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Abstract

The efficiency of the air-twist nozzle has a direct effect on the uniform tension of spandex yarn during the winding and unwinding process. The different geometries of the air-twist nozzle were studied as a reference. Compressed air coming out of the air orifice flows through the wall of the yarn channel in a twisting motion. The purpose of this research is to develop an air-twist nozzle geometry which has well-twisted motion, with reasonable vorticity strength and velocity. The paper presents investigations of the effects of the inlet pressure and the yarn channel shape of the air-twist nozzle. The Ansys CFX was used to perform steady simulations of jet flow inside the air-twist nozzles. Results of computational simulations for the two most promising cases were confirmed by experimental tests. The twist and flow patterns, specifically vorticity and velocity inside the air twist nozzles, are discussed in this paper. As a result of this research, an air-twist nozzle of improved design is now being produced for commercial use.

Keywords

air-twist nozzle spandex yarn twisted flow vorticity strength

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