Publication detail

Internal two-phase flow and spray characteristics of outside-in-liquid twin-fluid atomizers

HAMMAD, F. SUN, K. CHE, Z. JEDELSKÝ, J. TIANYOU, W.

Original Title

Internal two-phase flow and spray characteristics of outside-in-liquid twin-fluid atomizers

Type

journal article in Web of Science

Language

English

Original Abstract

Despite its wide industrial applications, the internal-mixing twin-fluid atomization suffers a major problem of spray unsteadiness. This work links the flow characteristics inside a newly designed outside-in-liquid (OIL) atomizer with the spray stability and quality by flow visualization and digital image processing. The results show that the inhomogeneous bubbly and slug flow regimes cause an unwanted intermittent flow inside the exit orifice and an unstable coarse spray, while the stable-annular or the wavy-annular chamber flows provide a favorable continuous annular flow inside the exit orifice and a stable fine spray. By proposing a new parameter considering liquid/gas momentum ratio per liquid injection hole, a flow regime map is constructed, and the transition criterion between the favorable annular flow and the unfavorable intermittent flow regimes inside the exit orifice is obtained. A direct relation between the Sauter mean diameter of the spray droplets and the internal flow transition parameter is found. This study indicates that, under specific internal geometries, the optimized OIL atomizer can overcome the spray unsteadiness problem and hence is suitable for applications requiring high spray stability and quality.

Keywords

Twin-fluid atomization, Outside-in-liquid atomizer, Spray unsteadiness, Spray characteristics, Flow regime map

Authors

HAMMAD, F.; SUN, K.; CHE, Z.; JEDELSKÝ, J.; TIANYOU, W.

Released

9. 1. 2021

Publisher

Elsevier Ltd.

Location

The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, UK

ISBN

1359-4311

Periodical

Applied Thermal Engineering

Year of study

187

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

18

Pages count

18

URL

https://www.sciencedirect.com/science/article/pii/S1359431121000120

Full text in the Digital Library

http://hdl.handle.net/11012/195909

BibTex

@article{BUT168043,
  author="Farid A. {Hammad} and Kai {Sun} and Zhizhao {Che} and Jan {Jedelský} and Wang {Tianyou}",
  title="Internal two-phase flow and spray characteristics of outside-in-liquid twin-fluid atomizers",
  journal="Applied Thermal Engineering",
  year="2021",
  volume="187",
  number="1",
  pages="1--18",
  doi="10.1016/j.applthermaleng.2021.116555",
  issn="1359-4311",
  url="https://www.sciencedirect.com/science/article/pii/S1359431121000120"
}