transport of dangerous goods and risk management - Kirilo Savić

TRANSPORT OF DANGEROUS GOODS AND RISK MANAGEMENT 119COMPUTATIONALLY-BASED RESEARCHPhysical experiments as validation-basis for the computational approachIn the physical experiment, performed in left tube of the tunnel “Sentvid”, the position of the fireplace (calloricsizes: 1.5MW and 3.5MW) was at the 1130 th meter of length from the south entrance, in that two-lanes tunnel-part(after the bifurcation zone) where the cross-section is the rectangular one. The established velocity-field at about50m away from the fire place, as one of the measured entities in the physical experiment, was recorded in 4different heights (2,5m, 3,5m, 4,5m and 5,5m) above the tunnel-road and served as a referent value for thevalidation of the CFD-approach.Table 1. Velocity of the air-movement in Sentvid-tunnel during an physical experiment of a 3.5MW-fire usingnatural ventilation onlyMeasurementNo.Measurement height(m)Measured(m/s)velocity1. 3,50 1,72 12:0512h, 4min +Time of themeasurement2. 2,50 1,71 12:073. 2,50 1,86 12:084. 3,50 1,83 12:08Figure 6. CFD-estimated air-velocity at about 50m away from fire-place in “Sentvid”-tunnel in the event of3.5MW-fire