Size distribution of spray droplets from simple two-fluid nozzle
- Inst. of Nuclear Sciences VINCA, Belgrade (Yugoslavia). Lab. for Thermal Engineering and Energy
The results of the investigation of the performance characteristics of two-fluid nozzle (a type of simple pneumatic nozzle) are shown in this paper. A comparison of the drop-size distribution for the conditions studied. Studies were carried out of the effect of nozzle internal diameter, exit orifices` diameters, feed rate and gas pressure on droplet size distribution. In all experiments performed, air has been used as a gas phase, and 3% solution of nigrosine in water as a liquid phase. After detailed analysis of existing droplet sampling techniques, immersion sampling technique was accepted. Solution was sprayed into small cells, with glass bottom, filled with kerosene, positioned at the several distances from the nozzle. Results obtained were processed using different size distribution functions (experimental: Nukiyama-Tanasawa, Rosin-Rammler, Mugele-Evans, and theoretical: Gaussian, logarithmic, Gamma, etc.), by calculating adequate parameters for each distribution function. The most appropriate agreement of experimental results was obtained by Nukiyama-Tanasawa and Gamma size distribution functions. The Sauter mean diameter was also calculated and compared with the same diameter obtained from different size distribution functions. An equation is recommended for estimation of droplet size (Sauter mean diameter) under different nozzle working conditions. Preliminary experimental investigations, have shown that direct incineration of liquid fuels can be performed in a fluidized bed by means of a simple pneumatic two-fluid nozzle. That was the main reason for carrying out this investigation.
- OSTI ID:
- 435747
- Report Number(s):
- CONF-951135--; ISBN 0-7918-1755-5
- Country of Publication:
- United States
- Language:
- English
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