- Author
-
Huq, P.
- Title
- Measurements of the Density Field of Buoyant Plumes (And Some Visualizations of Density Stratified Flows). BFRL Fire Research Seminar.
Seminar. VHS Video.
- Coporate
- University of Delaware, Newark
- Report
-
Video
December 9, 1997
- Keywords
-
buoyant plumes
- Abstract
- Comparisons are made of the evolution of the density field of buoyant plumes for laminar and weakly turbulent crossflows for otherwise identical mean flow parameters. The effect of turbulence in the crossflow is to increase entrainment and dilution, with the consequence of lower plume trajectories. RMS levels of density fluctuations are approximately equal in magnitude to the value of the local mean; however, time series shows that peak values are an order of magnitude greater than the local mean. Crosswind distributions of moments show near Gaussian values at the cente rof the plume but indicate skewed and peaked distributions at the plumes' edges. Analysis of the conditional signal of density reveals that values of the intermittency and non-dimensional burst frequency are inhomogeneous. Evaluation of the duration and spacing between events indicates that instaneous large density fluctuations will persist for surprisingly large distances.