Publication detail

Experimental analysis of spatial evolution of mean droplet diameters in effervescent sprays

BROUKAL, J. HÁJEK, J.

Original Title

Experimental analysis of spatial evolution of mean droplet diameters in effervescent sprays

Type

conference paper

Language

English

Original Abstract

Effervescent atomization has established itself in the past decade as a promising alternative to conventional spray formation mechanisms. A great effort is currently being put into understanding the involved phenomena and developing numerical models to predict outcomes of processes relying on effervescent atomizers (i.e. spray combustion, coating, drying). This still proves to be a formidable challenge as effervescent atomization is a complex process involving two phase flow. The presented paper focuses on mean droplet sizes and how they vary throughout effervescent sprays at different operating conditions. The experiment was performed using Phase Doppler Anemometry (PDA) and the droplet data were collected in multiple locations varying both axially and radially. At each measurement location the Sauter Mean Diameter (SMD) was computed. The preliminary results show that closer to the spray nozzle the bigger droplets are concentrated in the spray core, while the small droplets are in the peripheral regions. However, this trend is slowly reversing with increasing distance from the spray nozzle. Finally, from a certain distance the initial trend is completely reversed with the small droplets being in the spray core, while larger droplets are found closer to the edge of the spray. Moreover, this phenomenon seems to be independent of operating conditions. Reasons for such behaviour are suggested and discussed. Furthermore, SMD sensitivity to operating conditions is analysed.

Keywords

Effervescent spray, Phase Doppler Anemometry, atomization

Authors

BROUKAL, J.; HÁJEK, J.

RIV year

2014

Released

27. 8. 2014

Publisher

AIDIC Servizi S.r.l.

Location

Milano

ISBN

978-88-95608-30-3

Book

17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction

ISBN

2283-9216

Periodical

Chemical Engineering Transactions

Year of study

39

State

Republic of Italy

Pages from

780

Pages to

786

Pages count

6

URL

http://www.aidic.it/cet/14/39/131.pdf

BibTex

@inproceedings{BUT109946,
  author="Jakub {Broukal} and Jiří {Hájek}",
  title="Experimental analysis of spatial evolution of mean droplet diameters in effervescent sprays",
  booktitle="17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction",
  year="2014",
  journal="Chemical Engineering Transactions",
  volume="39",
  pages="780--786",
  publisher="AIDIC Servizi S.r.l.",
  address="Milano",
  doi="10.3303/CET1439131",
  isbn="978-88-95608-30-3",
  issn="2283-9216",
  url="http://www.aidic.it/cet/14/39/131.pdf"
}