Deposition of SiO₂ Nanoparticles Produced in a Turbulent H₂/O_m2 Flame

Figures & data

FIG. 1 (a) Experimental set-up and (b) flame configurations (flames 1a, 2, and 3 from left to right).

TABLE 1 Gas inlet velocities in m/s for the different flames

	Inner nozzle	1st ring	2nd ring	3rd ring
Flame 1a,1b	38.5	8.1	7.7	1.9
Flame 2	33.5	3.2	1.6	5.7
Flame 3	12.3	4.3	4.2	0.9

FIG. 3 Radial temperature profiles for different distances from the exit of the burner for flame 1a. Measured values are from Müller et al. (2003) and calculation from Figure 5.

FIG. 2 Planar (a) and perpendicular (b) plots of calculated temperatures for flames 1a, 2, and 3 from left to right.

TABLE 2 Comparison of measured and predicted deposition efficiencies

	Flame 1a	Flame 1b	Flame 2	Flame 3
Measured (extrapolated)	49%	44%	32%	82%
Predicted	39%	—	30%	71%
Predicted with	35%	—	23%	66%
thermophoresis

FIG. 4 Planar (a) and perpendicular (b) plots of calculated streamwise velocities for flames 1a, 2, and 3 from left to right.

FIG. 5 (a) Instantaneous image of the particle-laden flow with additional seeding and processed velocity vectors for flame 1a. (b) Measured and calculated streamwise mean velocity on the centre line as a function of streamwise position.

FIG. 6 Planar plots of calculated streamwise velocity fluctuations for flames 1a, 2, and 3 from left to right.

FIG. 7 Particle deposition locations on the cylinder for flames 1a, 2, and 3 from left to right.

FIG. 8 Particle concentration on the central plane perpendicular to the cylinder for flame 1a (left), with thermophoretic force (middle), and laminar tracking (right).

Müller , D. , Triebel , W. , Bochmann , A. , Schmidl , G. , Eckardt , D. , Burkert , A. , Röper , J. and Schwerin , M. 2003 . Two-Dimensional Concentration and Temperature Measurements in Extended Flames of Industrial Burners Using PLIF . Proc. SPIE , 5191 : 66

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