COMSOL Modelling of the Gas Mixing Process in a Ripple Reducer for NPL’s Time Division Dilution System

J. Wang, B.A. Goody, and M.J.T. Milton
National Physical Laboratory, Teddington, Middlesex, UK

The mixing process of a ripple reducer designed for a time division dilution system (TDD) that dynamically generates calibration gas mixtures is modelled in 2D using COMSOL Multiphysics.

The model can been used to visualize and optimize the mixing process and extract parameters of interest at chosen times and positions.

The simulated time response of an analyte concentration agrees with experimental observation and other simulated results agree with expected features of the system.