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EngineeringMaterials

Rosin Rammler

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Rosin-Rammler cumulative distribution

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Interface

#include <codecogs/engineering/materials/rosin_rammler.h>

double Rosin_CDF (double Dm, int n, double D)
Rosin-Rammler cumulative distribution

Function Documentation

Rosin CDF Calculator
  
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doubleRosin_CDFdoubleDm
intn
doubleD )
The Rosin-Rammler distribution is frequently used to describe the particle size distribution of powers of various types and sizes. The function is particularyly suited to representing particles generated by grinding, milling and crushing operations. The conventional Rosin-Rammler function is described by
R = exp \left [ - \left ( \frac{D}{D_m} \right )^n \right ]
where R is the retained weight fraction of particles with a diameter greater than D, D is the particle size and D_m is the mean particle size, and n is a measure of the spread of particle sizes.

The Cumulative Distribution Function (CDF) is therefore
R_{cdf} = 1- exp \left [ - \left ( \frac{D}{D_m} \right )^n \right ]

As an additional note, the PDF is:
R_{pdf} = -\frac{n}{D} \left ( \frac{D}{D_m} \right )^n exp \left [- \left( \frac{D}{D_m} \right )^n \right ]

\graph  Dm=0.1e-3, n=2, D=0:0.3e-3

If you have observed data, then a least square regression analysis can used to fit the data points.
References:
K.M. Djamarani and I.M. Clark, 1997. Powder Technology, Elsevier Science. 93, No 2, pp. 101-108(8)
Parameters:
Dmmean particle diameter
nmeasure of the spread of particle sizes
Dparticle size
Authors:
Will Bateman (2006)
Source Code:

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