simulation Computational fluid dynamics applied to carbon fibre manufacturing Computational fluid dynamics (CFD) is an effective tool to optimize the design of oxidation ovens used in carbon fibre manufacturing. By Dr. Bill Stry Senior Process Technology Engineer Harper International C FD simulations evaluate the influence of oxidation oven parameters such as width, height, and tow spacing on velocity and temperature uniformity, cold air ingress, and hot air escape. For furnaces, simulations show the extent that process vents disturb flow uniformity and also compare side and bottom vents. Oven design optimizing tool Computational fluid dynamics has Fig. 2: Mid-plane oven section view Fig. 3: CFD results of oven end seal gas velocities at the inner and outer slots No94 January - February 2015 / Feature Carbon Fig. 1: 3D model of oven The oxidation of carbon fibre precursor generates toxic hydrogen cyanide (HCN) and creates fire risks due to the flammable material and exothermic reaction. Convection ovens used for this process must provide efficient atmosphere sealing to contain the HCN. They also must have uniform, high-velocity airstreams to remove the exothermic heat. jec composites magazine 29