Important Notice

This web site will be shut down permanently on July 1, 2026, when I retire from
Colorado State University. For those of you who have been using the Chemkin calculation
tools, they cannot be transferred to a different server maintained by another individual.
I was permitted to host these calculators because I was one of the (minor) authors of
Chemkin II, and Sandia allowed me to offer them subject to some restrictions. Since January 2010
the calculators have been used successfully more than 730,000 times, with the equilibrium
calculator being the runaway favorite, and the homogeneous chemical kinetics calculator the
least used (zero times, in fact).

Dimensionless Groups

 

This spreadsheet will calculate dimensionless groups that commonly appear in non-isothermal, reacting gas flows. Some properties depend on temperature, pressure, and composition, while others also depend on length and velocity scales characteristic of the system under study.

 

  Temperature:

  (Required)
  Pressure:

  (Required)

  Length scale:

  (Optional) 

  Velocity scale:

  (Optional) 

You can enter
a velocity, or
a flow rate
and diameter
or area, and
the velocity
will be
computed.

or  

  Flow Rate (STP):

 
 

and

 
  Conduit/pipe
diameter:

 
 

or

  Cross sectional
area for flow:

 

 

Currently, at least two species must be specified. If one species is present in excess, such as a bath gas or diluent, list it first.

 

Species Name

Moles or
Mole Fraction

  
    Having trouble? Please click on the button
to see a list of recognized species names