Comparative measurement of the breakup length of liquid jets in airblast atomisers using optical connectivity, electrical connectivity and shadowgraphy
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Supporting information
Published version
Author(s)
Charalampous, G
Hadjiyiannis, C
Hardalupas, Y
Type
Journal Article
Abstract
A comparative examination of the optical connectivity, electrical connectivity and shadowgraphy
techniques for the measurement of the break-up length of atomising liquid jets from a co-axial airblast
atomiser is presented. The atomiser was operated over air-to-liquid Momentum Ratios between 27 and
335 and Momentum Flux Ratios between 0.67 and 8.27. Shadowgraphy records instantaneous images
of the shadow of the atomising liquid jet when it is back-illuminated by a light source. The electrical
connectivity uses the continuity of an electrically conducting atomising liquid jet to measure the
potential during the presence of an electrical connection between the spray nozzle and a probe further
downstream. The optical connectivity visualises the atomising liquid jet, doped with a fluorescing dye,
as it is illuminated from within the nozzle using a laser beam. Comparison of the measured breakup
lengths with time resolved shadowgraphy, optical connectivity and electrical connectivity, following
the proposed novel processing of the time-dependent potential, showed that the mean values are all
within ±15% of each other. The advantages and limitations of each technique are discussed.
techniques for the measurement of the break-up length of atomising liquid jets from a co-axial airblast
atomiser is presented. The atomiser was operated over air-to-liquid Momentum Ratios between 27 and
335 and Momentum Flux Ratios between 0.67 and 8.27. Shadowgraphy records instantaneous images
of the shadow of the atomising liquid jet when it is back-illuminated by a light source. The electrical
connectivity uses the continuity of an electrically conducting atomising liquid jet to measure the
potential during the presence of an electrical connection between the spray nozzle and a probe further
downstream. The optical connectivity visualises the atomising liquid jet, doped with a fluorescing dye,
as it is illuminated from within the nozzle using a laser beam. Comparison of the measured breakup
lengths with time resolved shadowgraphy, optical connectivity and electrical connectivity, following
the proposed novel processing of the time-dependent potential, showed that the mean values are all
within ±15% of each other. The advantages and limitations of each technique are discussed.
Date Issued
2016-04-07
Date Acceptance
2016-03-26
Citation
Measurement, 2016, 89, pp.288-299
ISSN
1873-412X
Publisher
Elsevier
Start Page
288
End Page
299
Journal / Book Title
Measurement
Volume
89
Copyright Statement
© 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://
creativecommons.org/licenses/by/4.0/).
creativecommons.org/licenses/by/4.0/).
Sponsor
European Office Of Aerospace Research & Developmen
Engineering & Physical Science Research Council (EPSRC)
Grant Number
FA8655-09-1-3036
EP/G01597X/1
Subjects
Electrical & Electronic Engineering
0102 Applied Mathematics
0913 Mechanical Engineering
Publication Status
Published