Detail publikace

Účinnost tlakové a effervescent atomizace

OTÁHAL, J. JEDELSKÝ, J. FIŠER, J. JÍCHA, M.

Originální název

Efficiency of the pressure and effervescent atomization

Český název

Účinnost tlakové a effervescent atomizace

Anglický název

Efficiency of the pressure and effervescent atomization

Typ

článek ve sborníku

Jazyk

en

Originální abstrakt

The article deals with a description of the processes in the field of atomization by means of two different types of atomizers. The pressure atomizers are the most used in the industry. The term effervescent atomizer designates a two-phase nozzle with the inside mixing of two fluids. This type of nozzles is used as a substitute to the Y-jet atomizers as employed in burners. The comparison between efficiency of the pressure and the effervescent atomization may help decide which type of the atomizer is suitable for particular application. An evaluation of both of the types of atomization principles is based on experiments. With using PDA (Phase Doppler Analyzer) system, it is possible to acquire precise information about the spray quality in particular measurement points within the spray cone. The experiments were carried out on a model of an effervescent atomizer and three small pressure atomizers. Results from PDA measurement show that the spray cone and SMD (Sauter Mean Diameter) distributions are almost symmetrical, thus the measurements were carried out over one plane located at the nozzle axis in the distance of 150 mm from the discharge orifice. During the experiment, the effervescent nozzle was operated at different air pressure levels ranging from 0.1 to 0.5 MPa and mass GLR (Gas-to-liquid- ratio) from 0.1 to 25%. The liquid employed was water. Mass flow rates of water ranged from 5 up to 100 g.s-1. The nozzle was designed as an inside-out gas injection configuration. The inner diameter of the mixing chamber was 8 mm. Three small pressure nozzles were tested at the maximal pressure level of 0.5 MPa and flow rates covered the same range, as it was the case with the effervescent nozzle. Size and velocity distributions in the spray cone acquired are difficult to compare therefore integral values of mean diameters are needed. The spray quality was represented by a single integral value of a mean diameter. The comparison of these values, as obtained for two different spray patterns, provides information about the spray quality. SMD (Sauter Mean Diameter), D20 and D30 values from PDA measurement are necessary to define the integral values of SMD and D20. These two characteristics of the spray and flow rate characteristics (pressure level, flow rate) are essential when assessing the atomization efficiency. Generally, the single-phase atomizers reach higher efficiency then the two-phase nozzle. On the other hand, the twin-fluids nozzles produce spray with high quality in the large turndown ratio in the same pressure level range.

Český abstrakt

Článek se zabývá srovnáním dvou typů atomizace kapalin a vyhodnocením účinnosti těchto atomizačních principů.

Anglický abstrakt

The article deals with a description of the processes in the field of atomization by means of two different types of atomizers. The pressure atomizers are the most used in the industry. The term effervescent atomizer designates a two-phase nozzle with the inside mixing of two fluids. This type of nozzles is used as a substitute to the Y-jet atomizers as employed in burners. The comparison between efficiency of the pressure and the effervescent atomization may help decide which type of the atomizer is suitable for particular application. An evaluation of both of the types of atomization principles is based on experiments. With using PDA (Phase Doppler Analyzer) system, it is possible to acquire precise information about the spray quality in particular measurement points within the spray cone. The experiments were carried out on a model of an effervescent atomizer and three small pressure atomizers. Results from PDA measurement show that the spray cone and SMD (Sauter Mean Diameter) distributions are almost symmetrical, thus the measurements were carried out over one plane located at the nozzle axis in the distance of 150 mm from the discharge orifice. During the experiment, the effervescent nozzle was operated at different air pressure levels ranging from 0.1 to 0.5 MPa and mass GLR (Gas-to-liquid- ratio) from 0.1 to 25%. The liquid employed was water. Mass flow rates of water ranged from 5 up to 100 g.s-1. The nozzle was designed as an inside-out gas injection configuration. The inner diameter of the mixing chamber was 8 mm. Three small pressure nozzles were tested at the maximal pressure level of 0.5 MPa and flow rates covered the same range, as it was the case with the effervescent nozzle. Size and velocity distributions in the spray cone acquired are difficult to compare therefore integral values of mean diameters are needed. The spray quality was represented by a single integral value of a mean diameter. The comparison of these values, as obtained for two different spray patterns, provides information about the spray quality. SMD (Sauter Mean Diameter), D20 and D30 values from PDA measurement are necessary to define the integral values of SMD and D20. These two characteristics of the spray and flow rate characteristics (pressure level, flow rate) are essential when assessing the atomization efficiency. Generally, the single-phase atomizers reach higher efficiency then the two-phase nozzle. On the other hand, the twin-fluids nozzles produce spray with high quality in the large turndown ratio in the same pressure level range.

Klíčová slova

effervescent a tlakova atomizace, ucinnost atomizace, velikostne-rychlostni rozlozeni kapek ve spreji

Rok RIV

2007

Vydáno

10.09.2007

Nakladatel

Mugla University

Místo

Mugla, Turecko

Strany od

76

Strany do

79

Strany počet

400

BibTex


@inproceedings{BUT23720,
  author="Jan {Otáhal} and Jan {Jedelský} and Jan {Fišer} and Miroslav {Jícha}",
  title="Efficiency of the pressure and effervescent atomization",
  annote="The article deals with a description of the processes in the field of atomization by means of two different types of atomizers. The pressure atomizers are the most used in the industry. The term effervescent atomizer designates a two-phase nozzle with the inside mixing of two fluids. This type of nozzles is used as a substitute to the Y-jet atomizers as employed in burners. The comparison between efficiency of the pressure and the effervescent atomization may help decide which type of the atomizer is suitable for particular application. An evaluation of both of the types of atomization principles is based on experiments. With using PDA (Phase Doppler Analyzer) system, it is possible to acquire precise information about the spray quality in particular measurement points within the spray cone. The experiments were carried out on a model of an effervescent atomizer and three small pressure atomizers. Results from PDA measurement show that the spray cone and SMD (Sauter Mean Diameter) distributions are almost symmetrical, thus the measurements were carried out over one plane located at the nozzle axis in the distance of 150 mm from the discharge orifice. During the experiment, the effervescent nozzle was operated at different air pressure levels ranging from 0.1 to 0.5 MPa and mass GLR (Gas-to-liquid- ratio) from 0.1 to 25%. The liquid employed was water. Mass flow rates of water ranged from 5 up to 100 g.s-1. The nozzle was designed as an inside-out gas injection configuration. The inner diameter of the mixing chamber was 8 mm. Three small pressure nozzles were tested at the maximal pressure level of 0.5 MPa and flow rates covered the same range, as it was the case with the effervescent nozzle. Size and velocity distributions in the spray cone acquired are difficult to compare therefore integral values of mean diameters are needed. The spray quality was represented by a single integral value of a mean diameter. The comparison of these values, as obtained for two different spray patterns, provides information about the spray quality. SMD (Sauter Mean Diameter), D20 and D30 values from PDA measurement are necessary to define the integral values of SMD and D20. These two characteristics of the spray and flow rate characteristics (pressure level, flow rate) are essential when assessing the atomization efficiency. Generally, the single-phase atomizers reach higher efficiency then the two-phase nozzle. On the other hand, the twin-fluids nozzles produce spray with high quality in the large turndown ratio in the same pressure level range.",
  address="Mugla University",
  booktitle="Ilass Europe 2007",
  chapter="23720",
  howpublished="print",
  institution="Mugla University",
  year="2007",
  month="september",
  pages="76--79",
  publisher="Mugla University",
  type="conference paper"
}