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Structure of nonevaporating sprays - Measurements and predictionsStructure measurements were completed within the dilute portion of axisymmetric nonevaporating sprays (SMD of 30 and 87 microns) injected into a still air environment, including: mean and fluctuating gas velocities and Reynolds stress using laser-Doppler anemometry; mean liquid fluxes using isokinetic sampling; drop sizes using slide impaction; and drop sizes and velocities using multiflash photography. The new measurements were used to evaluate three representative models of sprays: (1) a locally homogeneous flow (LHF) model, where slip between the phases was neglected; (2) a deterministic separated flow (DSF) model, where slip was considered but effects of drop interaction with turbulent fluctuations were ignored; and (3) a stochastic separated flow (SSF) model, where effects of both interphase slip and turbulent fluctuations were considered using random sampling for turbulence properties in conjunction with random-walk computations for drop motion. The LHF and DSF models were unsatisfactory for present test conditions-both underestimating flow widths and the rate of spread of drops. In contrast, the SSF model provided reasonably accurate predictions, including effects of enhanced spreading rates of sprays due to drop dispersion by turbulence, with all empirical parameters fixed from earlier work.
Document ID
19840035110
Document Type
Conference Paper
Authors
Solomon, A. S. P. (Pennsylvania State Univ. University Park, PA, United States)
Shuen, J.-S. (Pennsylvania State Univ. University Park, PA, United States)
Zhang, Q.-F. (Pennsylvania State University University Park, PA, United States)
Faeth, G. M. (Pennsylvania State Univ. University Park, PA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Report/Patent Number
AIAA PAPER 84-0125
Funding Number(s)
CONTRACT_GRANT: NAG3-190
Distribution Limits
Public
Copyright
Other