Buoyancy effects in complex jet flows
- City Univ. of New York, New York City, NY (United States)
Many industrial processes result in discharge of pollutants or heat into the atmosphere and into natural water bodies, be it rivers, lakes estuaries or coastal waters. The most common examples are the ubiquitous smoke stack, the use of multiport diffusers to release power plant discharges, submerged sewage outfall and treated municipal and industrial waste into natural waters. There is therefore a substantial interest in the design, performance and control of discharge devices and systems as well as in their ecological impact on the environment. In most cases the purposes of these devices is to increase mixing and dilution of an effluent discharge with the surrounding fluid. From the fluid mechanics aspect of the problem, the simpler form of these devices, is a jet which can be buoyant if the discharge is lighter or heavier than the ambient fluid. Flow visualization and mean vorticity measurements for a variety of buoyant jets and plumes issuing in stagnant, stratified or crossflow environment are carried out. The results indicate the existence of large scale structures in all investigated flows. In the case of jets into cross-streams wake-like or jet-like structures were observed. It appears that the vorticity in the so called bound vortex is weaker than the spanwise vorticity. A vortical sheet covers completely the bend over jet in the case of velocity ratio 0.5.
- OSTI ID:
- 435769
- Report Number(s):
- CONF-951135-; ISBN 0-7918-1755-5; TRN: IM9710%%427
- Resource Relation:
- Conference: 1995 International mechanical engineering congress and exhibition, San Francisco, CA (United States), 12-17 Nov 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the ASME Heat Transfer and Fluids Engineering Divisions: Fluid mechanics and heat transfer in sprays; Heat, mass and momentum transfer in environmental flows; Measurement techniques in multiphase flow; Multiphase transport in porous media. HTD-Volume 321; FED-Volume 233; Hoyt, J.W. [ed.] [San Diego State Univ., CA (United States)]; O`Hern, T.J. [ed.] [Sandia National Labs., Albuquerque, NM (United States)]; Presser, C. [ed.] [National Inst. of Standards and Technology, Gaithersburg, MD (United States)] [and others]; PB: 761 p.
- Country of Publication:
- United States
- Language:
- English
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