Meltblown processes are industrial processes for the production of finest-fiber nonwovens. Therefore, we simulate the stretching of filaments by hot, fast and turbulent airflow.
In the meltblown process, the molten polymer is fed through the nozzles into a forward-flowing high-speed and highly turbulent air stream to be stretched and cooled down. The resulting fibers are laid down onto the conveyor belt. In contrast to melt-spinning processes, where the stretching is caused by mechanical take-up, in melt-blowing the fiber jet thinning is due to the driving high-velocity air stream with its turbulent nature.
The expectation of a maximal fiber elongation of 106 in the industrial meltblown process requires a very fine spatial and temporal resolution. Simulation is performed by using the following strategy that is motivated from the observation of the process: