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Modeling evaporation of Jet A, JP-7, and RP-1 drops at 1 to 15 bars

Harstad, Kenneth and Bellan, Josette (2004) Modeling evaporation of Jet A, JP-7, and RP-1 drops at 1 to 15 bars. Combustion and Flame, 137 (1-2). pp. 163-177. ISSN 0010-2180. http://resolver.caltech.edu/CaltechAUTHORS:20171019-101642932

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Abstract

A model describing the evaporation of an isolated drop of a multicomponent fuel containing hundreds of species has been developed. The model is based on continuous thermodynamics concepts wherein the composition of a fuel is statistically described using a probability distribution function (PDF). Following previous studies, this PDF is parametrized on the species molar weight. However, unlike in previous studies, a unified formulation is developed wherein the same PDF holds for three major homologous hydrocarbon classes. The new PDF is a double-Gamma-PDF that is parametrized on the square root of the molar weight. The additional advantage of the formulation is that it is valid in the subcritical region from 1 to 15 bars. Discrete species distributions for Jet A, JP-7, and RP-1 are fitted using this novel PDF and extensive calculations for isolated drops of these kerosenes are performed. The results show that under the quasi-steady gas phase assumption, the D^2 law is recovered after an initial transient. The evaporation constant is an increasing function of the far field temperature and pressure and a complex function of far field composition according to the values of the far field temperature and pressure. The difference between the surface and the far field vapor molar fraction is nearly independent of the far field pressure. The composition of the vapor at the drop surface is kerosene-fuel specific. A comparison between results obtained with a model assuming the drop interior to be well mixed and a model wherein the drop may evaporate either in a well-mixed mode or at unchanging composition shows that the percentage difference between the evaporation constant predicted by the two models is within the range of uncertainty in the transport properties.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.combustflame.2004.01.012DOIArticle
http://www.sciencedirect.com/science/article/pii/S0010218004000471?via%3DihubPublisherArticle
Additional Information:© 2004 The Combustion Institute. Published by Elsevier Inc. Received 29 May 2003, Revised 11 January 2004, Accepted 24 January 2004, Available online 5 March 2004. This study was conducted at the California Institute of Technology, Jet Propulsion Laboratory, and was sponsored by the Air Force Research Laboratory, Wright Patterson Air Force Base (WPAFB), through Universal Technology Corporation, with Dr. Tim Edwards of WPAFB as Program Manager.
Funders:
Funding AgencyGrant Number
JPL/CaltechUNSPECIFIED
Air Force Research Laboratory (AFRL)UNSPECIFIED
Universal Technology CorporationUNSPECIFIED
Subject Keywords:Evaporation of multicomponent drops
Record Number:CaltechAUTHORS:20171019-101642932
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20171019-101642932
Official Citation:Kenneth Harstad, Josette Bellan, Modeling evaporation of Jet A, JP-7, and RP-1 drops at 1 to 15 bars, In Combustion and Flame, Volume 137, Issues 1–2, 2004, Pages 163-177, ISSN 0010-2180, https://doi.org/10.1016/j.combustflame.2004.01.012. (http://www.sciencedirect.com/science/article/pii/S0010218004000471)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82486
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Oct 2017 18:05
Last Modified:19 Oct 2017 18:05

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