Abstract
In this chapter, phase doppler anemometer (PDA) and particle image velocimetry (PIV) systems were used to experimentally study the characteristics of liquid jets. The two-dimensional PDA system (Dantec Dynamics, Skovlunde, Denmark) with its transmitting optics and receiving optics was used to measure the droplet diameter and velocity of a transverse liquid jet. Focal lengths were 500 mm for the transmitting optics and 1000 mm for the receiving optics, respectively, and the secondary scattering angle was 35°, as shown schematically in Fig. 7.1. A BSA Flow and Particle Processor, operating with BSA Flow V.5 Software, controlled the PDA system and data acquisition. The droplet velocities varied significantly with the distance from the injector, so the velocity parameters were set individually. The transverse and vertical velocity range was set from −150 to 400 m/s to 100–600 m/s and from −80 to 80 m/s to 0–150 m/s, respectively, considering the effect of the distance from the injector.
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