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Kinematic model for yarn movement in turbulent air flows

Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
In the textile industry a tool is needed that can predict fibre and yarn movement in turbulent air streams. The Institut für Textiltechnik of RWTH Aachen University (ITA) has developed a yarn model that can be used to study the movement of single fibres and yarns in turbulent air flows. The kinematic model is described in this article. Special attention is paid to the aerodynamic forces that determine the flight path of fibres and yarns. The coefficient of drag tangential to the fibre axis ct was studied thoroughly using computational fluid dynamics (CFD). It is shown that the diameter has a strong influence on the wall shear stress. Neglecting this effect for thin fibres can lead to errors in the coefficient of drag of a factor of 500. The turbulence intensity also has an important influence on the boundary layer development, which also determines the coefficient of drag. The assumptions made for the yarn model were tested in an experiment in which yarn flight paths were detected with a high-speed video camera. The comparison to the simulation results confirms the usability of the yarn model.
Rocznik
Strony
94--99
Opis fizyczny
Bibliogr. 17 poz.
Twórcy
  • Institut für Textiltechnik of RWTH Aachen University, Aachen, Germany, Eilfschornsteinstr. 18, 52062 Aachen Tel: +49 (0) 241 80 95-621, Fax: +49 (0) 241 80 92-149
autor
  • Institut für Textiltechnik of RWTH Aachen University, Aachen, Germany, Eilfschornsteinstr. 18, 52062 Aachen Tel: +49 (0) 241 80 95-621, Fax: +49 (0) 241 80 92-149
autor
  • Institut für Textiltechnik of RWTH Aachen University, Aachen, Germany, Eilfschornsteinstr. 18, 52062 Aachen Tel: +49 (0) 241 80 95-621, Fax: +49 (0) 241 80 92-149
Bibliografia
  • 1. Seide, G.; Jungbecker, P.; Gries, T.: Simulation of staple fiber kinematics in a turbulent air stream. Melliand International 14 (2008) 1, pp. 22–23.
  • 2. Bock, G.D.: Die Texturierung von Filamentgarnen im Luftstrom. Aachen, Techn. Hochsch., Diss., 1985.
  • 3. Lai, M.-C.; Peskin, C.S.: An immersed boundary method with formal second-order accuracy and reduced numerical viscosity. Journal of Computational Physics 160 (2000) 2, pp. 705–719.
  • 4. Seide, G.: Akustische Onlineüberwachung und Strömungssimulation von Verwirbelungsprozessen bei der Filamentgarnverarbeitung. Aachen, Techn. Hochsch., Diss., To be published in 2009.
  • 5. Mählmann, I.; Seide, G.; Jungbecker, P.; Gries, T.: CFD analysis for aerodynamic layed nonwovens. Chemical Fibers International 56 (2006) 5, pp. 314–316.
  • 6. Decker, S.: Zur Berechnung von gerührten Suspensionen mit dem Euler-Lagrange-Verfahren. Halle, Univ., FB Ingenieurwissenschaften, Diss., 2005.
  • 7. Morton, W.E.; Hearle, J.W.S.: Physical properties of textile fibres. Manchester; London: The Textile Institute; Butterworths, 1962.
  • 8. Kawabata, S.; Kawashima, Y.; Yamashita, Y.; Tanaka, A.: Bending property of the single wool fiber. 31st Textile Research Symposium at Mt. Fuji, Textile Machinery Society of Japan, Proceedings, Susono, JP, Aug 2–4, 2002, pp. 211–217.
  • 9. Doi, M.; Chen, D.: Simulation of aggregating colloids in shear flow, Department of Physics. Journal of Chemical Physics 90 (1989) 10, pp. 5271–5279.
  • 10. Marheineke, N.: Modeling of turbulence effects on fiber motion. Mathematica in Industry 8 (2005), pp. 366–370.
  • 11. Sucker, D; Brauer, H.: Fluiddynamik bei quer angeströmten Zylindern. Wärme und Stoffübertragung 8 (1975) 3, pp. 149–158.
  • 12. Dekkers, W.A.: Long slender cylinder in axial near-axial flow. Adelaide: University of Adelaide, Department of Mechanical Engineering, Diss., 2005.
  • 13. Fernholz, H.H.; Podtschaske, T.: Einige Überlegungen zur Geschwindigkeitsverteilung und zur Wandreibung in inkompressiblen rotationssymmetrischen turbulenten Grenzschichten mit Querkrümmung. In: Müller, U. (Hrsg.): Recent Developments in Theoretical and Experimental Fluid Mechanics : compressible and incompressible flows. Berlin [u.a.]: Springer, 1979.
  • 14. Keith, W.L.; Cipolla, K.M.; Hart, D.R.; Furey, D.A.: Drag measurements on long thin cylinders at small angles and high Reynolds numbers. Experiments in Fluids 38 (2005) 6, pp. 75–769.
  • 15. Glauert, M.B.; Lighthill, M.J.: The axisymmetric boundary layer on a long cylinder. Proceedings of the Royal Society of London 230 (1955), Series A: Mathematical and Physical Sciences 230 (1955) 1181, pp. 188–203.
  • 16. Ram, V.V.: Grenzschichttheorie höherer Ordnung für die Strömung an einer transversal gekrümmten Zylinderfläche beliebiger Gestalt. Bonn: Dokumentationszentrum d. Bundeswehr (DOKZENTBw), 1976.
  • 17. Bui, M. N.; Cebeci, T.: Combined free and forced convection on vertical slender cylinders. Journal of Heat Transfer Trans ASME 107 (1985) 2, pp. 476–478.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-2829f12d-203f-4b58-b707-ca5ca71eac80
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