巻号一覧
22 巻 (1994)
- 4 号 p. 185-
- 3 号 p. 111-
- 2 号 p. 57-
- 1 号 p. 5-
22 巻, 1 号
選択された号の論文の7件中1～7を表示しています
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-最も簡単な細糸延伸方程式とその解の全容-加瀬 晋1994 年 22 巻 1 号 p. 5-17
発行日: 1994/03/15
公開日: 2012/11/20
ジャーナル フリーThe present paper is the first of a series of manuscripts which are devoted to extensive discussion of thin filament equations, i.e. the simultaneous partial differential equations governing the continuous drawing and transient stretching of liquids taking the shape of thin filaments. This paper exclusively deals with thin filament equations in their simplest form, namely the equations governing the isothermal melt spinning of Newtonian fluids. Subjects covered are 1) formulation of the equations, 2) solution for the steady state spinning, 3) perturbation equations around the steady state spinning, 4) analytical transient solution of the perturbation equations, 5) numerical transient solution of perturbation equations for the constant takeup speed spinline, 6) frequency response transfer functions, 7) stability of spinline, 8) numerical solution of the nonlinear thin filament equations simulating the draw resonance oscillation, 9) analysis of spinline transients in Lagrangean (τ, τ′) coordinates, 10) equivalence to the classical wave equation and 11) analysis of one-shot transient stretching of thin filaments in Lagrangean. (τ, λ) coordinates.抄録全体を表示PDF形式でダウンロード (1723K) -
中丸 八郎, 砂田 良雄, 長瀬 洋一1994 年 22 巻 1 号 p. 18-22
発行日: 1994/03/15
公開日: 2012/11/20
ジャーナル フリーFailure and slip on the wall in the straight pipe were studied for highly filled suspension (HSF) of kaolin-water including additives. To visualize the deformation of HFS, red mark lines were inserted. Complete slip between HSF and solid wall was observed.
It was confirmed that Coulomb' s criterion was valid for the failure between flat wall and HSF, and was different from that in the bulk suspension. The equilibrium equation between the failure shear stress at the wall and extrusive pressure by piston was derived on the assumption that the extrusive pressure was equal to the axial stress at the wall. The prediction, which showed the variation of extrusive pressure along the axial direction, was in good agreement with the experimental result.
It was also showed that the increase of wall stress with slip flow velocity after the failure was equal to the superposed friction resistances of motion to the static failure stress.抄録全体を表示PDF形式でダウンロード (567K) -
中丸 八郎, 桑井 雅巳, 長瀬 洋一1994 年 22 巻 1 号 p. 23-26
発行日: 1994/03/15
公開日: 2012/11/20
ジャーナル フリーFollowing the foregoing work, extrusions in the cone were studied for highly filled suspension (HSF) of kaolin-water system including additive. By the visualization, the slip line was observed within the HFS, instead of wall slip reported in the previous paper.
In the cone, the only one slip line was observed with a fixed boundary condition. Therefore, the direct analysis for slip can be applied different from the usual slip line analysis. The ordinary differential equations for slip angle, η, and mean principal stress, σm, were solved directly with the boundary condition as function of radius, γ. Observed slip lines agreed well with the theory.
The extrusive pressure calculated by integrating the stress component of the extruding direction along the slip line also agreed well with the corresponding piston load. Thus, the present method was useful.抄録全体を表示PDF形式でダウンロード (467K) -
関 眞佐子1994 年 22 巻 1 号 p. 27-31
発行日: 1994/03/15
公開日: 2012/11/20
ジャーナル フリーThe motion of a rigid cylindrical particle freely suspended in a two-dimensional channel flow is studied numerically at low Reynolds numbers. The particle is assumed to be an elliptic cylinder or a doublet consisting of two equal-sized circular cylinders held in rigid contact. The Stokes equations for the suspending fluid are numerically solved with a finite element method for an estimate of the longitudinal, lateral and angular velocities of the particle at conditions of zero force and zero torque on the particle. Using the velocities obtained, the trajectories of the particle are determined for various initial configurations. The particle is found either to tumble or to oscillate cyclically, depending on the particle size / channel width ratio, particle shapes and initial conditions. In the former case, both of elliptic cylinders and doublets rotate continuously in one direction during one period, which is well approximated by so-called Jeffery's solutions for a spheroid in unbounded simple shear flow. In the latter case, the particle oscillates in rotation, accompanied by a periodic sidewise drift. The sidewise drift of doublets is about the centerplane of the channel, while the mean lateral position of elliptic cylinders is either on or of the centerplane.抄録全体を表示PDF形式でダウンロード (839K) -
工藤 益男, 岩倉 賢次, 増子 徹1994 年 22 巻 1 号 p. 32-36
発行日: 1994/03/15
公開日: 2012/11/20
ジャーナル フリーStatic flow properties of magnetic paints containing hexagonal shaped Barium-Ferrite fine particles have been investigated in terms of their diameter/thickness aspect ratio. The Ba-Ferrite paints showed typical pseudo-plastic flow behaviors with different yield stresses. The flow curves were divided into three types of flow components using Kuin equation as follows: (1) yield stress part, (2) Newtonian flow part, (3) viscoelastic deformation of flocs with stress relaxation.
Each flow curve for the Ba-Ferrite paint could be well-fitted to the theoretical trace by the Kuin equation, and four kinds of rheological parameters were obtained from those procedures. We found that such parameters except for the Newtonian viscosity increase with increasing particle aspect ratio or particle specific surface area. This implies that the rheological properties of Ba-Ferrite paints are strongly governed by the particle interaction forces associated with particle characteristics.抄録全体を表示PDF形式でダウンロード (614K) -
小牧 秀之, 仙名 保1994 年 22 巻 1 号 p. 37-44
発行日: 1994/03/15
公開日: 2012/11/20
ジャーナル フリーSteady viscous flow and dispersion properties of aqueous suspensions containing monodispersed silica microspheres of 0.9 μm were studied with special emphasis on the effect of PVA addition as a function of pH. Larger amount of PVA adosrption, observed at lower pH, always favored better dispersion and lower apparent viscosity. An apparent median particle size of the flocs in the stagnant suspension was mainly dominated by electrostatic repulsion and accordingly by pH. While the zeta-potential was determined solely by the surface species of the particles coated with either Al2O3 or ZrO2, silica substrate was suspected to affect the adsorption behavior of PVA on the silica particles, coated particularly by Al2O3.抄録全体を表示PDF形式でダウンロード (1772K) -
石森 俊広, 仙名 保1994 年 22 巻 1 号 p. 45-50
発行日: 1994/03/15
公開日: 2012/11/20
ジャーナル フリーThe correlation between rheological behavior of a slurry, composed of silica microspheres and poly (vinylalcohol) (PVA), and microstructure and also the disintegration behavior of spray-dried granules were studied. Pseudoplastic flow behavior was analyzed under the Bingham approximation to obtain the Bingham yield value, τB, plastic viscosity, ηpl, and bulkiness of the flow unit, CFP. CFP is the ratio of the effective volume fraction of flocs, φF, to that of dry solid, φP. The dispersion of silica in the slurries was dominated by PVA adsorption at low pH and the electrostatic repulsion at high pH. The granules prepared from the slurry at pH=7 had the smallest apparent density and disintegrated under the smallest applied load. It is concluded that the microstructure and disintegration behavior of the granules are greatly affected by pH values at which the slurries are prepared, in spite of the similar flow behavior.抄録全体を表示PDF形式でダウンロード (748K)
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