Journal of the Textile Machinery Society of Japan
Online ISSN : 1881-1159
Print ISSN : 0040-5043
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Volume 43, Issue 4
Displaying 1-3 of 3 articles from this issue
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  • Numerical Analysis of Viscoelastic Start-up Flow in Channels with a Tapered Contraction
    Takehiro Yamamoto, Kiyoji Nakamura
    1997 Volume 43 Issue 4 Pages 83-89
    Published: 1997
    Released on J-STAGE: October 24, 2006
    DOIhttps://doi.org/10.4188/jte1955.43.83
    JOURNAL FREE ACCESS
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    Start-up flow of viscoelastic fluid in two-dimensional channels with a four to one tapered contraction was numerically analyzed using the finite element method, and the transient behavior of viscoelastic flow was discussed. The Leonov model was applied to describe the rheological behavior of the fluid.
    In the flow through the tapered contraction, the velocity gradient in the flow direction, ∂u/∂x, along the center line became smaller than that in the flow through an abrupt contraction, and the maximum of the normal stress difference, Txx-Tyy, in the tapered contraction channel was also smaller than that of the flow in the abrupt contraction channel.
    The peak position of ∂u/∂x moved with time, and this phenomenon has not been observed in the numerical simulation of the start-up flow in the channel with the abrupt contraction.
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  • Flow Simulation of Fiber Suspensions in Polymeric Fluid through Abrupt Contraction
    Kazunori Yasuda, Taro Nishimura, Kiyoji Nakamura
    1997 Volume 43 Issue 4 Pages 90-96
    Published: 1997
    Released on J-STAGE: October 24, 2006
    DOIhttps://doi.org/10.4188/jte1955.43.90
    JOURNAL FREE ACCESS
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    The flow pattern and the orientation of fiber suspensions in polymeric fluids through a two-dimensional abrupt contraction are calculated using the Giesekus model and the Dinh-Armstrong model. The flow pattern of fiber suspensions in polymeric fluids is different from that of polymeric fluid; a vortex near the salient corner in the suspension flow becomes larger than that in the polymeric fluid flow. The dependence of the vortex length on a mobility parameter α in the Giesekus model and on a characteristic parameter of fiber suspension in the Dinh-Armstrong model is discussed.
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  • Material Design and Performance Evaluation of Porous Sintered Metal Ring for Spinning Frame
    Part 1:Relation between Compound Ratio of Sintering Additives and Porous State
    Hiroaki Kanai, Kiyohide Yagyu, Akira Maruta, Masaru Nakazawa, Takashi ...
    1997 Volume 43 Issue 4 Pages 97-104
    Published: 1997
    Released on J-STAGE: October 24, 2006
    DOIhttps://doi.org/10.4188/jte1955.43.97
    JOURNAL FREE ACCESS
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    This report deals with material design and performance evaluation of porous sntered metal to improve wear resistance and various other characteristics of a spinning ring. The static characteristics of the ring are studied for various compounding ratio of MoS 2 and FeMn in the sintering additive.
    Experimental results reveal that favareble shape and distribution of pores can be obtained if the compound ratio of FeMn is controlled at less than 30%.As the result suitable materials for spinning rings can be obtaineIt is also conformedthat good characteristics are obtainable in radial crushing strength and air permiability by controlling FeMn compound ratio less than 30%.
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