Rosin Ramml Er Fitting
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Transcript of Rosin Ramml Er Fitting
7/24/2019 Rosin Ramml Er Fitting
http://slidepdf.com/reader/full/rosin-ramml-er-fitting 1/1
Purpose:
Fitting a 2-value data set to a Rosin-Rammler formula.
Method:
The general form of the Rosin-Rammler equation is:
R=e
− D Dnn
where: R is the %retained at a size D and !oth Dn and n are fitting parameters.
"iven two points R1 retained at size D1 and R2 retained at size D2 the two fitted parameters ma# !e
determined as follows:
Dn=e$p
lnln
R×ln D2−lnln
R2×ln D
lnln
R
ln
R2 and n=
lnln
R
ln D
Dn
&n'e fitted the %retained R at an# size D 'an !e estimated form the general form of the equation:
R=e
− D Dnn
and an# size D that sees a %retained R 'an !e determined !#:
D=n
ln%
R× Dn
n or rearranged as D=[ln
R × Dn
n]/n
(is'laimer: )*+ ,T &)R &/ R0*1.The author will not a''ept an# responsi!ilit# for loss or damage 'aused !# use of these formulae. The equations have not
!een tested under stringent 'onditions that allow them to !e 'onsidered ro!ust enough for +ngineering use. People using thismethod must themselves a''ept responsi!ilit# to 'onfirm that results are 'orre't and appli'a!le to the appli'ation !eing
'al'ulated.
omments wel'ome: ale$.doll3agd'onsulting.'a
CALCULATION COVER SHEET Date: 28-Nov-06
Author: Alex Doll
Project: General engineering Calc No:
Title: Deriving general fitting equations for Rosin-Rammler
formula for 2-point case 1