Nernst–Wienecke equilibrium in linear magnetized plasmas

1979 ◽  
Vol 57 (8) ◽  
pp. 1090-1093 ◽  
Author(s):  
Boye Ahlborn
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Axial Magnetic Field ◽  
Hydrogen Plasma ◽  
Magnetized Plasmas ◽  
Radial Heat ◽  
Pressure Maximum

A cylindrical hydrogen plasma imbedded in a strong axial magnetic field, in which a temperature maximum is maintained by axial heating and radial heat transfer, has a pressure maximum and a density minimum on axis. The pressure in dyn/cm2 and density in cm−3 can be approximated as [Formula: see text]BT3/4 and [Formula: see text]BT−1/4 (B in gauss and T in kelvin).

Numerical Investigation of Laser Oscillation in a Recombining Hydrogen Plasma Interacting with Helium Gas in TPD-I

1985 ◽  
Vol 40 (5) ◽  
pp. 485-489 ◽  
Author(s):  
Toshiatsu Oda ◽  
Utaro Furukane
Keyword(s):  
Magnetic Field ◽  
Numerical Investigation ◽  
Axial Magnetic Field ◽  
Hydrogen Plasma ◽  
Plasma Source ◽  
Threshold Level ◽  
Laser Oscillation ◽  
Quantum Numbers ◽  
Magnetically Confined ◽  
Helium Gas

A numerical investigation on the basis of a collisional-radiative (CR) model has shown that laser oscillation between the levels with the principal quantum numbers i = 2 and 3 can be generated in a recombining hydrogen plasma interacting with a dense helium gas as a cooling medium in TPD-I, which is a magnetically confined quiescent high-density plasma source consisting basically of two parts, namely, the discharge region with the cathode at the center of the cusped magnetic field and the plasma column region with the axial magnetic field. The population inversion is found to exceed significantly a threshold level for the laser oscillation even in the quasi-steady state when the hydrogen plasma with ne = 1013 ~ 1014 cm−3 interacts with the helium gas with a pressure of about 50 Torr.

Druckerhöhung und Wärmeleitfähigkeit in einem zylindersymmetrischen Wasserstoffplasma im axialen Magnetfeld unter Berücksichtigung von Thermokräften

1968 ◽  
Vol 23 (11) ◽  
pp. 1695-1706
Author(s):  
J. Raeder ◽  
S. Wirtz
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Plasma Column ◽  
Thermal Equilibrium ◽  
Axial Magnetic Field ◽  
Hydrogen Plasma ◽  
Local Thermal Equilibrium ◽  
Total Thermal Conductivity ◽  
Boltzmann Equations ◽  
External Pressures

The pressure increase and total thermal conductivity are calculated for an infinitely long hydrogen plasma column in an axial magnetic field. The calculations, which are based on the first and third moments of the Boltzmann equations for atoms, ions and electrons, are carried out under the assumption of local thermal equilibrium. Numerical results are given for magnetic fields up to 150 kG, temperatures to 106°K and external pressures ranging from 103 to 105 dyne/cm2. Comparison of these results with previous calculations, which neglect thermal forces, shows that they cause an increase of pressure also in the completely ionized plasma and therefore modify the thermal conductivity indirectly.

Heat Transfer From Partially Ionized Gases in the Presence of an Axial Magnetic Field

1962 ◽  
Vol 84 (2) ◽  
pp. 169-176 ◽  
Author(s):  
V. J. Raelson ◽  
P. J. Dickerman
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Field Strength ◽  
Axial Magnetic Field ◽  
Plasma Generator ◽  
Ionized Gas ◽  
Test Channel ◽  
Boundary Layer Region ◽  
Partially Ionized ◽  
Layer Region

This work was performed in order to investigate the influence of an axial magnetic field on the flow properties and heat-transfer characteristics of a partially ionized gas in a cylindrical flow channel. A description of the plasma generator and test channel is given along with experimental results for heat-transfer measurements at the channel wall and flow conditions within the channel as a function of field strength. Data obtained show a heat-flux reduction to the walls of the order of 20 per cent for a field strength of 20 kilogauss with indications that the interaction is limited to the boundary-layer region.

Experimentelle Untersuchungen an einem Wasserstoff-Lichtbogen im achsenparallelen Magnetfeld. I.

1968 ◽  
Vol 23 (6) ◽  
pp. 867-873 ◽  
Author(s):  
C. Mahn ◽  
H. Ringler ◽  
G. Zankl
Keyword(s):  
Magnetic Field ◽  
Heat Conduction ◽  
Field Strength ◽  
Radial Direction ◽  
Axial Magnetic Field ◽  
Hydrogen Plasma ◽  
Power Input ◽  
Measured Temperature ◽  
Radial Temperature ◽  
Theoretical Predictions

In a stationary high density d. c. arc, the electric power input is balanced essentially by heat conduction losses in radial direction. These losses increase greatly with temperature and thus they limit the axial temperatures attainable with reasonable power input.An experiment is described in which considerably higher plasma temperatures have been obtained by reducing the coefficient of heat conduction with a superimposed axial magnetic field. At arc currents of about 2 kA and a magnetic field of 10 kG temperatures in the middle of the arc of the order of 10 eV were reached.The measured temperature, pressure and power input of the hydrogen plasma are compared with calculated values. In particular, the coefficient of heat conduction perpendicular to a magnetic field has been determined by measuring the radial temperature profile and the electric field strength. The results agree with theoretical predictions.

Coaxial discharge with axial magnetic field: Demonstration that the Boltzmann relation for electrons generally does not hold in magnetized plasmas

2010 ◽  
Vol 17 (2) ◽  
pp. 022301 ◽  
Author(s):  
T. M. G. Zimmermann ◽  
M. Coppins ◽  
J. E. Allen
Keyword(s):  
Magnetic Field ◽  
Axial Magnetic Field ◽  
Magnetized Plasmas

Combined Effects of Magnetic Field and Thermal Radiation on Fluid Flow and Heat Transfer of Mixed Convection in a Vertical Cylindrical Annulus

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
Ben-Wen Li ◽  
Wei Wang ◽  
Jing-Kui Zhang
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Fluid Flow ◽  
Mixed Convection ◽  
Axial Magnetic Field ◽  
Outer Cylinder ◽  
Mhd Equations ◽  
Temperature Fields ◽  
Flow And Heat Transfer ◽  
Cylindrical Annulus

Magnetohydrodynamic (MHD, also for magnetohydrodynamics) mixed convection of electrically conducting and radiative participating fluid is studied in a differentially heated vertical annulus. The outer cylinder is stationary, and the inner cylinder is rotating at a constant angular speed around its axis. The temperature difference between the two cylindrical walls creates buoyancy force, due to the density variation. A constant axial magnetic field is also imposed to resist the fluid motion. The nonlinear integro-differential equation, which characterizes the radiation transfer, is solved by the discrete ordinates method (DOM). The MHD equations, which describe the magnetic and transport phenomena, are solved by the collocation spectral method (CSM). Detailed numerical results of heat transfer rate, velocity, and temperature fields are presented for 0≤Ha≤100, 0.1≤τL≤10, 0≤ω≤1, and 0.2≤εW≤1. The computational results reveal that the fluid flow and heat transfer are effectively suppressed by the magnetic field as expected. Substantial changes occur in flow patterns as well as in isotherms, when the optical thickness and emissivity of the walls vary in the specified ranges. However, the flow structure and the temperature distribution change slightly when the scattering albedo increases from 0 to 0.5, but a substantial change is observed when it increases to 1.

scholarly journals A numerical simulation for magnetohydrodynamic nanofluid flow and heat transfer in rotating horizontal annulus with thermal radiation

RSC Advances ◽  
2019 ◽  
Vol 9 (39) ◽  
pp. 22185-22197 ◽  
Author(s):  
Yeping Peng ◽  
Ali Sulaiman Alsagri ◽  
Masoud Afrand ◽  
R. Moradi
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Numerical Simulation ◽  
Thermal Radiation ◽  
Axial Magnetic Field ◽  
Nanofluid Flow ◽  
Flow And Heat Transfer ◽  
The Impact

The impact of an axial magnetic field on the heat transfer and nanofluid flow among two horizontal coaxial tubes in the presence of thermal radiation was considered in this study.

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