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Title: Liquid jet breakup regimes at supercritical pressures

Journal Article · · Combustion and Flame
 [1];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)

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.

Research Organization:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC04-94AL85000; AC04-94-AL85000
OSTI ID:
1236241
Alternate ID(s):
OSTI ID: 1247766
Report Number(s):
SAND-2015-5184J; 594591
Journal Information:
Combustion and Flame, Vol. 162, Issue 10; ISSN 0010-2180
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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Large Eddy Simulation of a Supercritical Fuel Jet in Cross Flow using GPU-Acceleration conference January 2016
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Understanding the breakdown of classic two-phase theory and spray atomization at engine-relevant conditions journal April 2016
A continuous stochastic model for non-equilibrium dense gases journal December 2017
Two-phase developing laminar mixing layer at supercritical pressures journal March 2021
Liquid-jet instability at high pressures with real-fluid interface thermodynamics journal August 2021