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Evaluation of a locally homogeneous model of spray evaporationMeasurements were conducted on an evaporating spray in a stagnant environment. The spray was formed using an air-atomizing injector to yield a Sauter mean diameter of the order of 30 microns. The region where evaporation occurred extended approximately 1 m from the injector for the test conditions. Profiles of mean velocity, temperature, composition, and drop size distribution, as well as velocity fluctuations and Reynolds stress, were measured. The results are compared with a locally homogeneous two-phase flow model which implies no velocity difference and thermodynamic equilibrium between the phases. The flow was represented by a k-epsilon-g turbulence model employing a clipped Gaussian probability density function for mixture fraction fluctuations. The model provides a good representation of earlier single-phase jet measurements, but generally overestimates the rate of development of the spray. Using the model predictions to represent conditions along the centerline of the spray, drop life-history calculations were conducted which indicate that these discrepancies are due to slip and loss of thermodynamic equilibrium between the phases.
Document ID
19780059660
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Shearer, A. J.
(Pennsylvania State Univ. University Park, PA, United States)
Faeth, G. M.
(Pennsylvania State University University Park, Pa., United States)
Tamura, H.
(Pennsylvania State Univ. University Park, PA, United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1978
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 78-1042
Meeting Information
Meeting: Joint Propulsion Conference
Location: Las Vegas, NV
Country: US
Start Date: July 25, 1978
End Date: July 27, 1978
Sponsors: American Institute of Aeronautics and Astronautics, Society of Automotive Engineers
Accession Number
78A43569
Funding Number(s)
CONTRACT_GRANT: NGR-39-009-077
Distribution Limits
Public
Copyright
Other

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