Low-pressure twin-fluid atomization: Effect of mixing process on spray formation

The present work comparably examines four different twin-fluid atomizers operated under the same operating conditions. Spray formation was examined by several approaches. The internal flow pattern was estimated using a simplified analytical approach, and the results were supported by the observation...

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Bibliographic Details
Published in:International journal of multiphase flow Vol. 89; pp. 277 - 289
Main Authors: Zaremba, Matouš, Weiß, Lukas, Malý, Milan, Wensing, Michael, Jedelský, Jan, Jícha, Miroslav
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.03.2017
Subjects:
Atomization
Back illumination
Droplet dynamics
Liquid breakup
Low-pressure
Twin-fluid
Low-pressure
Droplet dynamics
Back illumination
Liquid breakup
Atomization
Twin-fluid
ISSN:0301-9322, 1879-3533
Online Access:Get full text
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Summary:The present work comparably examines four different twin-fluid atomizers operated under the same operating conditions. Spray formation was examined by several approaches. The internal flow pattern was estimated using a simplified analytical approach, and the results were supported by the observation of the liquid discharge in the near-nozzle region. A high-speed back illumination was used for visualisation of the primary breakup. In the region of fully developed spray, the dynamics of droplets was studied using a phase-Doppler analyser (PDA). The information obtained from all methods was then correlated. Results show that the spray formation process depends mainly on the internal design of twin-fluid atomizer at low gas to liquid ratios (GLR). The amount of gas influences the character of the internal two-phase flow, a mechanism of the liquid breakup, droplet dynamics and a resulting drop size distribution. Differences among the atomizers are reduced with the increase in GLR. Moreover, it was shown that a certain mixing process can inherently create the annular internal flow which generates a stable spray characterized by relatively low mean droplet size.
ISSN:0301-9322
1879-3533
DOI:10.1016/j.ijmultiphaseflow.2016.10.015