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Investigation of the pressure-volume-temperature equation of state for dense hydrogen-helium mixture using multi-shock compression method

Cai Ling-Cang Gu Yun-Jun Jing Fu-Qian Chen Zhi-Yun Tian Chun-Ling

Investigation of the pressure-volume-temperature equation of state for dense hydrogen-helium mixture using multi-shock compression method

Cai Ling-Cang, Gu Yun-Jun, Jing Fu-Qian, Chen Zhi-Yun, Tian Chun-Ling
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  • The multi-shock Hugoniot and shock temperatures of gaseous hydrogen-helium equimolar mixture with initial pressure and temperature of~30MPa and~90 K have been measured up to 140 GPa using two-stage light gas gun and shock reverberation technique. Two kinds of multi-channel pyrometer systems with different sensitivities, were used in experiment for diagnostics, because the thermal radiation of the sample in the first-shock state is lower than that in the multi-shocked states by a magnitude of one to two orders. The measured pressure, volume and temperature are respectively 5GPa, 12.0cm3/mol and 3030 K in the first-shock state, 27GPa, 6.7cm3/mol and 5070K in the second -shock state, and 105GPa, 4.0cm3/mol and 5090K in the fourth-shock state. The results for the first- and second-shock states are well described by the fluid perturbation theory and dissociation model. It demonstrates that the dissociation of molecular hydrogen of the compressed sample is negligible in the first-shock state, while about 7% and 32% of molecular hydrogen undergo dissociation in the second-and fourth-shock states, respectively. The fourth-shock temperature measured was lower than the prediction for~2000K.
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  • Received Date:  21 November 2006
  • Accepted Date:  21 December 2006
  • Published Online:  20 July 2007

Investigation of the pressure-volume-temperature equation of state for dense hydrogen-helium mixture using multi-shock compression method

  • 1. (1)中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,绵阳 621900; (2)中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,绵阳 621900;西南大学物理系,重庆 400715

Abstract: The multi-shock Hugoniot and shock temperatures of gaseous hydrogen-helium equimolar mixture with initial pressure and temperature of~30MPa and~90 K have been measured up to 140 GPa using two-stage light gas gun and shock reverberation technique. Two kinds of multi-channel pyrometer systems with different sensitivities, were used in experiment for diagnostics, because the thermal radiation of the sample in the first-shock state is lower than that in the multi-shocked states by a magnitude of one to two orders. The measured pressure, volume and temperature are respectively 5GPa, 12.0cm3/mol and 3030 K in the first-shock state, 27GPa, 6.7cm3/mol and 5070K in the second -shock state, and 105GPa, 4.0cm3/mol and 5090K in the fourth-shock state. The results for the first- and second-shock states are well described by the fluid perturbation theory and dissociation model. It demonstrates that the dissociation of molecular hydrogen of the compressed sample is negligible in the first-shock state, while about 7% and 32% of molecular hydrogen undergo dissociation in the second-and fourth-shock states, respectively. The fourth-shock temperature measured was lower than the prediction for~2000K.

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