A Helmholtz energy equation of state with independent variables of temperature and density was developed for sulfur dioxide (SO 2 ) based on thermodynamic property data from the literature. The equation of state is valid from the triple-point temperature of 197.7 to 525 K, with pressures up to 35 MPa and densities up to 25.4 mol·dm −3 . The uncertainties in density of the equation of state are 0.1% in the liquid phase, 0.25% in the vapor phase, and 1% in the critical region. The uncertainty in vapor pressure is 0.2% and the uncertainty in saturated liquid density is 0.2% below 410 K. The uncertainty in isobaric heat capacity is 2% between 200 and 290 K. In the critical region, the uncertainties are higher for all properties except for vapor pressure. The behavior of the equation of state is correct not only within the region of validity, but also at high temperatures and pressures, and far below the triple-point temperature.

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The computational results of two different cases on the evolution of the shock-SF6 heavy bubble interaction are presented. The shock focusing processes and jet formation mechanisms are analyzed by using the high resolution of computation schemes, and the influence of reflected shock waves is also investigated. It is concluded that there are two steps in the shock focusing process behind the incident shock wave, and the density and pressure values increase distinctly when the shock focusing process is completed. The local high pressure and vorticities in the vicinity of the downstream pole can propel the formation of the jet behind the incident shock wave. In addition, the gas is with the rightward velocity before the reflected shock wave impinges on the bubble; therefore, the evolutions of the waves and the bubble are more complicated when the reflected shock wave impinges on the SF6 bubble. Furthermore, the different end wall distances would affect the deformation degree of the bubble before the interaction of the reflected shock wave; therefore, the different left jet formation processes are found after the impingement of reflected shock waves when L = 27 mm. The local high pressure zones in the vicinity of the left bubble interface and the impingement of different shock waves can induce the local gas to shift the rightward velocity to the leftward velocity, which can further promote the formation of jets.