Journal
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
Volume 92, Issue -, Pages 131-139Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmultiphaseflow.2017.03.005
Keywords
Diesel spray; Droplet size; X-ray scattering
Categories
Funding
- DOE Advanced Combustion Program
- Divisions of Chemistry (CHE) and Materials Research (DMR)
- National Science Foundation [NSF/CHE-1346572]
- U.S. DOE [DE-ACO2-06CH11357]
- Fulbright visiting scholar grant
- Ministry of Education, Culture and Sports of Spain [PRX14/00331]
- Spanish MINECO [EEBB-I-15-0976, TRA2012-36932]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1346572] Funding Source: National Science Foundation
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Measurements of droplet size in optically-thick, non-evaporating, shear-driven sprays have been made using ultra-small angle x-ray scattering (USAXS). The sprays are produced by orifice-type nozzles coupled to diesel injectors, with measurements conducted from 1 - 24 mm from the orifice, spanning from the optically-dense near-nozzle region to more dilute regions where optical diagnostics are feasible. The influence of nozzle diameter, liquid injection pressure, and ambient density were examined. The USAXS measurements reveal few if any nanoscale droplets, in conflict with a popular computational model of diesel spray breakup. The average droplet diameter rapidly decreases with downstream distance from the nozzle until a plateau value is reached, after which only small changes are seen in droplet diameter. This plateau droplet size is consistent with the droplets being small enough to be stable with respect to further breakup. Liquid injection pressure and nozzle diameter have the biggest impact on droplet size, while ambient density has a smaller effect. (C) 2017 Published by Elsevier Ltd.
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