- Author
-
Presser, C.
|
Avedisian, C. T.
- Title
- Phase Doppler Measurements of Liquid Agent Transport Over a Heated Cylinder.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
Cornell Univ., Ithaca, NY
- Book or Conf
- Halon Options Technical Working Conference. Proceedings. PROGRAM AND ABSTRACTS. HOTWC 2003. Sponsored by: 3M Specialty Materials, Chemical Development Studies, Inc., DuPont Flororproducts, Great Lakes Chemical Corp., Halon Alternative Research Corp., Hughes Associates, Inc., Kidde-Fenwal, Inc., Modular Protection Corp., Next Generation Fire Suppression Technology Program, Sandia National Labs. May 13-15, 2003,
Albuquerque, NM,
50-50 p.,
2003
- Keywords
-
halon alternatives
|
halons
|
fire protection
|
computational fluid dynamics
|
fire suppression
|
turbulent flow
|
droplet transport
|
homogeneous turbulent flow
|
model validation
|
phase Doppler interferometry
- Abstract
- Experimental results are presented for a well-characterized, droplet-laden homogenous turbulent flow field around a cylindrical obstacle. Liquid agent transport (which was water for this study) was investigated around an unheated and heated cylinder under ambient conditions. 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, droplet 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 m) are entrained into the recirculation zone. Near the heated cylinder surface, thermal effects reduce droplet mean size significantly.