scholarly journals Effect of magnetic field on thermos: Viscoelastic cylinder subjected to a constant thermal shock

2020 ◽  
Vol 7 (1) ◽  
pp. 117-124
Author(s):  
El Sherif et al. ◽  
Keyword(s):  
Magnetic Field ◽  
Thermal Shock ◽  
Viscoelastic Cylinder

scholarly journals Magneto-thermoelastic waves induced by a thermal shock in a finitely conducting elastic half space

1996 ◽  
Vol 19 (1) ◽  
pp. 131-143 ◽  
Author(s):  
S. K. Roychoudhuri ◽  
Santwana Banerjee (Mukhopadhyay)
Keyword(s):  
Magnetic Field ◽  
Thermal Shock ◽  
Half Space ◽  
Normal Load ◽  
Elastic Half Space ◽  
Thermal Fields ◽  
Sound Effects ◽  
Short Time ◽  
Thermoelastic Waves ◽  
Perturbed Magnetic Field

The propagation of magneto-thermoelastic disturbances produced by a thermal shock in a finitely conducting elastic half-space in contact with vacuum is investigated. The boundary of the half-space is subjected to a normal load. Lord-Shulman theory of thermoelasticity [1] is used to account for the interaction between the elastic and thermal fields. Laplace transform on time is used to obtain the short-time approximations of the solutions because of the short duration of 'second sound' effects. It is found that in the half-space the displacement is continuous at the modified dilational and thermal wavefronts, whereas the perturbed magnetic field, stress and the temperature suffer discontinuities at these locations. The perturbed magnetic field, is, however, discontinuous at the Alf'ven-acoustic wavefront in vacuum.

scholarly journals Liquid-metal targets for high-power applications: Pulsed heating and shock hydrodynamics

2000 ◽  
Vol 18 (4) ◽  
pp. 611-622 ◽  
Author(s):  
AHMED HASSANEIN
Keyword(s):  
Magnetic Field ◽  
Liquid Metal ◽  
Thermal Shock ◽  
Strong Magnetic Field ◽  
High Power ◽  
Isotope Separation ◽  
High Energy ◽  
Liquid Jets ◽  
Muon Collider ◽  
Moving Liquid

Significant interest has recently focused on the use of liquid-metal targets flowing with high velocities for various high-power nuclear and high-energy physics applications such as fusion reactor first-walls, the Spallation Neutron Source, Isotope Separation On Line, and Muon Collider projects. This is because the heat generated in solid targets due to beam or plasma bombardment cannot be removed easily and the resulting thermal shock damage could be a serious lifetime problem for long-term operation. More recently, the use of free or open flying-liquid jets has been proposed for higher-power-density applications. The behavior of a free-moving liquid mercury or gallium jet subjected to proton beam deposition in a strong magnetic field has been modeled and analyzed for the Muon Collider project. Free-liquid-metal jets can offer significant advantages over conventional solid targets, particularly for the more demanding and challenging high-power applications. However, the use of free-moving liquid-metal targets raises a number of new and challenging problems such as instabilities of the jet in a strong magnetic field, induced eddy-current effects on jet shape, thermal-shock formation, and possible jet fragmentation. Problems associated with shock heating of liquid jets in a strong magnetic field are analyzed in this study.

Two-Dimensional Thermal Shock Problem of Generalized Magneto-Thermoelasticity with a Time-Fractional Heat Conduction Law

2016 ◽  
Vol 04 (02) ◽  
pp. 1650004
Author(s):  
M. Bachher ◽  
N. Sarkar
Keyword(s):  
Magnetic Field ◽  
Thermal Shock ◽  
Half Space ◽  
Thermal Stresses ◽  
Dimensional Space ◽  
Normal Mode Analysis ◽  
Mode Analysis ◽  
Plane Boundary ◽  
Two Dimensional ◽  
Field Equations

An electromagneto-thermoelastic coupled problem for a homogeneous, isotropic, thermally and electrically conducting half-space solid whose surface is subjected to a thermal shock is considered in two-dimensional space. The equations of the theory of generalized electromagneto-thermoelasticity with fractional derivative heat transfer allowing the second sound effects are considered. An initial magnetic field acts parallel to the plane boundary of the half-space. The normal mode analysis and the eigenvalue approach techniques are used to solve the resulting nondimensional coupled field equations for the three theories. Numerical results for the temperature, displacements and thermal stresses distributions are presented graphically and discussed. A comparison is made with the results obtained in the presence and absence of the magnetic field.

Magnetic-field strengths from optical polarization data

1967 ◽  
Vol 31 ◽  
pp. 381-383
Author(s):  
J. M. Greenberg
Keyword(s):  
Magnetic Field ◽  
Optical Polarization ◽  
Polarization Data ◽  
Term Model ◽  
Source Of Information ◽  
Field Strengths

Van de Hulst (Paper 64, Table 1) has marked optical polarization as a questionable or marginal source of information concerning magnetic field strengths. Rather than arguing about this–I should rate this method asq+-, or quarrelling about the term ‘model-sensitive results’, I wish to stress the historical point that as recently as two years ago there were still some who questioned that optical polarization was definitely due to magnetically-oriented interstellar particles.

Observing the galactic magnetic field

1967 ◽  
Vol 31 ◽  
pp. 375-380
Author(s):  
H. C. van de Hulst
Keyword(s):  
Magnetic Field ◽  
Fair Agreement ◽  
Solar Neighbourhood ◽  
Galactic Magnetic Field ◽  
The Magnetic Field

Various methods of observing the galactic magnetic field are reviewed, and their results summarized. There is fair agreement about the direction of the magnetic field in the solar neighbourhood:l= 50° to 80°; the strength of the field in the disk is of the order of 10-5gauss.

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