Methods for estimating wake flow and effluent dispersion near simple block-like buildings
This report is intended as an interim guide for those who routinely face air quality problems associated with near-building exhaust stack placement and height, and the resulting concentration patterns. Available data and methods for estimating wake flow and effluent dispersion near isolated block-like structures are consolidated. The near-building and wake flows are described, and quantitative estimates for frontal eddy size, height and extent of roof and wake cavities, and far wake behavior are provided. Concentration calculation methods for upwind, near-building, and downwind pollutant sources are given. For an upwind source, it is possible to estimate the required stack height, and to place upper limits on the likely near-building concentration. The influences of near-building source location and characteristics relative to the building geometry and orientation are considered. Methods to estimate effective stack height, upper limits for concentration due to flush roof vents, and the effect of changes in rooftop stack height are summarized. Current wake and wake cavity models are presented. Numerous graphs of important expressions have been prepared to facilitate computations and quick estimates of flow patterns and concentration levels for specific simple buildings. Detailed recommendations for additional work are given.
- Research Organization:
- National Oceanic and Atmospheric Administration, Silver Spring, MD (USA). Air Resources Lab.
- DOE Contract Number:
- AI05-76EV03688
- OSTI ID:
- 5359876
- Report Number(s):
- NOAA-TM-ERL-ARL-108; ON: DE82008600; TRN: 82-011702
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AIR POLLUTION
DIFFUSION
BUILDINGS
AERODYNAMICS
PLUMES
TURBULENCE
AIR FLOW
AIR POLLUTION CONTROL
AIR QUALITY
BOUNDARY LAYERS
DIMENSIONS
EARTH ATMOSPHERE
ENVIRONMENTAL TRANSPORT
EXHAUST GASES
FORECASTING
GRAPHS
HEIGHT
MANUALS
MATHEMATICAL MODELS
POLLUTION SOURCES
ROOFS
STACK DISPOSAL
STACKS
VENTILATION
WIND
CONTROL
DOCUMENT TYPES
ENVIRONMENTAL QUALITY
FLUID FLOW
FLUID MECHANICS
FLUIDS
GAS FLOW
GASEOUS WASTES
GASES
LAYERS
MANAGEMENT
MASS TRANSFER
MECHANICS
POLLUTION
POLLUTION CONTROL
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
500100* - Environment
Atmospheric- Basic Studies- (-1989)
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
510500 - Environment
Terrestrial- Site Resource & Use Studies- (-1989)