B. Generating a Distribution for the Droplet Radius

The random distribution for the droplet radius for the ESD spray pyrolysis model in (6.1) is derived in this section. The volume fraction is evenly distributed along the droplets whose radii range from to . Therefore, the first step is to relate the radius distribution linearly to a value so that as goes from 0 to 1, goes from to :

 (249)

Next, the assertion is made that represents the evenly distributed volume number fraction, or normalized volume . Using the equation for the volume of a sphere, the relationship between volume and radius is established as

 (250)

Therefore, when the volume is evenly distributed, the effect on the radius will be . Initially, it might be counter-intuitive to note the inverse relationship since . However, when a volume of is distributed for a radius m, then

 (251)

where is the number fraction, resulting in . When the same volume is distributed for droplets of a radius m, then the calculation above leads to the number fraction , which is 8 times less, or times less.

 (252)

where is a normalization constant which must be found, is the randomly distributed radius, and is the radius relating and to an even volume distribution from (B.1)

 (253)

Inverting (B.5) to solve for allows to find the CPD function

 (254)

The derivative of (B.6) gives the PDF

 (255)

where it can be noted that the last term from (B.6) has disappeared. The only non-constant term in (B.7) is , therefore a replacement constant, which will be the new normalization constant is introduced for simplicity

 (256)

and (B.7) can be rewritten to

 (257)

Using the PDF from (B.9), we can now proceed to find the normalized distribution , but first the normalization constant must be found by integrating (B.9) with respect to from to and equating the integral to 1

 (258)

which can be solved to

 (259)

giving the normalization constant

 (260)

and the normalized PDF

 (261)

Now one can integrate the normalized PDF from to to find the CPD

 (262)

and invert the CPD to find the quantile function and solve for

 (263)

which gives the equation for the radius distribution between and when the volume number fraction is evenly distributed and .

L. Filipovic: Topography Simulation of Novel Processing Techniques