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Volume 44, Issue 1
Displaying 1-7 of 7 articles from this issue
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Kazuhiro Nakashima, Yoshiyuki Komoda, Hiroshi Suzuki, Hiromoto Usui2007 Volume 44 Issue 1 Pages 4-9
Published: January 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDesign of particle handling processes requires the characteristics of powder on flowability. Although various indices exist, most were obtained from the static characteristics and cannot express the dynamic effect. In the case of liquid or gas, the characteristic of flowability is represented by viscosity. Especially in the case of liquid-solid suspension, it is well known that the viscosity changes by the degree of particle agglomeration, and the agglomeration of suspended particles is determined by “particle interaction”. However, the characteristics of powder layer have not been well understood. In this study, a method to measure the viscosity of a gas-solid suspension was developed. FT4 powder rheometer was used to measure the torque exerting on the blade, which rotated and descended into a powder layer. These data were used to calculate the viscosity of powder layer. We concluded that the well-known powder index for flowability may represent its dynamic characteristics and that the powder viscosity may provide more detailed information on powder flowability.View full abstractDownload PDF (2082K) -
Kouichi Nagata, Hiroyuki Takase2007 Volume 44 Issue 1 Pages 10-18
Published: January 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSEffect of functional groups in acrylic polymers on alumina suspension and alumina green sheets was investigated. The polymers were butyl methacrylate homopolymer and butyl methacrylate-functional monomer copolymers. The suspension prepared by homopolymer showed shear thinning behavior, indicating the alumina particles were flocculated. However, the copolymer studied in the present work well dispersed 0.6μm alumina particles. The amount of adsorbed polymers containing 0.25mol% function groups increased in the order of -COOH, -NR2, -OH copolymers. The same influential order of functional groups was also recognized in the green sheet's packing degree as well as of the reduction in viscosity at 5s-1, TI value and yield stress of suspension using these polymers as binders.View full abstractDownload PDF (899K) -
Tetsuji Yamaguchi, Kikuo Okuyama2007 Volume 44 Issue 1 Pages 19-27
Published: January 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA photon correlation spectroscopy (PCS) apparatus has been developed for measuring nanoparticles with diameters below 10nm by improving the individual components and the data reduction methods. The PCS is capable of sampling and storing photon counting data with multi-bit capability at the same time interval on each channel. We evaluated the performance of the new PCS apparatus: (1) accuracy of average size measurement as compared with a conventional PCS apparatus, (2) accuracy of particle size distribution measurement at a constant flow rate, and (3) ability for in-situ hydrodynamic diameter measurement for metallic single nanoparticles. Experimental results show that the newly developed PCS has an improved performance over the conventional PCS system for in-situ hydrodynamic diameter measurement for nanoparticles below 10nm in diameter.View full abstractDownload PDF (4042K) -
Basis and Usage of KAPSELKang Kim, Yasuya Nakayama, Ryoichi Yamamoto2007 Volume 44 Issue 1 Pages 28-36
Published: January 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe have released a colloid simulator named KAPSEL implemented the “Smoothed Profile (SP) method” for direct numerical simulations of particulate flow. KAPSEL computes the fluid velocity and the electrostatics potential by solving both Navier-Stokes and Poisson equations directly. The time evolutions of the colloidal particles and the density of counter ions are then determined by solving Newton's equation of motion and advection-diffusion equation, respectively, in a consistent manner so that the electro-hydrodynamic coupling can be fully taken into account. The electrophoretic mobility of spherical colloidal particles is calculated in several situations including those in concentrated dispersions. The comparisons with theories show excellent quantitative agreements.View full abstractDownload PDF (2333K) -
2007 Volume 44 Issue 1 Pages 49-50
Published: January 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4158K) -
Fumio Saito2007 Volume 44 Issue 1 Pages 51-52
Published: January 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1544K) -
Shigeo Miwa2007 Volume 44 Issue 1 Pages 53
Published: January 10, 2007
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1860K)
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