Publication detail

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

ZAREMBA, M. WEIß, L. MALÝ, M. WENSING, M. JEDELSKÝ, J. JÍCHA, M.

Original Title

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

English Title

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

Type

journal article in Web of Science

Language

en

Original Abstract

The present work comparably examines four different twin-fluid atomizers operated under the same op- erating 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 at- omizer 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.

English abstract

The present work comparably examines four different twin-fluid atomizers operated under the same op- erating 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 at- omizer 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.

Keywords

Low-pressure; Atomization; Twin-fluid; Droplet dynamics; Liquid breakup; Back illumination

Released

01.01.2017

Publisher

Elsevier

Pages from

277

Pages to

289

Pages count

13

URL

Full text in the Digital Library

BibTex


@article{BUT130067,
  author="Matouš {Zaremba} and Lukas {Weiß} and Milan {Malý} and Michael {Wensing} and Jan {Jedelský} and Miroslav {Jícha}",
  title="Low-pressure twin-fluid atomization: Effect of mixing process on spray formation",
  annote="The present work comparably examines four different twin-fluid atomizers operated under the same op- erating 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 at- omizer 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.",
  address="Elsevier",
  chapter="130067",
  doi="10.1016/j.ijmultiphaseflow.2016.10.015",
  howpublished="online",
  institution="Elsevier",
  number="1",
  volume="89",
  year="2017",
  month="january",
  pages="277--289",
  publisher="Elsevier",
  type="journal article in Web of Science"
}