Experimental studies on time-dependent size distributions of smoke particles of standard test fires

The time-dependent size distributions of smoke particles are measured by SMPS spectrometer as experiments go on, respectively, for four standard fires, i.e. TF2, TF3, TF4 and TF5. The results suggest that, for the TF4, the normalized number distributions of smoke aerosol be best fitted with lognormal functions and little time-dependency be shown throughout the experiments. It is also indicated that the best fitting curves of the normalized number distributions of smoke particles change from the so-called under-lognormal fittings to over-lognormal fittings for the TF2, TF3 and TF5, as time moves. In addition, a common changing trend of the size distribution curves can be drawn for the three standard fires. Namely, the curves mainly drift toward larger diameters of smoke particles and the peaks of the curves keep increasing as time goes by for each standard test fire.