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Cox, G., 1975. GAS VELOCITY MEASUREMENT IN FIRES BY THE CROSS-CORRELATION OF RANDOM THERMAL FLUCTUATIONS. Fire Research Notes 1032
Thermal fluctuations are employed as natural tracers to determine gas flow velocities in fire gases channelled under a ceiling. Results obtained using this cross-correlation technique are in reasonable agreement with those obtained by more conventional methods where interpretation in the presence of turbulence is difficult.