Thermal Relaxation Rate in Viscous Multi-Temperature Gas Flows

2011 ◽  
Author(s):  
E. V. Kustova
Keyword(s):  
Relaxation Rate ◽  
Thermal Relaxation ◽  
Gas Flows

General Properties of Thermal-Relaxation Rate Equations

1973 ◽  
Vol 8 (7) ◽  
pp. 3487-3487
Author(s):  
M. W. P. Strandberg ◽  
J. R. Shane
Keyword(s):  
Relaxation Rate ◽  
Thermal Relaxation ◽  
Rate Equations ◽  
General Properties

General Properties of Thermal-Relaxation Rate Equations

1973 ◽  
Vol 7 (11) ◽  
pp. 4809-4812 ◽  
Author(s):  
M. W. P. Strandberg ◽  
J. R. Shane
Keyword(s):  
Relaxation Rate ◽  
Thermal Relaxation ◽  
Rate Equations ◽  
General Properties

scholarly journals Vertical Transition in Transport and Mixing in Baroclinic Flows

2008 ◽  
Vol 65 (4) ◽  
pp. 1137-1157 ◽  
Author(s):  
M. D. Greenslade ◽  
P. H. Haynes
Keyword(s):  
Relaxation Rate ◽  
Channel Model ◽  
Gaussian Function ◽  
Plane Channel ◽  
Lower Boundary ◽  
Thermal Relaxation ◽  
Vertical Shear ◽  
Large Set ◽  
Transport Barrier ◽  
Transport And Mixing

Abstract Numerical simulations in multilevel baroclinic turbulence in a β-plane channel model are discussed, focusing on the transport and mixing behavior. The temperature field in the model is relaxed toward a field consistent with a broad zonal jet with vertical shear that is a Gaussian function of the cross-channel coordinate. The resulting statistical equilibrium flow includes an active baroclinic eddy field. The transport and mixing properties are analyzed by considering the fields of potential vorticity and a passive tracer (from which effective diffusivities/equivalent lengths are calculated). The upper part of the flow organizes itself in such a way that there is a transport barrier in the center of the channel, with eddy mixing regions on either side. In the lower part of the flow the eddy mixing occurs across a single broad region, with no central transport barrier. The transition between these two regimes takes place abruptly at a height zT. A large set of simulations is used to map out the variation of zT as a function of external parameters including β, the thermal relaxation rate κT, and the (lower boundary) frictional relaxation rate κM (applied in the lowest model layer only). The transition height zT is argued to be relevant to sharp vertical transitions in transport and mixing observed in atmospheric and oceanic flows.

scholarly journals Field-dependent prefactor of the thermal relaxation rate in single-domain magnetic particles

1993 ◽  
Vol 48 (21) ◽  
pp. 15823-15828 ◽  
Author(s):  
Ivo Klik ◽  
Ching-Ray Chang ◽  
Huei Li Huang
Keyword(s):  
Relaxation Rate ◽  
Magnetic Particles ◽  
Thermal Relaxation ◽  
Single Domain ◽  
Field Dependent

Nonmonotonic dependence of magnetic viscosity on thermal relaxation rate

1995 ◽  
Vol 52 (5) ◽  
pp. 3053-3055
Author(s):  
J. Lee ◽  
Ivo Klik ◽  
Ching-Ray Chang
Keyword(s):  
Relaxation Rate ◽  
Thermal Relaxation ◽  
Nonmonotonic Dependence ◽  
Magnetic Viscosity

In Situ Observation of Catalyzed Gasification of Graphite by Nickel

1981 ◽  
Vol 39 ◽  
pp. 76-77
Author(s):  
R. T. K. Baker ◽  
R. D. Sherwood
Keyword(s):  
Objective Lens ◽  
In Situ Observation ◽  
Gas Flows ◽  
Catalytic Gasification ◽  
Television Camera ◽  
Viewing Screen ◽  
Fuels And Chemicals ◽  
Gasification Of Carbon ◽  
Transmission Microscope

The catalytic gasification of carbon at high temperature by microscopic size metal particles is of fundamental importance to removal of coke deposits and conversion of refractory hydrocarbons into fuels and chemicals. The reaction of metal/carbon/gas systems can be observed by controlled atmosphere electron microscopy (CAEM) in an 100 KV conventional transmission microscope. In the JEOL gas reaction stage model AGl (Fig. 1) the specimen is positioned over a hole, 200μm diameter, in a platinum heater strip, and is interposed between two apertures, 75μm diameter. The control gas flows across the specimen and exits through these apertures into the specimen chamber. The gas is further confined by two apertures, one in the condenser and one in the objective lens pole pieces, and removed by an auxiliary vacuum pump. The reaction zone is <1 mm thick and is maintained at gas pressure up to 400 Torr and temperature up to 1300<C as measured by a Pt-Pt/Rh 13% thermocouple. Reaction events are observed and recorded on videotape by using a Philips phosphor-television camera located below a hole in the center of the viewing screen. The overall resolution is greater than 2.5 nm.

Sign in / Sign up

Export Citation Format

Share Document