1. Influence of Atomizing Parameters on Droplet Properties in a Pulse Combustion Spray Dryer
- Author
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Zhifeng Xiao, Xiangdong Liu, Yuejin Yuan, and Xiangyan Xie
- Subjects
Condensed Matter::Quantum Gases ,Work (thermodynamics) ,Spectrum analyzer ,Chemistry ,General Chemical Engineering ,Airflow ,Nozzle ,Analytical chemistry ,Mechanics ,Pulse (physics) ,Physics::Fluid Dynamics ,Viscosity ,Physics::Atomic and Molecular Clusters ,Combustor ,Physics::Atomic Physics ,Physical and Theoretical Chemistry ,Dispersion (chemistry) - Abstract
A pulse combustor employed in a spray-drying system offers a new approach for liquid atomization that yields high-quality powders at low cost. Using a pulse combustion atomizer, there is no need for any form of nozzle dispersion and its atomization mechanism differs from those of conventional atomizers, such as rotary atomizers and pressure and pneumatic nozzles. In this work, based on the analysis of atomization mechanism, experiments of unsteady pulsating atomization were carried out in an experimental system of a Helmholtz-type pulse combustor. An optical analyzer was used for measuring the mean diameter of atomized droplet and droplet distribution. The effects of liquid feed rate, air flow oscillatory frequency, and liquid viscosity on atomized droplet size and size distribution were investigated and analyzed. The results indicate that the uniform droplet size distribution can be obtained under the conditions of a low feed rate, high-frequency pulsating flow, and moderate viscosity. The range of the d...
- Published
- 2008