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BSA Flow Software Installation and User's Guide - CSI

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D30 The volume mean diameter is calculated from the mean of the droplet<br />

volumes:<br />

D<br />

⎧ 1<br />

⎨<br />

⎩<br />

Ni<br />

30 = ∑ N i=<br />

1<br />

1<br />

3<br />

⎫ 3 ni<br />

Di<br />

⎬<br />

⎭<br />

It is used for hydrology <strong>and</strong> mass flux applications.<br />

D31 The mean evaporative diameter or volume-length mean diameter is<br />

calculated from the mean of the droplet volumes:<br />

D<br />

31<br />

⎧<br />

⎪<br />

= ⎨<br />

⎪<br />

⎪⎩<br />

N<br />

i<br />

∑<br />

i=<br />

1<br />

Ni<br />

∑<br />

i=<br />

1<br />

1<br />

2<br />

3 ⎫<br />

niD<br />

i<br />

⎪<br />

⎬<br />

n ⎪<br />

i Di<br />

⎪⎭<br />

It is used for evaporation <strong>and</strong> molecular diffusion applications.<br />

D32 The Sauter mean diameter (SMD) is calculated as:<br />

D<br />

32<br />

N<br />

i<br />

∑<br />

= i<br />

i=<br />

1<br />

N<br />

∑<br />

i=<br />

1<br />

n<br />

n<br />

3<br />

i Di<br />

i<br />

It is used for mass transfer <strong>and</strong> reaction.<br />

D43 The De Broukere is calculated as:<br />

Dv0.1, Dv0.5, Dv0.9<br />

D<br />

43<br />

N<br />

i<br />

∑<br />

= i<br />

i=<br />

1<br />

N<br />

∑<br />

i=<br />

1<br />

n<br />

n<br />

D<br />

2<br />

i<br />

4<br />

i Di<br />

3<br />

i Di<br />

It is used for combustion applications.<br />

Dv0,98 The fractional volume diameters represent the particle diameters below<br />

which 10%, 50%, 90% or 98% of the total volume is contained, i.e. where<br />

the cumulative function of the volume distribution (Q3) has the value 0.1,<br />

0.5, 0.9 or 0.98, respectively:<br />

Q3(Dv0.1) = 0.1<br />

Q3(Dv0.5) = 0.5<br />

Q3(Dv0.9) = 0.9<br />

Q4(Dv0.98) = 0.98<br />

Span The span is an indicator for the width of a size distribution. This parameter<br />

actually describes the steepness of the cumulative curve of the volume<br />

distribution:<br />

D − D<br />

Span =<br />

D<br />

V0.9 V0.1<br />

V 0.5<br />

⋅100%<br />

<strong>BSA</strong> <strong>Flow</strong> <strong>Software</strong>:Reference guide 7-111

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