Experimental results are presented for a well-characterized, droplet-laden homogenous turbulent flow field around a cylindrical obstacle. Liquid agent transport was investigated around an unheated and heated cylinder under ambient conditions. Results for water are reported in this investigation. For the heated case, the cylinder was heated initially to a near-surface temperature of approximately 423 K. Phase Doppler interferometry and visualization techniques were used to explore the thermal effects on droplet surface impingement, vaporization, and transport around and downstream behind the cylinder, by providing information of droplet size and velocity in the vicinity of the cylinder. Results indicated that impinging droplets generally coat the surface with few droplets rebounding back into the free stream. Downstream in the wake region of the cylinder, smaller size droplets (generally, of less than 30 μm) are entrained into the recirculation zone. Near the heated cylinder surface, thermal effects reduce droplet mean size significantly.
Citation: Special Publication (NIST SP) - 984-4
NIST Pub Series: Special Publication (NIST SP)
Pub Type: NIST Pubs