Soundspeed measurements in vapor-liquid mixtures behind shock waves

Chen, G.; Thompson, P. A.; Bursik, J. W.

doi:10.1007/bf00369120

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…superheated vapour, metastable vapour, and vapour-liquid mixture, are visible at the corners. Chen, Thompson & Bursik (1986) measured the sound speed of the two-phase liquid-vapour mixture behind the liquefaction shock wave using a simple Mach construction. Comparison with theoretical equilibrium (zero frequency) sound speeds indicated that departures from the equilibrium values increased with increasing shock strength.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of reflected liquefaction shock waves with near-critical downstream states in a test fluid of large molar heat capacity

1994

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Near-critical states have been achieved downstream of a liquefaction shock wave, which is a shock reflected from the endwall of a shock tube. Photographs of the shocked test fluid (iso-octane) reveal a rich variety of phase-change phenomena. In addition to the existence of two-phase toroidal rings which have been previously reported, two-phase structures with a striking resemblance to dandelions and orange slices have been frequently observed. A model coupling the flow and nucleation dynamics is introduced to study the two-wave system of shock-induced condensation and the liquefaction shock wave in fluids of large molar heat capacity. In analogy to the one-dimensional Zeldovich–von Neumann–Döring (ZND) model of detonation waves, the leading part of the liquefaction shock wave is a gasdynamic pressure discontinuity (Δ ≈ 0.1 μm, τ ≈ 1 ns) which supersaturates the test fluid, and the phase transition takes place in the condensation relaxation zone (Δ ≈ 1–103 μm, τ ≈ 0.1–100 μs) via dropwise condensation. At weak to moderate shock strengths, the average lifetime of the metastable state, τ ∞ 1/J, is long such that the reaction zone is spatially decoupled from the forerunner shock wave, and J is the homogeneous nucleation rate. With increasing shock strength, a transition in the phase-change mechanism from nucleation and growth to spinodal decomposition is anticipated based on statistical mechanical arguments. In particular, within a complete liquefaction shock the metastable region is entirely bypassed, and the vapour decomposes inside the unstable region. This mechanism of unmixing in which nucleation and growth become one continuous process provides a consistent framework within which the observed irregularities can be explained.

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Section: Introductionmentioning

confidence: 99%

An experimental study of reflected liquefaction shock waves with near-critical downstream states in a test fluid of large molar heat capacity

1994

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“…This problem has received considerable attention both experimentally and theoretically in the field of two phase flow. Measurements have been presented by several investigators for the propagation speed of pressure and/or rarefaction waves in wet steam flow [1][2][3] or in vapour-liquid mixtures [4]. Few theoretical researches can be found in the literature concern with predicting the acoustic velocity variation in two phase or wet steam flows.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Acoustic Velocity in a Nonequilibrium Wet Steam Flow

Mahmoud

1991

International Conference on Aerospace Sciences and Aviation Tec

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The acoustic velocity in a nonequilibrium wet steam flow has been investigated theoretically. Modified equations of unsteady onedimensional wet steam flow are taken to describe the propagation of a plane pressure wave of very small amplitude through the wet steam flow. These equations are derived for the conditions of nucleating and non-nucleating wet steam assuming that the vapour phase obeys the perfect gas law and the water and vapour phases are in disequilibrium both thermally and dynamically. The acoustic velocity is shown to depend mainly on the steam wetness, flow nonequilibrium characteristics (i.e., vapour supercooling and slip ratio) and flow pressure; while it slightly affected by the size of droplets and nucleation occurrence.

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Liquefaction Shock Waves

Meier¹

2007

Shock Wave Science and Technology Reference Library

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Soundspeed measurements in vapor-liquid mixtures behind shock waves

Cited by 5 publications

References 8 publications

An experimental study of reflected liquefaction shock waves with near-critical downstream states in a test fluid of large molar heat capacity

An experimental study of reflected liquefaction shock waves with near-critical downstream states in a test fluid of large molar heat capacity

Investigation of the Acoustic Velocity in a Nonequilibrium Wet Steam Flow

Liquefaction Shock Waves

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