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Title: Liquid jet breakup regimes at supercritical pressures

Previously, a theory has been presented that explains how discrete vapor–liquid interfaces become diminished at certain high-pressure conditions in a manner that leads to well known qualitative trends observed from imaging in a variety of experiments. Rather than surface tension forces, transport processes can dominate over relevant ranges of conditions. In this paper, this framework is now generalized to treat a wide range of fuel-oxidizer combinations in a manner consistent with theories of capillary flows and extended corresponding states theory. Different flow conditions and species-specific molecular properties are shown to produce distinct variations of interfacial structures and local free molecular paths. These variations are shown to occur over the operating ranges in a variety of propulsion and power systems. Despite these variations, the generalized analysis reveals that the envelope of flow conditions at which the transition from classical sprays to diffusion-dominated mixing occurs exhibits a characteristic shape for all liquid–gas combinations. As a result, for alkane-oxidizer mixtures, it explains that these conditions shift to higher pressure flow conditions with increasing carbon number and demonstrates that, instead of widely assumed classical spray atomization, diffusion-dominated mixing may occur under relevant high-pressure conditions in many modern devices.
Authors:
 [1] ;  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Report Number(s):
SAND-2015-5184J
Journal ID: ISSN 0010-2180; 594591
Grant/Contract Number:
AC04-94AL85000; AC04-94-AL85000
Type:
Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 162; Journal Issue: 10; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Research Org:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; supercritical; multiphase; liquid; injection; real-fluid; breakup regimes
OSTI Identifier:
1236241
Alternate Identifier(s):
OSTI ID: 1247766

Oefelein, Joseph C., and Dahms, Rainer Norbert Uwe. Liquid jet breakup regimes at supercritical pressures. United States: N. p., Web. doi:10.1016/j.combustflame.2015.07.004.
Oefelein, Joseph C., & Dahms, Rainer Norbert Uwe. Liquid jet breakup regimes at supercritical pressures. United States. doi:10.1016/j.combustflame.2015.07.004.
Oefelein, Joseph C., and Dahms, Rainer Norbert Uwe. 2015. "Liquid jet breakup regimes at supercritical pressures". United States. doi:10.1016/j.combustflame.2015.07.004. https://www.osti.gov/servlets/purl/1236241.
@article{osti_1236241,
title = {Liquid jet breakup regimes at supercritical pressures},
author = {Oefelein, Joseph C. and Dahms, Rainer Norbert Uwe},
abstractNote = {Previously, a theory has been presented that explains how discrete vapor–liquid interfaces become diminished at certain high-pressure conditions in a manner that leads to well known qualitative trends observed from imaging in a variety of experiments. Rather than surface tension forces, transport processes can dominate over relevant ranges of conditions. In this paper, this framework is now generalized to treat a wide range of fuel-oxidizer combinations in a manner consistent with theories of capillary flows and extended corresponding states theory. Different flow conditions and species-specific molecular properties are shown to produce distinct variations of interfacial structures and local free molecular paths. These variations are shown to occur over the operating ranges in a variety of propulsion and power systems. Despite these variations, the generalized analysis reveals that the envelope of flow conditions at which the transition from classical sprays to diffusion-dominated mixing occurs exhibits a characteristic shape for all liquid–gas combinations. As a result, for alkane-oxidizer mixtures, it explains that these conditions shift to higher pressure flow conditions with increasing carbon number and demonstrates that, instead of widely assumed classical spray atomization, diffusion-dominated mixing may occur under relevant high-pressure conditions in many modern devices.},
doi = {10.1016/j.combustflame.2015.07.004},
journal = {Combustion and Flame},
number = 10,
volume = 162,
place = {United States},
year = {2015},
month = {7}
}