| 초록 |
Air gap (AG) between the spinneret nozzle and coagulation bath (CB) has been known as one of the most important factors in polyacrylonitrile (PAN) fiber fabrication by a dry-jet wet spinning process. A number of literature studies showed that a too long AG leaded to filament breakage and decreasing the jet stretch. In order to speed up the production line, the AG should be as small as possible. However, once the bath solution touches the spinneret nozzle, the process is interrupted. A two-phase gas-liquid volume of fluid (VOF) computational fluid dynamics (CFD) model was employed for evaluating the CB design towards a high speed process, while keeping a stable liquid surface wave height (LSWH) and an acceptable vorticity of liquid solution near the PAN fiber injection zone. Using the CFD simulation, the optimum CB design with a stable LSWH and lowest fluid vorticity was found. |
