The drawing process is important for basalt fibre production. Studies of the flow and heat transfer in the process can contribute to raising the quality and strength of basalt fibre and avoiding fibre breakage. A numerical model describing heat transfer and flow in the fibre drawing of basalt fibre was constructed. The numerical simulation was based on appropriate simplifications. The geometrical shape, temperature, velocity and viscosity distributions of the fibre were obtained by solving the continuity, momentum and energy equations using the finite differential method. The governing equations were discretised in a tridiagonal matrix form and were solved using the tridiagonal matrix algorithm and the alternative direction implicit solver. The results showed that the basalt fibre cone is tapered, the rate of change of radius decreasing with distance from the nozzle. The shape of basalt fibre cone is related to nozzle diameter and final fibre diameter. The rates of change in velocity, temperature and viscosity are biggest in the mid section. Solidification of basalt fibre depends on cooling condition in the air. The results provide a theoretical basis for choosing and regulating technological parameters in fibre drawing basalt fibre.
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