Use of dcalc on Example 16.3-1

 

In Matlab:

Here are your compounds' formulae and names:
No. Formula Name
----------------------------------------
 1 Ar argon 
 2 O2 oxygen 
>> help dcalc

 Chapman-Enskog formula for mass diffusivity coefficient for binary mixtures
 
 function D = dcalc(p,T,index)
 
 Argument List:
 p [=] pressure in kPa
 T [=] temperature in the units of Tdeg
 index [=] index of 2 compounds in cnms whose Dab is to be found
 (If this argument is omitted, Dab will be found for the first 2)
 Returns:
 D [=] mass diffusivity in units of m2/s
 
 Ex: >> clear
 >> start402
 >> d = dcalc(0.0099, 298, [1 2])
 d =
 1.8961e-05 Created 3/21/95-2 Jim Lee

>> dcalc(101.325,293.2)
ans =
 1.8818e-05
>> ans*1e4  <-- Changing to cp
ans =
 0.1882 in cm^2/s Compare to answer found with Maple