We report a study of the variation and compensation of gravitational forces in diphasic (p‐) hydrogen. The sample is placed on the axis of a superconducting coil near one of the ends, in order to benefit from a nearly uniform magnetic field gradient. A variable reduced effective gravity can thus be applied to the fluid. It is shown that the exact compensation of gravitational forces (“weightlessness conditions”) is limited by the inhomogeneity of the magnetic field gradient, which consists of a radial force field centered on the point of compensation and varying proportionally with the distance from this point. Such inhomogeneities can be quantified by an associated capillary length The effect of this remaining field is negligible when is smaller than the cell dimension. Near the critical point, the length tends to zero and the gas-liquid interface is deformed in a paradoxical pattern, in which the liquid phase lies at the center of the container with the gas phase at the walls. We vary the effective gravity and determine in a wide range of reduced temperature the corresponding capillary length from a fit of the interface profile. The data complement previous measurements in at performed further from
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19 January 2000
SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM - 2000
30 Jan - 3 Feb 2000
Albuquerque, New Mexico (USA)
Research Article|
January 19 2000
Magnetic compensation of gravitational forces in (p‐) hydrogen near its critical point: Application to weightlessness conditions
Daniel Beysens;
Daniel Beysens
1Service des Basses Températures, DRFMC, CEA Grenoble, 17, rue des Martyrs, 38504 Grenoble cedex 09, France
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Régis Wunenburger;
Régis Wunenburger
2Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 Centre National de la Recherche Scientifique, avenue Dr. A. Schweitzer, 33608 Pessac cedex, France
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Denis Chatain;
Denis Chatain
1Service des Basses Températures, DRFMC, CEA Grenoble, 17, rue des Martyrs, 38504 Grenoble cedex 09, France
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Yves Garrabos
Yves Garrabos
2Institut de Chimie de la Matière Condensée de Bordeaux, UPR 9048 Centre National de la Recherche Scientifique, avenue Dr. A. Schweitzer, 33608 Pessac cedex, France
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AIP Conf. Proc. 504, 902–910 (2000)
Citation
Daniel Beysens, Régis Wunenburger, Denis Chatain, Yves Garrabos; Magnetic compensation of gravitational forces in (p‐) hydrogen near its critical point: Application to weightlessness conditions. AIP Conf. Proc. 19 January 2000; 504 (1): 902–910. https://doi.org/10.1063/1.1302593
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