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( Muh Rong Wang ),( Tien Chu Lin ),( Che Jui Yang ),( Yang Sheng Huang ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
This paper investigates the droplet transport phenomenon in the developing region of the spray injected by the atomizer with internal impinging mechanisms. The characteristics of the spray are measured by a two-component phase Doppler particle analyzer (PDPA) and the images are taken by a high speed camera. Instantaneous flow image shows the intermittence of the spray jet as injected with internal impingement. On the other hand, a large-scaled sinusoidal flow structure along the axial direction is observed when the spray jet is injected without internal impingement. Hence flow impingement inside the atomizer has strong effects on the structure of the spray jet because of the enhanced mixing processes between the liquid and gas phases. It turns out that the spray jet with internal impingement has a wider and more uniform distribution. Measurements of the distribution of the spray droplets and volume flux justify the above observation.
Performance of Twin-Fluid Atomizers with flow Impingement
( Muh Rong Wang ),( C. J. Yang ),( Tien Chu Lin ),( J. S. Chiu ),( K. H. Yang ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
This paper describes the characteristics of the twin-fluid atomizers with and without flow impingement. Malvern RT-Sizer and the particle image velocimetry (PIV) are used to measure the particle size and spray flow field. Velocity measurement by the PIV system indicates that the spray flow is decelerated in the axial direction and accelerated in the radial direction, resulting in a highly interactive flow pattern between particles. It also results in the formation of a large scale vortex and enhances the flow entrainment near the substrate. Results also show that the particle distribution of the atomizer with external substrate is more concentrated, indicating the re-distribution of the spray droplets during the flow impingement. It also implies that the flow impingement can be used as the mechanism to control the particle size distribution of the spray flow for particular engineering applications.