Effective Stack Height

Effective Stack Height - 9/13/11 Aerosol &...

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Unformatted text preview: 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 11 Effective Stack Height Virtual or Equivalent Height Stack characteristics ( e.g?) Meteorological conditions ( e.g?) Physical & chemical nature of the effluent ( e.g?) Vertical momentum typically dissipated within 30 s Thermal buoyancy terminates when cooling by sufficient atmosphere entrainment stack actual rise plume h h H + = Buoyant plume : Initial buoyancy >> initial momentum Forced plume : Initial buoyancy ~ initial momentum Jet : Initial buoyancy << initial momentum 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 22 Carson and Moses : vertical momentum & thermal buoyancy, based on 615 observations involving 26 stacks. (stable) 24 . 2 04 . 1 (neutral) 64 . 2 35 . (unstable) 15 . 5 47 . 3 u Q u d V h u Q u d V h u Q u d V h h s h s h s +- = + = + = ( 29 a s p h T T C m Q- = s s RT P V d m 4 2 = (heat emission rate, kJ/s) (stack gas mass flow rate. kg/s) u : wind velocity at the stack exit (m/s) 9/13/11...
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Effective Stack Height - 9/13/11 Aerosol &...

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