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論文
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津田, 武明 ; 長谷川, 富市 ; 鳴海, 敬倫 ; Tsuda, Takeaki ; Hasegawa, Tomiichi ; Narumi, Takatune
概要:
金沢大学先端科学・社会共創推進機構<br />One-dimensional flow model for non-Newtonian fluids in a single cavity die with a slot is present
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ed. The equations of mass and momentum in a cavity are treated one-demensionally by assuming an appropriate mean flow over the cross section of the flow. The flow field inside the slot is assumed to be fully developed. The equations of flow for the cavity and the slot are derived and then coupled. We use a finite difference method to solve these governing equations. It is concluded that cavity's geometry and fluid properties affect the uniformity of the flow from the slot, and the presented model agrees with the experimental result.
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津田, 武明 ; 長谷川, 富市 ; 鳴海, 敬倫 ; Tsuda, Takeaki ; Hasegawa, Tomiichi ; Narumi, Takatune
概要:
金沢大学先端科学・社会共創推進機構<br />One-dimensional flow model for non-Newtonian fluids in a dual cavity slot die is presented. The v
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iscosity of non-Newtonian fluids is treated as the Ellis model. The conservation equations of mass and momentum in a dual-cavity slot die are one-dimensionally simplified by assuming an appropriate mean flow over the cross section of the flow. The flow field in the slot is assumed to be fully developed. The equations of flow for the cavity and the slot are derived separately and then coupled. We use a finite difference method to solve these governing equations. Using this model, we find that the location and the cross-section area of a secondary cavity have large effects on the distribution of outlet flow. It is concluded that the dual cavity die can effectively reduce the flow non-uniformity.
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論文
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津田, 武明 ; 長谷川, 富市 ; 鳴海, 敬倫 ; Tsuda, Takeaki ; Hasegawa, Tomiichi ; Narumi, Takatune
概要:
金沢大学先端科学・社会共創推進機構<br />One-dimensional flow model for non-Newtonian fluids in the inside of a slot die is presented. The
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viscosity of non-Newtonian liquids is given by the Ellis model. The conservation equations of mass and momentum in the slot die are treated one-dimensionally by assuming an appropriate mean flow over the cross section of the flow. The flow field in the slot is assumed to be fully developed. The equations of flows for the cavity and the slot are derived separately and then coupled. We use a finite difference method to solve these governing equations. It is concluded that a flow model using the Ellis model for liquid viscosity is useful to predict the distribution of flow rate from the die.
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中野, 公一 ; 山本, 和秀 ; 津田, 武明 ; 京藤, 敏達 ; Nakano, Koichi ; Yamamoto, Kazuhide ; Tsuda, Takeaki ; Kyotoh, Harumichi
概要:
金沢大学先端科学・社会共創推進機構<br />Prediction of particle concentration distribution from a slot die is presented. The uniformity of
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particle concentration distribution is predicted by the particle trajectory in a slot die. In order to depict the movement of particles in the slot die, we coupled the one-dimensional flow equations in a slot die and Stokesian sedimentation equation. It is concluded that Reynolds number and particle diameters affect the uniformity of the particle concentration from the slit, and the predictions using the presented model agree with the experimental results.
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中野, 公一 ; 津田, 武明 ; 京藤, 敏達 ; Nakano, Koichi ; Tsuda, Takeaki ; Kyotoh, Harumichi
概要:
金沢大学先端科学・社会共創推進機構<br />In this study, the uniformity of particle concentration in a cavity die containing the unstable d
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ispersed particles is predicted by using one-dimensional flow model for non-Newtonian fluid in a cavity and the Stokesian sedimentation model. In order to depict the movement of particles, the equation combining the one-dimensional flow equation in a cavity with the particle concentration equation predicting the sedimentation is derived. We investigated the resolution to avoid the sedimentation from the operational and material point of views. As a result, we found the appropriate conditions to prevent from the problems.
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木綿, 隆弘 ; 歌野原, 陽一 ; 中村, 晶 ; 木村, 繁男 ; 小松, 信義 ; 山田, 紘司 ; 菅原, 康裕 ; 中道, 淳平
概要:
In the present study, the distributions of time-averaged and fluctuated wall shear stresses downstream from an orifice w
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ere measured using a Flow Vector Sensor of MEMS (Micro Electro Mechanical System). The air flow was supplied to a circular pipe from a blow-down wind tunnel. The diameter of the pipe is D = 194 mm and the diameter of the orifice is d = 97mm, yielding a diameter ratio of 0.5. The axial distance from separation (orifice) to reattachment was approximately 2.5D. Near the wall in the recirculating region, the minimum mean wall shear stress was located at approximately x/D = 1.75, and the maximum rms value of the wall shear stress was approximately x/D = 1 - 2. The experimental results were found to approximately agree with the numerical results obtained previously by Large-eddy simulation. It seems that using the fluctuated wall shear stress to estimate the FAC(Flow-Accelerated Corrosion) rate of the circular pipe wall downstream from the orifice is appropriate. ©2013 The Japan Society of Mechanical Engineers.
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