Investigation of turbulent spray disintegration characteristics depending on the nozzle configuration

Abstract

The experimental measurements were carried out to examine turbulent disintegration characteristics ejecting from a counter-flowing internal mixing pneumatic nozzle under variable conditions of swirl angles and air pressures. The air injection pressure was varied from 60 kPa to 180 kPa and four counter-flowing internal mixing nozzles with axi-symmetric tangential-drilled holes at swirl angle of 15°, 30°, 45°, and 60°to the central axis have been specially designed. The experimental results were quantitatively analyzed, focusing mainly on the comparison of turbulent atomization characteristics issuing from an internal mixing swirl nozzle. To illustrate the swirl phenomena, the distributions of mean velocities, turbulence intensities, volume flux, and SMD (Sauter Mean Diameter, or D32) were comparatively analyzed.

Numerical and experimental study on spray cooling system design for cooling performance enhancement of natural draft dry cooling towers

“…Additionally, the entrained airflow also causes the inward movement of small droplets from the out part to the central region, which results in gradually increasing SMD in the spray periphery, as is illustrated in Figure 3-8(a). This observation is consistent with the experimental investigation of Lee et al [186].…”

Effect of Low ALR on the Spray Characteristics of a Pressure-swirl Duplex Nozzle

“…He found that the ALR and geometry of the nozzle have a great influence on the characteristics of the spray. Lee et al (2002) indicated that an increase of ALR results in an expansion of radial growth rate, reducing the number of clusters and also enhancement of the disintegration of the liquid jet/sheet. Ferreira et al (2009) modified a twin-fluid nozzle to conduct an experiment determining the significance of the main involving parameters that characterize the issuing spray generated from the injector.…”