Publication detail

Experimental Study on Spray Breakup in Turbulent Atomization Using a Spiral Nozzle

KRIŠTOF, O. BULEJKO, P. SVĚRÁK, T.

Original Title

Type

journal article in Web of Science

Language

English

Original Abstract

Spiral nozzles are widely used in wet scrubbers to form an appropriate spray pattern to capture the polluting gas/particulate matterwith the highest possible efficiency. Despite this fact, and a fact that it is a nozzle with a very atypical spray pattern (a full cone consisting of three concentric hollow cones), very limited amount of studies have been done so far on characterization of this type of nozzle. This work reports preliminary results on the spray characteristics of a spiral nozzle used for gas absorption processes. First, we experimentally measured the pressure impact footprint of the spray generated. Then effective spray angles were evaluated from the photographs of the spray and using the pressure impact footprint records via Archimedean spiral equation. Using the classical photography, areas of primary and secondary atomization were determined together with the droplet size distribution, which were further approximated using selected distribution functions. Radial and tangential spray velocity of droplets were assessed using the laser Doppler anemometry. The results show atypical behavior compared to different types of nozzles. In the investigated measurement range, the droplet-size distribution showed higher droplet diameters (about 1 mm) compared to, for example, air assisted atomizers. It was similar for the radial velocity, which was conversely lower (max velocity of about 8 m/s) compared to, for example, effervescent atomizers, which can produce droplets with a velocity of tens to hundreds m/s. On the contrary, spray angle ranged from 58 degrees and 111 degrees for the inner small and large cone, respectively, to 152 degrees for the upper cone, and in the measured range was independent of the inlet pressure of liquid at the nozzle orifice.

Keywords

Spiral nozzle; spray; atomization; droplet size; droplet velocity

Authors

KRIŠTOF, O.; BULEJKO, P.; SVĚRÁK, T.

Released

3. 12. 2019

Publisher

MDPI

Location

Basel, Switzerland

ISBN

2227-9717

Periodical

Processes

Year of study

Number

State

Swiss Confederation

Pages from

Pages to

Pages count

URL

https://www.mdpi.com/2227-9717/7/12/911/htm

Full text in the Digital Library

http://hdl.handle.net/11012/184676

BibTex

@article{BUT160550,
  author="Ondřej {Krištof} and Pavel {Bulejko} and Tomáš {Svěrák}",
  title="Experimental Study on Spray Breakup in Turbulent Atomization Using a Spiral Nozzle",
  journal="Processes",
  year="2019",
  volume="7",
  number="12",
  pages="1--25",
  doi="10.3390/pr7120911",
  issn="2227-9717",
  url="https://www.mdpi.com/2227-9717/7/12/911/htm"
}