1. PMMA DOWNWARD SPREAD

2. Downward Flame Spread Experiment
Stepper Motor
Lead Screw
PID Control
Linear actuator system

3. 2τ = 25 microns
2τ = 44 microns
2τ = 75 microns

4. VCF Corp. PMMA; 2τ = 25, 44, 75 μm; Static (Vg = 0); Atmosphere: 30 % RH, 25 °C, 21 % O2; Nov

5. VCF Corp. PMMA; 2τ = 25, 44, 75 μm; Static (Vg = 0); Atmosphere: 30 % RH, 25 °C, 21 % O2; Nov

6. 21%O2: 1atm:1g: PMMA
Comparison of Experimental and Computational results for half thickness
Thickness study is done for 12.5 micro m ,22 micro m and 37.5 micro m
Half-Thickness(tau)
micron
Computational Spread rate mm/s
Experimental Spread rate
mm/s
12.5
10.275
8.87 22
6.435
6.57
37.5
4.091
3.93

7. 21%O2: 1atm:1g: PMMA
Comparison of Experimental and Computational results for half thickness; log-log graph
Thickness study is done for 12.5 micro m ,22 micro m and 37.5 micro m
Thickness(tau)
micron
Computational Spread rate mm/s
Experimental Spread rate
mm/s
12.5
10.275
8.87 22
6.435
6.57
37.5
4.091
3.93

8. Vertical image Temp:21%O2: 1atm:1g: PMMA:Gaurav
12.5 Tau
37.5 Tau
22 Tau
12.5 tau vf = mm/s
22tau vf = mm/s
37.5tau vf =4.091mm/s

9. VCF Corp. PMMA; 2τ = 75 μm; Static (Vg = 0); Atmosphere: 30 % RH, 25 °C, 21 % O2; Nov-08-2011

10. VCF Corp. PMMA; 2τ = 50 μm; Static (Vg = 0); Atmosphere: 30 % RH, 25 °C, 21 % O2; Nov-18-2011
Front View
Side View

11. VCF Corp. PMMA; 2τ = 50 μm; Static (Vg = 0); Atmosphere: 30 % RH, 25 °C, 21 % O2; Nov-18-2011

12. VCF Corp. PMMA; 2τ = 50 μm; Static (Vg = 0); Atmosphere: 30 % RH, 25 °C, 21 % O2; Nov-18-2011