Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 45, Issue 7
Displaying 1-8 of 8 articles from this issue
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  • Numerical Simulation of Solid-Liquid Flows Involving Free Surface by DEM-MPS Method
    Mikio Sakai, Seiichi Koshizuka, Itaru Toyoshima
    2008 Volume 45 Issue 7 Pages 466-477
    Published: July 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.466
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    In many solid-liquid two phase flow systems, the spatial discretization scale of liquid phase is larger than that of solid phase. This is one of the problems in calculating large-scale solid-liquid low systems effectively. A new multi-scale Lagrangian model of solid-liquid two phase flows is proposed to simulate the large-scale systems. This model is developed by coupling Discrete Element Method (DEM) with Moving Particle Semi-implicit (MPS) method. This is named as the multi-scale DEM-MPS method. The multi-scale DEM-MPS method makes it possible to treat the spatial discreization scale of the solid and the liquid phase equally by modeling the drag force and the contact force. This is because the drag force acting on the solids and the energy dissipation due to collision depend on the solid size. Two cases of two-dimensional dam-break flow simulation were carried out to investigate the effectiveness of the multi-scale model, where the solid phase volume fraction was 10% and 20% with the original size of 100μm. The simulations were performed by using the calculated solid whose size was 100 times larger than the original one. The multi-scale Lagrangian model could simulate the original particle behavior from the viewpoints of the suspension by following the fluid streamlines.
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  • Effect of Trace Components of Seawater on Water Content of Sea-Salt Aerosol
    Toshiyuki Nomura, Taiki Nishimoto, Aiko Sakashita, Yasuhiro Konishi
    2008 Volume 45 Issue 7 Pages 478-483
    Published: July 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.478
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    The effects of trace components of seawater on water content of sea-salt aerosol have been investigated by infrared spectroscopy and thermal analysis. Seawater droplets of a median diameter ca 0.35μm have been formed by atomizing an artificial seawater under ambient conditions. Humidity of the sea-salt aerosol was controlled by humidifying dried sea-salt aerosol or dehumidifying the seawater droplets. As a result, it was proven that the water content of dried sea-salt aerosol was much higher than that of NaCl aerosol due to the hydration of the trace components of seawater. In addition, the crystallization point of dried sea-salt aerosol shifted to a higher humidity than that of NaCl aerosol. The reason for this is that the crystallization of CaSO4 occurs prior to the NaCl nucleation and it leads to the heterogeneous nucleation when the water content of seawater droplets decreases.
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  • Preparation of Composite Materials of Rice Husk Powder and Synthetic Polymer by Mechanochemical Polymerization
    Mitsumasa Kimata, Hiroyuki Imano, Naoya Kotake, Masahiro Hasegawa
    2008 Volume 45 Issue 7 Pages 484-490
    Published: July 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.484
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    The mechanochemical polymerization of methyl methacrylate initiated by the grinding of rice husk powder was carried out in order to utilize natural materials more effectively as well as to reduce the environmental load. The rice husk powder was first ground with a bantam mill to a median size of around 160μm. The polymerization was performed by grinding the rice husk powder further in methyl methacrylate monomer using a vibrating ball mill. As a result, the composites of rice husk and polymethyl methacrylate were formed. The number average molecular weights of the resulting polymer were 2.7×105 to 4.4×105, which were close to those of the polymer synthesized by the conventional radical polymerization. The 1H-NMR spectra measurement revealed that the polymerization initiated by grinding the rice husk powder proceeded with radical reaction mechanism.
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  • Material Synthesis and Process Development by Means of Grinding
    Qiwu Zhang, Fumio Saito
    2008 Volume 45 Issue 7 Pages 491-501
    Published: July 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.491
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    This review paper introduces different materials and processes created and developed, respectively by means of grinding technology carried out at our lab since 1990. The technology is very simple but has shown a lot of unique phenomena in oxides and non-oxide reaction systems. We have designed a reaction map for different systems from the viewpoints of free energy change, charge valance, environmental condition, net impact energy of mill device and a like. As for the process, we have developed novel material processes for up-grading natural and artificial resources by using grinding followed by simple chemical and physical operations carried out mostly at room temperature and pressure. The materials are inorganic as well as organic (plastics and resins), and they are ground with an additive to form powder-like material, and conveyed to another chemical/physical operation to extract useful chemical species or generate pure hydrogen gas. These processes are attractive so that lots of attention has been paid from industries. Thus, grinding is a simple unit operation but it has more potential for applying to material processing and engineering than before. This technology will be utilized more and more by referring of this review article.
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  • Preparation of Fibrous Inorganic Materials via Electrospinning Method
    Kenji Iimura
    2008 Volume 45 Issue 7 Pages 502-506
    Published: July 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.502
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    Fabrication of one-dimensional structures of functional materials has been a subject of intensive research due to their unique property and potential applications. Consequently, several forms of one-dimensional nanostructures such as wire, rod, tube, ribbon and ring have been prepared from various materials. Among several fabrication methods, electrospinning seems to be the simplest, versatile and promising solution. The history and mechanism of electrospinning are reviewed in this paper. And the preparation of silica and titania/silica hybrid fibers via electrospinning is described as the example.
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  • Doctoral Thesis Introduction
    2008 Volume 45 Issue 7 Pages 519-521
    Published: July 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.519
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  • Report on Final Lecture of Professor Sunada for his Happy Retirement
    Looking Back on Wonderful 41 Years in Faculty of Pharmacy, Meijo University
    Atsuko Fukui
    2008 Volume 45 Issue 7 Pages 522-523
    Published: July 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.522
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  • Activity Report of Working Group on Particle Bonding
    Makio Naito
    2008 Volume 45 Issue 7 Pages 524
    Published: July 10, 2008
    Released on J-STAGE: May 27, 2010
    DOIhttps://doi.org/10.4164/sptj.45.524
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