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Fast adiabatic heating and temperature relaxation in near-critical fluids under zero gravity (1995)

Bonetti, M. ; Perrot, F. ; Beysens, D. ; [et al.]

Springer

International journal of thermophysics 16 (1995), S. 1059-1067

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ISSN: 1572-9567

Keywords: CO2 ; critical-point phenomena ; thermal diffusion

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Heat transport in supercritical CO2 is studied under microgravity conditions. A large temperature and densityρ region around the critical point is explored (CO2 cells were filled at critical densityρ=ρ c and off-critical densitiesρ=ρ c±0.18ρ c). Local heating is obtained by using a small thermistor located in the bulk fluid. Through interferometric observations, a new mechanism of thermalization has been evidenced. Thermal expansion of a warm diffusing boundary layer around the heating thermistor is responsible for rapid adiabatic heating of the bulk fluid through the emission of pressure waves at the border. The scaled thickness of the thermal boundary layer follows a power law. When the heat flow stops, the bulk adiabatic heating instantaneously vanishes and the temperature relaxation inside the thermal boundary layer follows locally a diffusive process.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02081275

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Current density functional theory in a continuum and lattice lagrangians: Application to spontaneously broken chiral ground states (1992)

Rasolt, Mark ; Vignale, G. ; Perrot, F.

New York, NY : Wiley-Blackwell

International Journal of Quantum Chemistry 44 (1992), S. 359-370

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ISSN: 0020-7608

Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: We formulate the current-density functional theory for systems in arbitrarily strong magnetic fields. A set of self-consistent equations comparable to the Kohn-Sham equations for ordinary density functional theory is derived, and proved to be gauge-invariant and to satisfy the continuity equation. These equations of Vignale and Rasolt involve the gauge field corresponding to the external magnetic field as well as a new gauge field generated entirely from the many-body interactions. We next extend this gauge theory (following Rasolt and Vignale) to a lattice Lagrangian believed to be appropriate to a tight-binding Hamiltonian in the presence of an external magnetic field. We finally examine the nature of the ground state of a strongly nonuniform electron gas in the presence of this many-body, self-induced gauge field. © 1992 John Wiley & Sons, Inc.

Additional Material: 1 Ill.