Publication detail

Spraying of viscous liquids: influence of the fluids mixing mechanism on the performance of the internal-mixing twin fluid atomizers

MLKVIK, M. JEDELSKÝ, J. KARBSTEIN, H. GAUKEL, V.

Original Title

Spraying of viscous liquids: influence of the fluids mixing mechanism on the performance of the internal-mixing twin fluid atomizers

Type

journal article in Web of Science

Language

English

Original Abstract

The thermal usage of liquid fuels implies their combustion, which is a process strongly influenced by the performance of the atomizer, which disrupts the fuel into drops of the required sizes. The spray quality of the twin-fluid atomizers with internal mixing (IM-TFA) is primarily influenced by the two-phase flow pattern inside the mixing chamber. We studied the performance of the four types of the IM-TFA nozzles by the optical diffraction system (Malvern Spraytec) to answer the question of how the mixing chamber design influences the spray quality at low atomizing gas consumption. We tested the effervescent atomizer in outside-in-liquid (OIL) and outside-in-gas (OIG) configurations, the Y-jet nozzle and new nozzle design, and the CFT atomizer when spraying model liquids with the viscosities comparable to the common fuels (mu=60and143mPa center dot s). We found that the effervescent atomizer performance was strongly influenced by the configuration of the inlet ports. Although the OIL configuration provided the best spray quality (D32= 72 mu m), with the highest efficiency (0.16%), the OIG nozzle was characterized by unstable work and poor spray quality. Both the devices were sensitive to liquid viscosity. The Y-jet nozzle provided a stable performance over the liquid viscosity spectrum, but the spray quality and efficiency were lower than for the OIL nozzle. Our findings can be used to improve the performance of the common IM-TFA types or to design new atomizers. The results also provide an overview of the tested atomizers' performances over the wide range of working conditions and, thus, help to define the application potential of the tested nozzle designs.

Keywords

Twin-fluid atomizer; Two-phase flow; Atomization; Spray imagining; Comparison of atomizers; Spraying efficiency; Droplet size correlations

Authors

MLKVIK, M.; JEDELSKÝ, J.; KARBSTEIN, H.; GAUKEL, V.

Released

30. 7. 2020

Publisher

MDPI

Location

Basel, Switzerland

ISBN

2076-3417

Periodical

Applied Sciences - Basel

Year of study

10

Number

15

State

Swiss Confederation

Pages from

1

Pages to

17

Pages count

17

URL

https://www.mdpi.com/2076-3417/10/15/5249

Full text in the Digital Library

http://hdl.handle.net/11012/195907

BibTex

@article{BUT168014,
  author="Marek {Mlkvik} and Jan {Jedelský} and Heike P. {Karbstein} and Volker {Gaukel}",
  title="Spraying of viscous liquids: influence of the fluids mixing mechanism on the performance of the internal-mixing twin fluid atomizers",
  journal="Applied Sciences - Basel",
  year="2020",
  volume="10",
  number="15",
  pages="1--17",
  doi="10.3390/app10155249",
  issn="2076-3417",
  url="https://www.mdpi.com/2076-3417/10/15/5249"
}