الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
There are many types of spinning systems are available to form the yarn from thedifferent fibers, for example, ring spinning, compact spinning, open-end spinning, air vortexspinning, air jet, and siro-spun spinning and so on among them ring spinning is most commonand useable spinning system because of its advantages in compared to the other spinningsystems. Overall yarn properties can be enhanced by introducing of simple devices forexample, air jet nozzle on traditional ring spinning machine to improve a developed systemas jet-ring spinning. Jet-ring spinning integrates features of ring and air-jet spinningtechnologies by the means of a single air jet nozzle that was placed between front rollers andyarn lappet in ring spinning system. The whirling air current within the nozzle is able toround the protruding hairs around the main yarn body, in this manner decreasing yarnhairiness.It is interesting therefore to understand the swirling air flow behavior inside the air jetnozzle to foresee and control its impact on the produced yarns properties. ComputationalFluid Dynamics (CFD) has risen to be a standout amongst the most vital fields of study thatplays a fundamental part in the modern engineering environment, since it gives a overall andproper view of the fluid flow inside an item or structure, giving the chance to recognize anyblemishes and loopholes, and resolve them in the design state itself, in this way, savingproduct or system development costs and time.In this research, a CFD model is presented to study the effects of some air jet nozzlestructural parameters as injector angle, nozzle length, and air pressure level on the swirlingflow generated inside the nozzle. Followed by design and construct a mechanism forproducing jet ring and modified jet ring yarns. Finally an experimental study on the effect ofsome nozzles and yarn parameters on jet ring and modified jet ring yarn properties waspresented aiming to illustrate the role of inserting the air jet nozzle for improving thesesystems.