Aerosol Deposition on Electroformed Wire Screens

Figures & data

FIG. 1 Photographs of electroformed wire screens that were experimentally tested for aerosol deposition characteristics. (a) Screen A of Table 1, 20 mesh with a wire width of 65 μm. (b) Screen B of Table 1, 45 mesh with a wire width of 35 μm.

TABLE 1 Commercially available electroformed screens used in study.

	Screen Designation
Parameter	A	B	C	D
Fraction of open area, fOA	0.90	0.88	0.75	0.56
(dimensionless)
Mesh size, (Number of	20	45	50	40
openings/inch)
Wire width, dw (μm)	65	35	68	160
Opening width, (μm)	1204	528	440	475

FIG. 2 Experimental setup used in the screen deposition studies.

FIG. 3 Schematic of computational domain used in modeling deposition of aerosol particles on screen wires. (a) Side view. (b) Top view.

TABLE 2 Range of numerical and experimental test parameters for the test screens

	Screen
Parameter	A	B	C	D
Velocity, Uo (Range), m/s
Experimental	0.11–1.06	0.19–1.93	N/A	N/A
Numerical	0.04–1.06	0.08–1.93	0.08–0.85	0.16–1.62
Particle Size, μm AD
Experimental	4–20	4–20	N/A	N/A
Numerical	4–20	3–20	4–20	4–20
Stokes Number, Stk
Experimental	0.56–19.0	0.63–14.7	N/A	N/A
Numerical	0.58–19.8	0.54–20.3	0.49–15.1	0.51–12.3
Reynolds Number, Re c
Experimental	0.5–5	0.5–5	N/A	N/A
Numerical	0.5–5	0.5–5	0.5–5	3–30

FIG. 4 Collection of aerosol particles on screens: comparison of numerical predictions with results of physical experiments. (a) 20 × 20 mesh. (b) 45 × 45 mesh.

FIG. 5 Numerically predicted efficiencies for four electroformed wire screens, the details of which are given in Table 1. On the right-hand scale, the asymptotic values of the curves (1-f_OA ) are 0.10, 0.12, 0.25, and 0.44 for Screen Types A, B, C, and D, respectively.

FIG. 6 Correlation curve for standardized efficiency predictions (Equation [13]) for electroformed wires together with experimental and numerical data used to generate the correlation.

FIG. 7 Pressure coefficient, C_P /G, as a function of wire Reynolds number for electroformed wire screens. The parameter values for the screens are given in Table 1. Symbols are numerical data and the solid lines are plots of the correlation, Equation (18).