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Title: Multicomponent fuel vaporization at high pressures.

Abstract

We extend our multicomponent fuel model to high pressures using a Peng-Robinson equation of state, and implement the model into KIVA-3V. Phase equilibrium is achieved by equating liquid and vapor fugacities. The latent heat of vaporization and fuel enthalpies are also corrected for at high pressures. Numerical simulations of multicomponent evaporation are performed for single droplets for a diesel fuel surrogate at different pressures.

Authors:
 [1];  [2]
  1. (David J.)
  2. (Peter J.)
Publication Date:
Research Org.:
Los Alamos National Laboratory
Sponsoring Org.:
USDOE
OSTI Identifier:
975959
Report Number(s):
LA-UR-02-0308; LA-UR-02-308
TRN: US201018%%1044
Resource Type:
Conference
Resource Relation:
Conference: Submitted to: International Multidimensional Engine Modeling User's Group Meeting at the SAE Congress, March 3, 2002
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; DIESEL FUELS; ENGINES; EVAPORATION; SIMULATION; VAPORIZATION HEAT

Citation Formats

Torres, D. J., and O'Rourke, P. J. Multicomponent fuel vaporization at high pressures.. United States: N. p., 2002. Web.
Torres, D. J., & O'Rourke, P. J. Multicomponent fuel vaporization at high pressures.. United States.
Torres, D. J., and O'Rourke, P. J. Tue . "Multicomponent fuel vaporization at high pressures.". United States. doi:. https://www.osti.gov/servlets/purl/975959.
@article{osti_975959,
title = {Multicomponent fuel vaporization at high pressures.},
author = {Torres, D. J. and O'Rourke, P. J.},
abstractNote = {We extend our multicomponent fuel model to high pressures using a Peng-Robinson equation of state, and implement the model into KIVA-3V. Phase equilibrium is achieved by equating liquid and vapor fugacities. The latent heat of vaporization and fuel enthalpies are also corrected for at high pressures. Numerical simulations of multicomponent evaporation are performed for single droplets for a diesel fuel surrogate at different pressures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2002},
month = {Tue Jan 01 00:00:00 EST 2002}
}

Conference:
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  • An analysis of multicomponent fuel droplet vaporization under elevated pressures and temperatures is made, with particular emphasis on the liquid phase transfer and high pressure phenomena. A mathematical model is proposed, which consists of a gas phase with variable properties, liquid phase with an effective diffusivity and phase equilibrium at the gas-liquid boundary. Some calculation results are given for pentane-octane mixtures. It is shown that differences between the relative evaporation rates of different species are smaller when ambient pressure is increased. It is also shown that the potential for this particular miscible multicomponent droplet to undergo micro-explosions decreases as themore » pressure increases.« less
  • The evaporation of a multicomponent droplet in a convective field is analyzed at sufficiently high Reynolds number so that internal circulation is fast with respect to diffusion. The theory is an extension of a previous single component analysis to the case of any number of miscible components. The solution of the equations are shown for several two-component cases. It is found that the transient behavior prevails for both heat and mass transfer under the conditions analyzed. Even though circulation time is fast, gradients of both temperature and mass are significant, in discrepancy with the usual assumptions in this so-called ''rapidmore » mixing'' limit. The more volatile component evaporates first from the surface, yet remains inside the core; the temperature history is then controlled by the heavy component, exceeding after some time the boiling point of the light component. This work is pertinent to synthetic fuels. 10 refs.« less
  • The multicomponent analog of the classical single-component d/sup 2/-Law for droplet vaporization and combustion has been formulated based on the concept that the extremely slow rate of liquid phase mass diffusion causes the droplet concentration distributions to attain almost constant values during much of the droplet lifetime. Explicit formulas are presented allowing direct evaluation of all properties of interest. Experimental results obtained for an alcohol-alkane binary droplet confirm the d/sup 2/-Law behavior and the compositional dependence of the burning rate constant. The characteristics of internal bubbling leading to disruptive combustion are also discussed. 14 refs.
  • This paper reviews recent advances in droplet vaporization and combustion in three areas; namely (1) the gasification mechanisms of multicomponent droplets, in which the authors show that while liquid-phase diffusional resistance is very strong for the immiscible emulsion systems, it is only moderately effective for miscible mixtures such that their gasification mechanism is intermediate of those of batch distillation and diffusion-limited steady state; (2) the role of water and alcohol addition in the soot formation from droplet burning, in which the authors show dilution and thermal effects are primarily responsible for the observed soot reduction while the presence of themore » hydroxyl group has no effect; and (3) the gasification of droplets or organic azides, in which the authors show that they have extremely rapid gasification rates as well as a greater propensity to micro-explode due to the occurrence of liquid-phase reaction.« less