Orientation of Disk-like Particles in a Microcomposite Processing

Yasuda, Kazunori; Ohara, Norihiro; Môri, N.; Chiba, Kazuhiro

doi:10.4188/transjtmsj.58.t29

Cited by 7 publications

(8 citation statements)

References 12 publications

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“…Furthermore, in the previous flow visualzation [11] we observed a strand pattern in a talc suspension flow through a slit channel. It was confirmed from numerical simulations that the transparent/translucent strand pattern was ascribed to the flow-induced shade region produced by thin disk-like particles [12].…”

Section: Introductionmentioning

confidence: 69%

“…In this framework, the evolution of the orientation of thin disk-like particles in both a planar extensional flow and a simple shear flow of Newtonian fluids through a large reservoir to a slit channel was analyzed by numerical calculation of the Jeffery equation, then the numerically simulated results were compared with the orientation observations in a talc suspension flow [11]. Furthermore, in the previous flow visualzation [11] we observed a strand pattern in a talc suspension flow through a slit channel.…”

Section: Introductionmentioning

confidence: 91%

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Numerical Simulation for Orientation of Thin Disk Particles in a Newtonian Flow through a L-Shape Channel

Chiba

Komatsu

2007

J. Text. Eng.

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Orientation evolution of thin disk particles, such as talc and mica, in a Newtonian flow through a L-shape channel was numerically simulated by decoupling flow kinematics with particle orientation using the Jeffery equation to obtain the knowledge of the processing of thin micro-particle reinforced composites: (1) periodic flip-over of a thin disk particle moving near the channel wall can be clearly observed for large initial azimuthal angle: (2) when a thin disk particle rounds the corner of a L-shape channel, a disk particle tends to align in the direction perpendicular to the flow plane as it approaches alignment along the streamline.

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 91%

Numerical Simulation for Orientation of Thin Disk Particles in a Newtonian Flow through a L-Shape Channel

Chiba

Komatsu

2007

J. Text. Eng.

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“…In the previous experiments [11] observation of disk-like particle orientation was conducted in a slit channel flow as shown in Fig. 2(a).…”

Section: Orientation In a Simple Shear Flowmentioning

confidence: 99%

“…In this framework, the evolution of the orientation of thin micro-particles, such as talc and mica which were modeled by a thin disk-like particle, in both a planar extensional flow and a simple shear flow of Newtonian fluids through a large reservoir to a slit channel was analyzed by numerical calculation of the Jeffery equation [10] in a previous paper [11], then the numerically simulated results were compared with the orientation observations in a talc suspension flow. Furthermore, in the previous flow visualzation we observed a strand pattern in a talc suspension flow through a slit channel with 2 mm in thickness and 16 mm in width.…”

Section: Introductionmentioning

confidence: 99%

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Migration and Orientation of Micro-Disk Particles in a Newtonian Flow through a Slit Channel

Yasuda¹,

Nishimura²,

Chiba

2006

J. Text. Eng.

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The objective of this study is to well understand the migration and orientation of thin micro-particles, such as talc and mica, in a suspension flow through a slit channel as well as to obtain the knowledge of the sheet processing operations of thin micro-particle reinforced composites by means of both experiments and numerical simulations. The following result was obtained in this study: (1) migration of thin micro disk-like particles did not occur in a slit channel flow, thus the concentration distribution was almost uniform: (2) transparent/translucent strand pattern observed in a suspension flow with thin micro disk-like particles was ascribed to the flow-induced shade region produced by disk-like particles, i.e., this phenomenon arises from frequent flip-over of disk-like particles.

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Velocity Profiles of Suspension Flows through an Abrupt Contraction Measured by Magnetic Resonance Imaging

2007

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Velocity profiles in steady flows of fluid/particle mixtures through a duct with an abrupt contraction were measured by magnetic resonance imaging. Aqueous solutions of carboxymethyl cellulose containing particles, including spheres, disklike particles, and short fibers, at high volume fractions were used. As a result, a plug-like velocity profile was observed in a straight duct flow for every suspension, but the velocity profile depends on the particle shape at contraction. Disklike particles caused an unsteady flow, and short fibers caused a concave shape in the velocity profile near the centerline upstream of the contraction. Spheres did not affect the flow field. The concave profile became obvious with increased volume fraction of fiber. This result is caused by the larger elongational viscosity of the fiber suspension near the centerline of the channel, as compared with that of the sphere suspension.

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Orientation of Disk-like Particles in a Microcomposite Processing

Cited by 7 publications

References 12 publications

Numerical Simulation for Orientation of Thin Disk Particles in a Newtonian Flow through a L-Shape Channel

Numerical Simulation for Orientation of Thin Disk Particles in a Newtonian Flow through a L-Shape Channel

Migration and Orientation of Micro-Disk Particles in a Newtonian Flow through a Slit Channel

Velocity Profiles of Suspension Flows through an Abrupt Contraction Measured by Magnetic Resonance Imaging

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