@inproceedings{09e3fef7749b412e9d67c2dad9d7a757,
title = "Round turbulent thermals, puffs, starting plumes and starting jets in uniform crossflow",
abstract = "The self-preserving properties of round turbulent thermals, puffs, starting plumes and starting jets, in unstratified and uniform crossflow, were investigated experimentally. The experiments involved dye-containing fresh water (for nonbuoyant flows) and salt water (for buoyant flows) sources injected vertically downward into crossflowing fresh water within a water channel. Time-resolved video images of the flows were obtained using CCD cameras. Experimental conditions were as follows: source exit diameters of 3.2 and 6.4 mm, source Reynolds numbers of 2,500-16,000, source/ambient velocity ratios of 4-35, source/ambient density ratios (for buoyant flows) of 1.073 and 1.150, volumes of injected source fluid (for thermals and puffs) comprising 16-318 source diameters, streamwise (vertical) penetration distances of 0-200 source diameters and 0-13 Morton length scales (for buoyant flows) and crosstream (horizontal) penetration distances of 0-620 source diameters. Near-source behavior varied significantly with source properties but the flows generally became turbulent for streamwise distances within 5 source diameters from the source and became self-preserving for streamwise distances from the source greater than 40-50 source diameters. Crosstream motion satisfied the no-slip convection approximation. Streamwise motion for self-preserving conditions satisfied the behavior of corresponding self-preserving flows in still fluids: round thermals and puffs in still fluids for round thermals and puffs in crossflow and two-dimensional line thermals and puffs in still fluids for round starting plumes and jets in crossflow. The no-slip convection approximation for crossflow motion combined with self-preserving approximations for streamwise motion was also effective for predicting flow trajectories at self-preserving conditions for steady round turbulent plumes and jets in crossflow.",
keywords = "Jets, Plumes, Puffs, Scaling, Thermals, Turbulence",
author = "Diez, {F. J.} and Bernal, {L. P.} and Faeth, {G. M.}",
year = "2003",
doi = "10.1115/ht2003-47038",
language = "English (US)",
isbn = "0791836940",
series = "Proceedings of the ASME Summer Heat Transfer Conference",
publisher = "American Society of Mechanical Engineers",
pages = "21--34",
booktitle = "Proceedings of the 2003 ASME Summer Heat Transfer Conference, Volume 2",
note = "2003 ASME Summer Heat Transfer Conference (HT2003) ; Conference date: 21-07-2003 Through 23-07-2003",
}