Global stability of buoyant jets and plumes

Experiments on stability and oscillatory behavior of planar buoyant plumes

Experiments on the onset of buoyant instabilities leading to periodic formation of vortical structures in planar buoyant plumes of helium and helium/air mixtures injected into quiescent air are reported for a range of nozzle widths (w520– 70 mm), plume fluid densities ~pure helium to that approaching air!, and velocities at the nozzle exit. First, the plume parameters corresponding to the onset...

Optimal mixing of buoyant jets and plumes in stratified fluids: theory and experiments

Complete List of Authors: Camassa, Roberto; The University of North Carolina at Chapel Hill, Department of Mathematics Lin, Zhi; Zhejiang University, Department of Mathematics McLaughlin, Richard; University of North Carolina at Chapel Hill, Department of Mathematics Mertens, Keith; University of North Carolina at Chapel Hill, Department of Mathematics Tzou, Chung-Nan; The University of North C...

A finite-difference analysis of turbulent, axisymmetric, buoyant jets and plumes

Large-eddy simulation of starting buoyant jets

Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Abstract A series of Large Eddy Simulations (LES) are performed to investigate the penetration of starting buoyant ...

Buoyant plumes and vortex rings in an autocatalytic chemical reaction.

Buoyant plumes, evolving free of boundary constraints, may develop well-defined mushroom-shaped heads. In conventional plumes, overturning flow in the head entrains less buoyant fluid from the surroundings as the head rises, robbing the plume of its driving force. We consider here a new type of plume in which the source of buoyancy is an autocatalytic chemical reaction. The reaction occurs at a...