Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phrvl..53.1248n&link_type=abstract
Physical Review Letters (ISSN 0031-9007), vol. 53, Sept. 24, 1984, p. 1248-1251. NASA-supported research.
Physics
66
Compression Waves, Gas Giant Planets, Helium Hydrogen Atmospheres, Liquid Helium, Shock Wave Generators, Equations Of State, High Temperature, Interatomic Forces, Light Gas Guns, Potential Energy, Rankine-Hugoniot Relation
Scientific paper
Shock-wave data are presented for liquid helium which has been compressed to densities up to five times greater than the normal liquid. The helium was heated to temperatures up to 21,000 K, while the maximum pressure attained was 56 GPa. The properties of helium and hydrogen are important for modeling the giant planets Saturn and Jupiter where these elements are the major constituents. Conditions on Saturn are of particular interest because studies have suggested that this planet has an internal energy source which is associated with unmixing and gravitational separation of the hydrogen-helium fluid at pressures below 1 TPa. The existence of this phase transition depends very sensitively on the hydrogen and helium equation of state. In the experiments, strong shock waves were generated by the impact of planar projectiles into cryogenic specimen holders.
Governo G. K.
Holmes Norman C.
Mitchell Crichton A.
Nellis William J.
Ross Malcolm
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