Dalton's and Amagat's laws fail in gas mixtures with shock propagation
| Autor: | Dylan Simons, Gregory Vigil, Peter Vorobieff, Ignacio Trueba-Monje, C. R. Truman, Sean P. Cooper, Patrick Wayne, V. Vorob’ev, Daniel Freelong, T. Clark |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Work (thermodynamics) Multidisciplinary Real gas chemistry.chemical_element SciAdv r-articles 02 engineering and technology Perfect gas Amagat 01 natural sciences 010305 fluids & plasmas Shock (mechanics) Sulfur hexafluoride chemistry.chemical_compound 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Law 0103 physical sciences Dalton's law Helium Astrophysics::Galaxy Astrophysics Research Articles Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | We present an experimental study of a fundamental case where gas mixture models fail: shock propagation through a gas mixture. A shock propagating through a gas mixture leads to pressure, temperature, and density increases across the shock front. Rankine-Hugoniot relations correlating pre- and post-shock quantities describe a calorically perfect gas but deliver a good approximation for real gases, provided the pre-shock conditions are well characterized with a thermodynamic mixing model. Two classic thermodynamic models of gas mixtures are Dalton’s law of partial pressures and Amagat’s law of partial volumes. We measure post-shock temperature and pressure in experiments with nonreacting binary mixtures of sulfur hexafluoride and helium (two dramatically disparate gases) and show that neither model can accurately predict the observed values, on time scales much longer than that of the shock front passage, due to the models’ implicit assumptions about mixture behavior on the molecular level. However, kinetic molecular theory can help account for the discrepancy. Our results provide starting points for future theoretical work, experiments, and code validation. |
| Databáze: | OpenAIRE |
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