Publication detail

Discharge coefficient and operational flow characteristics of multihole effervescent atomizer.

JEDELSKÝ, J. JÍCHA, M. SLÁMA, J.

Original Title

Discharge coefficient and operational flow characteristics of multihole effervescent atomizer.

English Title

Discharge coefficient and operational flow characteristics of multihole effervescent atomizer.

Type

conference paper

Language

en

Original Abstract

The study of effervescent atomizers is being conducted with the aim to develop an effervescent atomizer for industrial burners that will generate a fine and stable spray in a large turn-down ratio, and provide a symmetrical flux distribution. The atomizer is powered with light heating oil and uses air as an atomizing medium. The atomizer is expected to replace Y-jet atomizer frequently used in burners. This research is a follow up of a research done previously with a single-hole effervescent atomizers with various geometrical features of both, the aerator and the body of the atomizer. Based on results of this study, a multi-hole effervescent atomizer was designed in several geometrical modifications. Except size spectrum and flux distribution of the spray, other flow characteristics of the atomizers are very important from the point of the operation of the atomizers. Among them, flow rates of both mediums as function of pressure of both and GLR (Gas-to-Liquid Ratio) are most important from the point to adjust the system for predetermined turn-down ratio. Other important parameter is discharge coefficient. Three basic variants of multihole effervescent atomizers have been studied that differ in the geometry. One of the basic requirements in designing the nozzles was to prevent neighboring sprays generated by individual holes from possible merging. This could lead to coalescence of droplets due to low droplets velocities in the outer spray region and consecutively to an increase of SMD. It could also prevent combustion air from better mixing with fuel. Attention was also given to an easy control of atomizer operation in a real application in burners, i.e. to ensure a possibility to operate the atomizer with a well determined pressure difference between fuel and air. Paper suggests some recommendations for designers of effervescent atomizers.

English abstract

The study of effervescent atomizers is being conducted with the aim to develop an effervescent atomizer for industrial burners that will generate a fine and stable spray in a large turn-down ratio, and provide a symmetrical flux distribution. The atomizer is powered with light heating oil and uses air as an atomizing medium. The atomizer is expected to replace Y-jet atomizer frequently used in burners. This research is a follow up of a research done previously with a single-hole effervescent atomizers with various geometrical features of both, the aerator and the body of the atomizer. Based on results of this study, a multi-hole effervescent atomizer was designed in several geometrical modifications. Except size spectrum and flux distribution of the spray, other flow characteristics of the atomizers are very important from the point of the operation of the atomizers. Among them, flow rates of both mediums as function of pressure of both and GLR (Gas-to-Liquid Ratio) are most important from the point to adjust the system for predetermined turn-down ratio. Other important parameter is discharge coefficient. Three basic variants of multihole effervescent atomizers have been studied that differ in the geometry. One of the basic requirements in designing the nozzles was to prevent neighboring sprays generated by individual holes from possible merging. This could lead to coalescence of droplets due to low droplets velocities in the outer spray region and consecutively to an increase of SMD. It could also prevent combustion air from better mixing with fuel. Attention was also given to an easy control of atomizer operation in a real application in burners, i.e. to ensure a possibility to operate the atomizer with a well determined pressure difference between fuel and air. Paper suggests some recommendations for designers of effervescent atomizers.

Keywords

Discharge coefficient, operational flow characteristics, multihole effervescent atomizer

RIV year

2003

Released

13.07.2003

Publisher

Illas Europe

Location

Sorrento, Italy

ISBN

88-88104-03-8

Book

9th International Conference on Liquid Atomization and Spray Systems - ICLASS 2003

Pages from

0310

Pages to

310

Pages count

1

BibTex


@inproceedings{BUT7836,
  author="Jan {Jedelský} and Miroslav {Jícha} and Jaroslav {Sláma}",
  title="Discharge coefficient and operational flow characteristics of multihole effervescent atomizer.",
  annote="The study of effervescent atomizers is being conducted with the aim to develop an effervescent atomizer for industrial burners that will generate a fine and stable spray in a large turn-down ratio, and provide a symmetrical flux distribution. The atomizer is powered with light heating oil and uses air as an atomizing medium. The atomizer is expected to replace Y-jet atomizer frequently used in burners. This research is a follow up of a research done previously with a single-hole effervescent atomizers with various geometrical features of both, the aerator and the body of the atomizer. Based on results of this study, a multi-hole effervescent atomizer was designed in several geometrical modifications. Except size spectrum and flux distribution of the spray, other flow characteristics of the atomizers are very important from the point of the operation of the atomizers. Among them, flow rates of both mediums as function of pressure of both and GLR (Gas-to-Liquid Ratio) are most important from the point to adjust the system for predetermined turn-down ratio. Other important parameter is discharge coefficient. Three basic variants of multihole effervescent atomizers have been studied that differ in the geometry. One of the basic requirements in designing the nozzles was to prevent neighboring sprays generated by individual holes from possible merging. This could lead to coalescence of droplets due to low droplets velocities in the outer spray region and consecutively to an increase of SMD. It could also prevent combustion air from better mixing with fuel. Attention was also given to an easy control of atomizer operation in a real application in burners, i.e. to ensure a possibility to operate the atomizer with a well determined pressure difference between fuel and air. Paper suggests some recommendations for designers of effervescent atomizers.",
  address="Illas Europe",
  booktitle="9th International Conference on Liquid Atomization and Spray Systems - ICLASS 2003",
  chapter="7836",
  institution="Illas Europe",
  year="2003",
  month="july",
  pages="0310",
  publisher="Illas Europe",
  type="conference paper"
}