Airflow over wavy yarn in air-jet filling insertion

Abstract

Airflow over the wavy yarn during air-jet filling insertion is analyzed theoretically. Two flow regimes are considered in the analyses: subsonic and supersonic flows over the yarn. Expression for drag coefficient as a function of air velocity is obtained for both cases. Numerical simulations were made for certain practical situations and comparison is made between the drag force on the yarn in subsonic and supersonic flows.