Atomization and Sprays Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

For Online Access

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1991, Volume1

Issue 3

112 pages

Issue price - $75.00

Harry N. Buckner
Thermal Sciences and Propulsion Center, School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907

Paul E. Sojka
Maurice J. Zucrow Laboratories (formerly Thermal Sciences and Propulsion Center), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, USA

The performance of a new type of fuel-injection nozzle that is capable of producing fine sprays when atomizing high-viscosity Newtonian fluids allow air-liquid ratios is reported. The nozzle, termed an effervescent atomizer, is a form of twin-fluid injector that operates by forming a well-mixed two-phase flow within the nozzle body. Shadow photographs show that atomization is accomplished via rapid expansion of gas bubbles after they exit the nozzle. Particle size measurements demonstrate that mean droplet diameters of 25 μm can be obtained for fluids with viscosities ranging from 400 to 968 cP at an air-liquid ratio of 0.15. Particle size measurements also indicate that mean droplet diameter is a strong function of air-liquid ratio while being nearly independent of liquid viscosity, fluid supply pressure, and mixture mass flow rate over the range of conditions tested.

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