Journal of the Textile Machinery Society of Japan

Calculation of Velocity and Stress Distributions of Two-Dimensional Jet in Viscoelastic Slow Flow

Kiyoji Nakamura, Zyun'ichi Sugimoto, Akira Horikawa

1980 Volume 26 Issue 4 Pages 99-106
Published: 1980
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.26.99

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Two-dimensional Barus effect was calculated for a viscoelastic slow flow between two parallel plates, considering elastic effect and surface tension.
The results are as follows: As the elastic effect increases, the normal stress difference and its gradient increase, and the axial velocity distribution of the jet becomes a plateau at a short distance. Hence, the expansion ratio in viscoelastic jets increases.

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Elastic Tensile Recovery of a Viscoelastic Model under Power Law

Takuji Yamaguchi, Taruaki Yanagawa, Hiroshi Kimura

1980 Volume 26 Issue 4 Pages 107-114
Published: 1980
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.26.107

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The Boltzman and the Schapery equations of a time-strain reduced type are used for the linear and the nonlinear models, respectively. The predicted results from both models have experimentally been discussed by two kinds of polyethylene films at room temperature.
The fractional elastic recovery (U.E.R.) of the linear model is constant regardless of the initial strain ε₁; when holding time t_r; =0, and increases with ε₁; when t_r; >0. U.E.R, of the nonlinear model is smaller than that of the linear model and the difference between them is larger at higher ε₁; . If a solid shows more stress relaxation and stronger nonlinearity, its U.E.R. is smaller. The experimental results of U.E.R. are qualitatively similar to U.E.R. predicted by using the nonlinear model.
The fractional delayed elastic recovery (D.E.R) can only be calculated from the linear model. D.E.R. of the model is constant regardless of ε₁; when t_r; =0, and decreases with ε₁; when t_r; >0. A solid exhibiting a remakable stress relaxation has higher rate of delayed recovery and larger D.E.R. The experimental results of D.E.R. show remarkable nonlinearlity and are inconsistent with the linear theory.

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Yarn End Retrieving from Bobbin in Axisymmetric Accelerated Flow

Part 1: Some Considerations based on Wall Pressure Distribution

Tsuneo Hirai, Tsutao Katayama, Toyoki Tanaka, Naomichi Heya, Sadasuke ...

1980 Volume 26 Issue 4 Pages 115-120
Published: 1980
Released on J-STAGE: October 24, 2006

DOIhttps://doi.org/10.4188/jte1955.26.115

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This paper discusses the optimum condition for retrieving a broken yarn end on a bobbin by air flow. Comparison is made between calculated results by Finite Element Method and those experimentally obtained by models.
Good agreement is obtained between both results to show that retrieving yarn ends is more dependent on air flow acceleration, especially on acceleration variation, than air flow speed.

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