Published May 1988 | Version v1
Report Open

Benefits of microgravity for measurement of thermo-transport coefficients in liquid metal alloys

Creators

Description

After giving a brief review of thermo-transport principles, this paper describes the experimental technique used and presents the results obtained on the ground. The author determines the solutal stability conditions to be satisfied by the metal alloy so that ground thermotransport measurements are not disturbed by convection effects. The benefits of microgravity when such conditions cannot be achieved are demonstrated and the results obtained on pure Sn (isotope separation), Sn-Co, Sn-Ag and Sn-Bi during Spacelab missions in 1983 and 1985 are presented. The results of experiments carried out without the disturbing effect of convection are compared with those found in literature (experiments or calculations carried out from liquid structure models)

Abstract (French)

Apres un rappel sur la thermodiffusion, on decrit la technique experimentale utilisee et on presente les resultats obtenus au sol. On determine les conditions de stabilite solutale auxquelles un alliage metallique doit satisfaire pour que les mesures de thermodiffusion au sol ne soient pas perturbees par la convection. On montre l'interet de la microgravite lorsque ces conditions ne peuvent etre remplies et on presente les resultats obtenus lors des missions SPACELAB de 1983 et 1985 pour Sn pur (separation isotopique), Sn-Co, Sn-Ag et Sn-Bi. Les resultats des experiences non perturbees par la convection sont compares a ceux de la litterature (experiences ou calculs effectues a partir de modeles sur la structure des liquides

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Additional details

Additional titles

Original title (French)
Interet de la microgravite pour la mesure des coefficients de thermo-diffusion dans les alliages metalliques liquides

Publishing Information

Imprint Pagination
50 p.
Report number
CEA-R--5449

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
19094981
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
CONVECTION; ISOTOPE SEPARATION; LIQUID METALS; THERMAL DIFFUSION; TIN BASE ALLOYS; TIN 112
Descriptors DEC
ALLOYS; DIFFUSION; ELEMENTS; ENERGY TRANSFER; EVEN-EVEN NUCLEI; FLUIDS; HEAT TRANSFER; INTERMEDIATE MASS NUCLEI; ISOTOPES; LIQUIDS; METALS; NUCLEI; SEPARATION PROCESSES; STABLE ISOTOPES; TIN ALLOYS; TIN ISOTOPES