Peclet number

(chemical engineering) Dimensionless group used to determine the chemical reaction similitude for the scale-up from pilot-plant data to commercial-sized units; incorporates heat capacity, density, fluid velocity, and other pertinent physical parameters.

[Etymology: J. C. E. Péclet; France 1793-1857] rheology As Pe, relating to heat transport, a measure of transference of thermal energy in a fluid, the dimensionless ratio of the product of speed and a representative length to thermal diffusivity.International Standards Association
[ ISO 31-12:1992 Quantities and Units: Characteristic Numbers]
[Mills I., Cvitas T., Homan K., Kuchitsu K. Quantities, Units and Symbols in Physical Chemistry, 2nd edn (Oxford: Blackwell, 1993)] Identically the product of the Prandtl number and the Reynolds number. As Pe*, the Péclet number for mass transfer, relating to transport of matter in a binary mixture, the dimensionless ratio of the product of the mass transfer coefficient and a representative length to the diffusion coefficient.International Standards Association
[ ISO 31-12:1992 Quantities and Units: Characteristic Numbers]
[Mills I., Cvitas T., Homan K., Kuchitsu K. Quantities, Units and Symbols in Physical Chemistry, 2nd edn (Oxford: Blackwell, 1993)] Identically the product of Pe and the Lewis number, and of the Reynolds number and the Schmidt number.