Ansys Chemkin allows you to optionally include transport data within the Gas-phase Kinetics Input File. This is similar to the options available for thermodynamic data. This option can be used to supplement or replace transport data that may be provided in a separate file (for example, tran.dat). In addition, this option may be particularly useful when reaction-rate constants are given in terms of the collision frequency (see the description of the COLLEFF keyword in Table 3.7: Alphabetical Listing of Gas-phase Reaction Auxiliary Keywords ). In such cases, the Lennard-Jones diameter, which is obtained from the transport data, is required for calculation of the collision frequency that is used to derive the reaction rate for those reactions. These are cases when transport data might not otherwise be required but the necessary data for specific species needed in the collision-frequency reactions may be included in the Gas-phase Kinetics Input File.

A full description of the syntax of this option is included in Transport Data .