Experimental and numerical investigation of phase separation due to multicomponent mixing at high-pressure conditions

C. Traxinger, M. Pfitzner, S. Baab, G. Lamanna, and B. Weigand
Phys. Rev. Fluids 4, 074303 – Published 8 July 2019

Abstract

Experiments and simulations were carried out to contribute to a better understanding and prediction of high-pressure injection into a gaseous environment. Specifically, the focus was put on the phase separation of an initially supercritical fluid due to the interaction with its surrounding. N-hexane was injected into a chamber filled with pure nitrogen at 5 MPa and 293 K. Three different test cases were selected based on a priori calculations applying the adiabatic mixture assumption considering phase separation. The cases selected cover regimes in which real-gas effects and phase separation due to multicomponent mixing are likely to occur. Simultaneous shadowgraphy and elastic light scattering experiments were conducted to capture both the flow structure as well as the phase separation. In addition, large-eddy simulations with a vapor-liquid equilibrium model were performed. Both experimental and numerical results show phase separation for the identical cases. Moreover, qualitative characteristics of the formation process agree well between experiments and numerical simulations. The transition behavior from a dense-gas to a spraylike jet was captured by both.

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  • Received 17 October 2018

DOI:https://doi.org/10.1103/PhysRevFluids.4.074303

©2019 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

C. Traxinger* and M. Pfitzner

  • Institute for Thermodynamics, Bundeswehr University Munich, 85577 Neubiberg, Germany

S. Baab, G. Lamanna, and B. Weigand

  • Institute of Aerospace Thermodynamics, University of Stuttgart, 70569 Stuttgart, Germany

  • *christoph.traxinger@unibw.de

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Vol. 4, Iss. 7 — July 2019

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