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JEDELSKÝ, J. JÍCHA, M.
Original Title
Unsteadiness in Effervescent Sprays, A Comparison of Two Measurement Methods and the Influence of Operation Conditions
Type
conference paper
Language
English
Original Abstract
Two different methods were used to quantify the unsteadiness of effervescent atomizer generated spray in relation to operational conditions, two-phase flow pattern inside the atomizer mixing chamber and position in spray. The first method is based on measurement of pressure fluctuations in atomizer mixing chamber. This novel method was derived and applied here. Results show that decrease in GLR causes the nozzle to become more unsteady. Steady behaviour under dispersed and annular internal flow and tendency to unsteadiness when the flow shifts from frothy to bubbly can be seen on the two-phase flow maps. The second method, developed by Edvard and Marx, uses a comparison of measured interparticle arrival time distribution with theoretical distribution function modelled as inhomogeneous Poisson process. Not fully identical results with those in previous case in relation to the atomizer operation conditions show the spray unsteadiness development after discharge. Spray is more unsteady at its edge as well as at greater downstream distances, which is consistent with other authors findings.
Key words in English
effervescent atomizer, spray quality, spray unsteadiness quantification, measurement method
Authors
JEDELSKÝ, J.; JÍCHA, M.
RIV year
2005
Released
1. 1. 2005
Publisher
International Centre for Heat and Mass Transfer
Location
Ankara, Turkey
ISBN
1-56700-223-4
Book
Proceedings of International Symposium on Heat and Mass Transfer in Spray Systems
Pages from
55
Pages to
57
Pages count
3
BibTex
@inproceedings{BUT16771, author="Jan {Jedelský} and Miroslav {Jícha}", title="Unsteadiness in Effervescent Sprays, A Comparison of Two Measurement Methods and the Influence of Operation Conditions", booktitle="Proceedings of International Symposium on Heat and Mass Transfer in Spray Systems", year="2005", pages="3", publisher="International Centre for Heat and Mass Transfer", address="Ankara, Turkey", isbn="1-56700-223-4" }