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Fire Dynamics Tools | Ch. 9 | Eq. 9.3
Virtual Origin over Diameter
Calculates the virtual origin to diameter ratio for a fire plume
Reference
Fire Dynamics Tools (FDTs): Quantitative Fire Hazard Analysis Methods for the U.S. Nuclear Regulatory Commission Fire Protection Inspection Program. NUREG-1805.
Equations
z_o/D = -1.02 + 0.083 \frac{ \dot{Q}^{2/5} }{ D }