Construction and Validation of a Dense Gas Shock Tube

Fergason, Stephen; Guardone, Alberto; Argrow, Brian

doi:10.2514/2.6789

Cited by 36 publications

(29 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…32 Yet the interpretation of the results presented in Refs. 5 and 32 has been challenged by Cramer, 33 Thompson, 29 Fergason et al 34,35 and the observed wavefield is now believed to be related to both critical point and two-phase nonclassical effects.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Molecular interpretation of nonclassical gas dynamics of dense vapors under the van der Waals model

Colonna

Guardone

2006

Physics of Fluids

View full text Add to dashboard Cite

The van der Waals polytropic gas model is used to investigate the role of attractive and repulsive intermolecular forces and the influence of molecular complexity on the possible nonclassical gas dynamic behavior of vapors near the liquid-vapor saturation curve. The decrease of the sound speed upon isothermal compression is due to the well-known action of the van der Waals attractive forces and this effect is shown here to be comparatively larger for more complex molecules with a large number of active vibrational modes; for these fluids isentropic flows are in fact almost isothermal. Contributions to the speed of sound resulting from intermolecular forces and the role of molecular complexity are analyzed in details for both isothermal and isentropic transformations. Results of the exact solution to the problem of a finite pressure perturbation traveling in a still fluid are presented in three exemplary cases: ideal gas, dense gas and nonclassical gas behavior. A classification scheme of fluids based on the possibility of exhibiting different gas dynamic behaviors is also proposed.

show abstract

Section: Introductionmentioning

confidence: 99%

“…22, 33, and 38-40. Examples are given by the fluids selected for experimental scrutiny of rarefaction shocks in the vapor phase and include hydrocarbons, per-fluorocarbons, 34,35 and more recently siloxanes. 12,39,41 In the cited references it is noted that, by substituting the definition of the speed of sound into ͑3͒, one also has…”

Section: Introductionmentioning

confidence: 99%

Molecular interpretation of nonclassical gas dynamics of dense vapors under the van der Waals model

Colonna

Guardone

2006

Physics of Fluids

View full text Add to dashboard Cite

show abstract

“…Despite the large amount of available theoretical and numerical studies on nonclassical gasdynamics, a limited amount of experimental work has been performed so far, mainly due to the technical difficulties related to the observation of these kind of waves, as discussed by Fergason, Guardone & Argrow (2003) and Colonna et al (2008a). A first attempt at measuring an RSW in Freon-13 (trifluorochloromethane, CCl 3 F) has been carried out in the USSR by Borisov et al (1983).…”

Section: Introductionmentioning

confidence: 99%

Maximum intensity of rarefaction shock waves for dense gases

2009

Self Cite

View full text Add to dashboard Cite

Modern thermodynamic models indicate that fluids consisting of complex molecules may display non-classical gasdynamic phenomena such as rarefaction shock waves (RSWs) in the vapour phase. Since the thermodynamic region in which non-classical phenomena are physically admissible is finite in terms of pressure, density and temperature intervals, the intensity of RSWs is expected to exhibit a maximum for any given fluid. The identification of the operating conditions leading to the RSW with maximum intensity is of paramount importance for the experimental verification of the existence of non-classical phenomena in the vapour phase and for technical applications taking advantage of the peculiarities of the non-classical regime. This study investigates the conditions resulting in an RSW with maximum intensity in terms of pressure jump, wave Mach number and shock strength. The upstream state of the RSW with maximum pressure drop is found to be located along the double-sonic locus formed by the thermodynamic states associated with an RSW having both pre-and post-shock sonic conditions. Correspondingly, the maximumMach thermodynamic and maximum-strength loci locate the pre-shock states from which the RSW with the maximum wave Mach number and shock strength can originate. The qualitative results obtained with the simple van der Waals model are confirmed with the more complex Stryjek-Vera-Peng-Robinson, Martin-Hou and Span-Wagner equations of state for selected siloxane and perfluorocarbon fluids. Among siloxanes, which are arguably the best fluids for experiments aimed at the generation and measurement of an RSW, the state-of-the-art Span-Wagner multiparameter equation of state predicts a maximum wave Mach number close to 1.026 for D 6 (dodecamethylcyclohexasiloxane, [O-Si-(CH 3 ) 2 ] 6 ). Such value is well within the capacity of the measurement system of a newly built experimental set-up aimed at the first-ever demonstration of the existence of RSWs in dense vapours.

show abstract

“…A shock tube experiment aimed at investigating NICFD flows has been pursued in the early 2000s at the University of Colorado at Boulder by Fergason et al (2003). The working fluid was PP10 (perfluorofluorene, C 13 F 22 ), the design operating temperature 360 • C and the design (1) Γ ≡ 1 + ρ c ∂c ∂ρ s , pressure 15.5 bar.…”

Section: Introductionmentioning

confidence: 99%

The flexible asymmetric shock tube (FAST): a Ludwieg tube facility for wave propagation measurements in high-temperature vapours of organic fluids

et al. 2015

View full text Add to dashboard Cite

(2) the process start-up time of the valve has been found to be between 2.1 and 9.0 ms, (3) preliminary rarefaction wave experiments in the dense vapour of siloxane D 6 (dodecamethylcyclohexasiloxane, an organic fluid) were successfully accomplished up to temperatures of 300 • C, and (4) a method for the estimation of the speed of sound from wave propagation experiments is proposed. Results are found to be within 2.1 % of accurate model predictions for various gases. The method is then applied to estimate the speed of sound of D 6 in the NICFD regime. List of symbols cSpeed of sound The set-up is equipped with a special fast-opening valve, separating the high-pressure charge tube from the lowpressure plenum. When the valve is opened, a wave propagates into the charge tube. The wave speed is measured using a time-of-flight technique employing four pressure transducers placed at known distances from each other. The first tests led to the following results: (1) the leakage rate of 5 × 10 −4 mbar l s −1 for subatmospheric and 5 × 10 −2 mbar l s −1 for a superatmospheric pressure is compatible with the purpose of the conceived experiments,

show abstract

Construction and Validation of a Dense Gas Shock Tube

Cited by 36 publications

References 30 publications

Molecular interpretation of nonclassical gas dynamics of dense vapors under the van der Waals model

Molecular interpretation of nonclassical gas dynamics of dense vapors under the van der Waals model

Maximum intensity of rarefaction shock waves for dense gases

The flexible asymmetric shock tube (FAST): a Ludwieg tube facility for wave propagation measurements in high-temperature vapours of organic fluids

Contact Info

Product

Resources

About