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Digitale Medien

Theoretical Issues in the Calculation of the Electrical Resistivity of Plasmas (1999)

Perrot, F. ; Dharma-wardana, M. W. C.

Springer

International journal of thermophysics 20 (1999), S. 1299-1311

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ISSN: 1572-9567

Schlagwort(e): aluminum ; average atom model ; plasma conductivity ; resistivity ; Ziman theory

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We recall briefly how the Ziman theory of electrical conductivity, first proposed for solids and liquid metals, has been extended to the case of plasmas. The physical assumptions and parameters entering the formula are analyzed. A self-consistent model of electronic and ionic structure of plasmas is then described and applied to the calculation of the resistivity. Results obtained for aluminum are shown and compared to measurements done by Benage, along a thermo-dynamic path going from normal density at melting to 0.03 compression at 41 eV. The important differences between theory and experiment are discussed. The uncertainties inherent to the theory are emphasized, and physical effects not taken into account in the theory are discussed. Finally, the need for accurate measurements is emphasized.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1022639928248

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Digitale Medien

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

Bonetti, M. ; Perrot, F. ; Beysens, D. ; [weitere]

Springer

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

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ISSN: 1572-9567

Schlagwort(e): CO2 ; critical-point phenomena ; thermal diffusion

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: 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.

Materialart: Digitale Medien

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

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Das Atomgewicht des Chlors (1913)

Baumé, G. ; Louis Perrot, F.

Springer

Fresenius' Zeitschrift für analytische Chemie 52 (1913), S. 335-336

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ISSN: 1618-2650

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01546646

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