. Effective heating of fuel ahead of spreading fire. Fire testing; Flame spread. X X. L (B) Scale-. cm. Figure 4.—Cross-sectional views of the location of thermocouples within the transverse and longitudinal members of the unit cell. A is transverse and B is longitudinal. Thermocouple positions are indicated by the crosses. The velocity of an advancing thermal wave in the longitudinal member, along with the rate of spread of the fire, is tabulated below. The packing ratio was held constant at 0.08. brze (Cm.) 0.6 Velocity Fire spread Thermal wave (Cm./sec.) 0.33 20.53* .6 .33 .53* 1.3 33 1.40

- Image ID: RDG2XE
. Effective heating of fuel ahead of spreading fire. Fire testing; Flame spread. X X. L (B) Scale-. cm. Figure 4.—Cross-sectional views of the location of thermocouples within the transverse and longitudinal members of the unit cell. A is transverse and B is longitudinal. Thermocouple positions are indicated by the crosses. The velocity of an advancing thermal wave in the longitudinal member, along with the rate of spread of the fire, is tabulated below. The packing ratio was held constant at 0.08. brze (Cm.) 0.6 Velocity Fire spread Thermal wave (Cm./sec.) 0.33 20.53* .6 .33 .53* 1.3 33 1.40
The Book Worm / Alamy Stock Photo
Image ID: RDG2XE
. Effective heating of fuel ahead of spreading fire. Fire testing; Flame spread. X X. L (B) Scale-. cm. Figure 4.—Cross-sectional views of the location of thermocouples within the transverse and longitudinal members of the unit cell. A is transverse and B is longitudinal. Thermocouple positions are indicated by the crosses. The velocity of an advancing thermal wave in the longitudinal member, along with the rate of spread of the fire, is tabulated below. The packing ratio was held constant at 0.08. brze (Cm.) 0.6 Velocity Fire spread Thermal wave _(Cm./sec.) 0.33 20.53* .6 .33 .53* 1.3 33 1.40 1.3 35 .95 The discrepancy between the rate of spread of the fire and the rate of spread of the thermal wave within the unit cell is a result of the quasi-steady character of the fire. Viewed at close range, the fire appears to stop at each transverse member and then quickly travel down the longitudinal member to the next transverse member where it waits again. Viewed from a distance, the average rate of spread draws our attention away from the unsteady motion of the fire on the microscale. The thermal wave is probably more representative of the longitudinal fuel member than of the fuel array. 2*Values obtained from adjacent longitudinal members in the same fire. 10. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Frandsen, William H. cn; Intermountain Forest and Range Experiment Station (Ogden, Utah) 1n. Ogden, Utah : Intermountain Forest & Range Experiment Station, Forest Service, U. S. Dept. of Agriculture

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