Understanding the breakdown of classic two-phase theory and spray atomization at engine-relevant conditions
Abstract
A generalized framework for multi-component liquid injections is presented to understand and predict the breakdown of classic two-phase theory and spray atomization at engine-relevant conditions. The analysis focuses on the thermodynamic structure and the immiscibility state of representative gas-liquid interfaces. The most modern form of Helmholtz energy mixture state equation is utilized which exhibits a unique and physically consistent behavior over the entire two-phase regime of fluid densities. It is combined with generalized models for non-linear gradient theory and for liquid injections to quantify multi-component two-phase interface structures in global thermal equilibrium. Then, the Helmholtz free energy is minimized which determines the interfacial species distribution as a consequence. This minimal free energy state is demonstrated to validate the underlying assumptions of classic two-phase theory and spray atomization. However, under certain engine-relevant conditions for which corroborating experimental data are presented, this requirement for interfacial thermal equilibrium becomes unsustainable. A rigorously derived probability density function quantifies the ability of the interface to develop internal spatial temperature gradients in the presence of significant temperature differences between injected liquid and ambient gas. Then, the interface can no longer be viewed as an isolated system at minimal free energy. Instead, the interfacial dynamics become intimatelymore »
- Authors:
-
- Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1249075
- Alternate Identifier(s):
- OSTI ID: 1303248
- Report Number(s):
- SAND-2016-2790J; SAND2016-7816J
Journal ID: ISSN 1070-6631; PHFLE6; 637597
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Fluids
- Additional Journal Information:
- Journal Volume: 28; Journal Issue: 4; Journal ID: ISSN 1070-6631
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; Multicomponent; Gradient Theory; Supercritical; Spray atomization; Liquid injection
Citation Formats
Dahms, Rainer N. Understanding the breakdown of classic two-phase theory and spray atomization at engine-relevant conditions. United States: N. p., 2016.
Web. doi:10.1063/1.4946000.
Dahms, Rainer N. Understanding the breakdown of classic two-phase theory and spray atomization at engine-relevant conditions. United States. https://doi.org/10.1063/1.4946000
Dahms, Rainer N. Tue .
"Understanding the breakdown of classic two-phase theory and spray atomization at engine-relevant conditions". United States. https://doi.org/10.1063/1.4946000. https://www.osti.gov/servlets/purl/1249075.
@article{osti_1249075,
title = {Understanding the breakdown of classic two-phase theory and spray atomization at engine-relevant conditions},
author = {Dahms, Rainer N.},
abstractNote = {A generalized framework for multi-component liquid injections is presented to understand and predict the breakdown of classic two-phase theory and spray atomization at engine-relevant conditions. The analysis focuses on the thermodynamic structure and the immiscibility state of representative gas-liquid interfaces. The most modern form of Helmholtz energy mixture state equation is utilized which exhibits a unique and physically consistent behavior over the entire two-phase regime of fluid densities. It is combined with generalized models for non-linear gradient theory and for liquid injections to quantify multi-component two-phase interface structures in global thermal equilibrium. Then, the Helmholtz free energy is minimized which determines the interfacial species distribution as a consequence. This minimal free energy state is demonstrated to validate the underlying assumptions of classic two-phase theory and spray atomization. However, under certain engine-relevant conditions for which corroborating experimental data are presented, this requirement for interfacial thermal equilibrium becomes unsustainable. A rigorously derived probability density function quantifies the ability of the interface to develop internal spatial temperature gradients in the presence of significant temperature differences between injected liquid and ambient gas. Then, the interface can no longer be viewed as an isolated system at minimal free energy. Instead, the interfacial dynamics become intimately connected to those of the separated homogeneous phases. Hence, the interface transitions toward a state in local equilibrium whereupon it becomes a dense-fluid mixing layer. A new conceptual view of a transitional liquid injection process emerges from a transition time scale analysis. Close to the nozzle exit, the two-phase interface still remains largely intact and more classic two-phase processes prevail as a consequence. Further downstream, however, the transition to dense-fluid mixing generally occurs before the liquid length is reached. As a result, the significance of the presented modeling expressions is established by a direct comparison to a reduced model, which utilizes widely applied approximations but fundamentally fails to capture the physical complexity discussed in this paper.},
doi = {10.1063/1.4946000},
journal = {Physics of Fluids},
number = 4,
volume = 28,
place = {United States},
year = {Tue Apr 26 00:00:00 EDT 2016},
month = {Tue Apr 26 00:00:00 EDT 2016}
}
Web of Science
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Pollutant formation modelling in natural gas SI engines using a level set based flamelet model
text, January 2008
- Dahms, Rainer Norbert Uwe; Peters, Norbert; Stanton, Donald W.
- RWTH Aachen University
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