Numerical Simulation Of The Foggy Yarn And Study The Effect Of Sending Clean Air To Spinning Machine

With the rapid development of industry and city construction, the air pollution in our country becomes serious. The majority of the air pollution in our country is soot, some city include other things like car exhaust. there are many minute soot and black carbon in the air because of the serious air pollution. As the film existing in dust and water droplets , the range of dust which the size of soot between 0.03μm～0.6μm and black carbon between 0.01μm～0.2μm is difficult to wash out to use spilled water in Air-conditioned room. The dust is too small to filter from conventional methods. These particles can enter the spinning department with the fresh air of the air condition system or the penetrating air through the gaps of the maintenance structures. And these particles were the pollution sources of the foggy yarn. The foggy yarn can make a negative affect on the quality of the yarn, and bring huge economic losses to the textile company.Based on the major means of numeric simulation and lab test, this paper studies the velocity pattern and pressure field around the bobbin yarn when the yarn revolves with high speed, the result shows that the negative pressure will appeared near around the wandung of the bobbin yarn, and the airflow will come to the wandung from the two outsides. We measure the velocity and pressure of some points around the bobbin yarn, according to the comparison of the numeric simulation results and the test result. we can conclude that the numeric simulation is feasible. The particles will get close to the bobbin yarn because of the airflow organization, and will absorbed in the bobbin yarn. When the number get enough, the bobbin yarn will appear black, that is what we call " foggy yarn " .The airflow organization in the spinning department also affected the minute particles. Fluent is utilized in this paper to do the numerical simulations of various air supplying modes. This paper shows the charts of velocity, temperature and humidity and the analyses of the results. The results express the way that air supplying from house top and machine top and back to bottom is feasible in the spinning department. According to depth study of foggy yarn, found that air flow around bobbin yarn is the important reason that foggy yarn occurs. This paper will study the way of sending clean air to bobbin yarn to prevent foggy yarn, the clean air will change air current around bobbin yarn. The particle can't get close to bobbin yarn and the static electricity force can be weakened, then foggy yarn will be avoided.