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Kenji Kofu, Mitsuaki Ochi, Masahiro Takei, Yasuhiro Hirai2009 Volume 46 Issue 12 Pages 858-864
Published: December 10, 2009
Released on J-STAGE: January 30, 2010
JOURNAL FREE ACCESSUltrasonic has been applied to dense-phase low-speed transportation, called plug transportation, in horizontal pipes, and the friction reduction effect has been investigated by using four types of particles in a pipe 50 mm in diameter. In this paper, it was confirmed that the friction between the particles and pipe wall and the pressure drop are reduced as the application of ultrasonic increases. It was also shown that this reduction effect becomes small as the air mass flow rate becomes large, and the friction reduction can be predicted calculably. Additionally, in order to apply ultrasonic for pipelines, the connection method of a vibration pipe that can prevent air leakage and does not reduce the amplitude of the vibration pipe, was proposed. As a result, this method can be applied for pipe pressures under 56 kPa.View full abstractDownload PDF (751K) -
Junichi Noma, Hiroya Abe, Kentaro Yamamoto, Manabu Tanaka, Makio Naito2009 Volume 46 Issue 12 Pages 865-872
Published: December 10, 2009
Released on J-STAGE: January 30, 2010
JOURNAL FREE ACCESSFe nanoparticles were prepared by DC arc plasma method under Ar, Ar-25%H2, Ar-50%H2, Ar-75%H2 and H2 flow. The diameter of arc plasma decreased significantly with increasing H2 mixing ratio, which was due to hydrogen induced thermal pinch effect. The generation rate of the Fe nanoparticles was significantly enhanced with the pinched arc plasmas. The numerical simulation with taking into consideration of Fe vaporization was carried out, and it was indicated that the arc temperature drastically increased due to the thermal pinch effect, and thereby Fe anode was efficiently heated, leading to the enhancement of Fe vaporization. Thus, the thermal pinch effect plays an important role on the generation rate of metallic nanoparticles in Ar-H2 arc plasma method.View full abstractDownload PDF (1315K) -
Kazuki Asai, Masaaki Ichiyanagi, Hiroshi Satone, Takamasa Mori, JunIch ...2009 Volume 46 Issue 12 Pages 873-880
Published: December 10, 2009
Released on J-STAGE: January 30, 2010
JOURNAL FREE ACCESSThe measured values of apparent viscosity of non-Newtonian fluids were discussed. Alumina slurries, CMC solutions and chocolates were used as non-Newtonian fluids, and their apparent viscosities were measured by a single cylinder rotational viscometer (B-type viscometer) and coaxial cylinder rotational viscometer (coaxial viscometer). The measured values by the B-type viscometer were larger than those by the coaxial viscometer in every sample, and the flow curves measured by the coaxial viscometer were well fitted by the power law model. The ratio of the apparent viscosities measured by both viscometers was correlated with the exponent in the power law model. Instead of the exponent, a new index defined by the measurement values of the B-type viscometer was proposed in order to estimate the true values measured by the coaxial viscometer. The ratio of the apparent viscosities could be correlated with the new index as well as the exponent. It has been revealed that the true apparent viscosity can be roughly estimated by the B-type viscometer by using the new index.View full abstractDownload PDF (868K)
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Hisanori Sensaki2009 Volume 46 Issue 12 Pages 881-886
Published: December 10, 2009
Released on J-STAGE: August 31, 2017
JOURNAL RESTRICTED ACCESSWe tried to study on the possibility to apply the dichloromethane （DCM）-degrading bacteria as bioreactor in order to decompose the DCM used in manufacturing process.
Using the samples that collected at 16 places in the environment, the isolation of DCM-degrading bacteria was performed in the media in which included DCM as the single carbon source. Consequently, 14 bacterial strains with high DCM- degrading ability were observed. As a results of identification based on 16S-rDNA gene analyses, all of these strains were identified as Hyphomicrobium sp. belonging to the group "methylotroph". The small experimental apparatus was designed and it was filled with DCM-degrading bacteria adhered on the polypropylene support plates. Using the closed system apparatus and representative bacteria strain, S-1, DCM degradable ability was evaluated in the circulation of DCM aqueous solution supplemented with the nutrient salts. In consequence, DCM solution was completely degraded up to 500 mg/l DCM concentration in 10hours and it showed good degradable ability corresponding ca 1mg/unit/h. In addition, we confirmed that DCM in the manufacturing waste solution （e.g. seal water from vacuum pump, extracted aqueous layer） was also degradated in this apparatus similarly, without any problem.
Furthermore, it was confirmed that in the coexistence of other bacteria than Hyphomicrobium sp. degradation of DCM was performed similarly as in Hyphomicrobium sp. alone, if DCM is supplied sufficiently.
This study showed the promising results concerning to the application of bioreactor to degrade DCM by using the isolated bacteria.View full abstractDownload PDF (1530K)
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