Smoke Plume Entrainment Calculator

Calculate smoke plume mass flow rate and entrainment for axisymmetric, wall, and corner plume configurations

Input Parameters

Results

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Mass Entrainment Rate
kg/s
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Volume Flow Rate
m3/s
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Volume Flow Rate
CFM
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Plume Temperature Rise
C
Note: The plume configuration significantly affects entrainment. A wall plume entrains less air than an axisymmetric plume for the same fire, reducing exhaust requirements. Corner plumes entrain even less. Always verify plume type based on fire location.

Reference

NFPA 92 Plume Equations: Axisymmetric: m = 0.071*Qc^(1/3)*z^(5/3) + 0.0018*Qc Wall: mirror image method (2x fire, half entrainment) Corner: mirror image (4x fire, 1/4 entrainment) Balcony Spill: m = 0.36*(Q*W)^(1/3)*(z+0.25*Hb) Flame Height: zl = 0.166*Qc^(2/5)