibrium Processes ◽  
Non Linear Propagation ◽  
Linear Propagation ◽  
Non Equilibrium

AbstractThe non-linear propagation of an acoustic beam in a rectangular waveguide is considered. The medium of sound propagation, is a gas where thermodynamically non-equilibrium processes take place: such as exothermic chemical reactions or excitation of vibrational degrees of a molecule’s freedom. The incident and reflected compounds of the acoustic field do not interact in the leading order in the case of periodic weakly nonlinear sound with zero mean value of velocity. The acoustic heating or cooling in a waveguide is discussed.

scholarly journals Non-equilibrium effects on flow past a circular cylinder in the slip and early transition regime

2018 ◽  
Vol 860 ◽  
pp. 654-681 ◽  
Author(s):  
Xiao-Jun Gu ◽  
Robert W. Barber ◽  
Benzi John ◽  
David R. Emerson
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Kinetic Theory ◽  
Knudsen Number ◽  
Flow Separation ◽  
Velocity Slip ◽  
Transition Regime ◽  
Flow Past ◽  
Non Equilibrium ◽  
Early Transition

This paper presents a comprehensive investigation into flow past a circular cylinder where compressibility and rarefaction effects play an important role. The study focuses on steady subsonic flow in the Reynolds-number range 0.1–45. Rarefaction, or non-equilibrium, effects in the slip and early transition regime are accounted for using the method of moments and results are compared to data from kinetic theory obtained from the direct simulation Monte Carlo method. Solutions obtained for incompressible continuum flow serve as a baseline to examine non-equilibrium effects on the flow features. For creeping flow, where the Reynolds number is less than unity, the drag coefficient predicted by the moment equations is in good agreement with kinetic theory for Knudsen numbers less than one. When flow separation occurs, we show that the effects of rarefaction and velocity slip delay flow separation and will reduce the size of the vortices downstream of the cylinder. When the Knudsen number is above 0.028, the vortex length shows an initial increase with the Reynolds number, as observed in the standard no-slip continuum regime. However, once the Reynolds number exceeds a critical value, the size of the downstream vortices decreases with increasing Reynolds number until they disappear. An existence criterion, which identifies the limits for the presence of the vortices, is proposed. The flow physics around the cylinder is further analysed in terms of velocity slip, pressure and skin friction coefficients, which highlights that viscous, rarefaction and compressibility effects all play a complex role. We also show that the local Knudsen number, which indicates the state of the gas around the cylinder, can differ significantly from its free-stream value and it is essential that computational studies of subsonic gas flows in the slip and early transition regime are able to account for these strong non-equilibrium effects.

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