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Volume 26, Issue 3
Displaying 1-5 of 5 articles from this issue
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Special Issue: Articles for 25th anniversary (1)
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Nobuyuki TAKENAKA2012 Volume 26 Issue 3 Pages 262-265
Published: September 15, 2012
Released on J-STAGE: October 24, 2012
JOURNAL FREE ACCESSDownload PDF (1305K) -
(Development of Two-phase Flow Analysis Codes for Reactor Design)Hajime AKIMOTO2012 Volume 26 Issue 3 Pages 266-272
Published: September 15, 2012
Released on J-STAGE: October 24, 2012
JOURNAL FREE ACCESSResearch and development activities for two-phase analysis codes for nuclear reactor design and safety analyses have been reviewed focusing in recent twenty five years. For reactor safety evaluation, large-scale tests were performed to confirm effectiveness of ECCS in 1980's and 1990's. These test results were succeeded to so-called best-estimate codes such as RELAP5 , TRAC codes. Severe accident researches were performed in 1980's and 1990's and accident management methods were studied. Detailed simulation methods such as subchannel analysis, multi-dimensional analyses have been developed based on test results and computational technology enhancement in 1990's and 2000's. Future scope is summarized briefly.View full abstractDownload PDF (1173K) -
Kohji MICHIOKU2012 Volume 26 Issue 3 Pages 273-284
Published: September 15, 2012
Released on J-STAGE: October 24, 2012
JOURNAL FREE ACCESSA paradigm for river management was shifted after a legal reform of the river act in 1997, where preservation and mitigation of natural environment became an essential engineering issue in addition to flood control and water use. After then, multi-phase flow researches in river engineering have tremendously changed their direction from hydrodynamics to ecohydraulics that is an integrated engineering disciplines consisting of hydraulics, ecology and biochemistry. Hydraulic engineers are required to develop engineering management tools of river ecosystem that is one of most critical issues for our sustainable life in the next era. There is a wide range of hydraulic engineering disciplines that are closely related multi-phase flows found in issues from disaster mitigation to preservation of nature. In this article, hydraulic engineering researches in the last decades are briefly overviewed focusing on multi-phase flows in a river system.View full abstractDownload PDF (1468K) -
Kuniomi ASAKURA2012 Volume 26 Issue 3 Pages 285-291
Published: September 15, 2012
Released on J-STAGE: October 24, 2012
JOURNAL FREE ACCESSSlurry and paste (highly concentrated slurry) transportation in mining industry are overviewed. In the case of slurry, three types of trends are noticeable. Firstly, long and large capacity pipelines have been constructed to transport concentrates of various ores. Secondly, to protect pipelines from abrasion and corrosion, newly constructed pipelines are lined with high-density polyethylene (HDPE). Thirdly, pipelines from mines at high elevation over 4,000 m have been constructed. These pipelines are controlled by state of art technologies to prevent slack flow and over-pressure.
Paste technology in mining industry is getting popular all over the world. At early stage of the paste technology, mining engineers paid attention to use this technology for back filling inside mines. Recently this technology is applied to surface disposal of paste without using conventional dams or pondsView full abstractDownload PDF (1682K)
Papers:
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(Influence of Inner Diameter and Geometry of Mixer)Takeyuki AMI, Kohei AWATA, Hisashi UMEKAWA, Mamoru OZAWA2012 Volume 26 Issue 3 Pages 302-311
Published: September 15, 2012
Released on J-STAGE: October 24, 2012
JOURNAL FREE ACCESSImmiscible two components flow is widely observed in several engineering equipments such as pipeline, μ-TAS and so on, and it has been also utilized as the simulation of the two-phase flow under high pressure conditions. However, the knowledge of fluid characteristics in mini-channel is still not enough, especially the influence of the methods of the mixing is not clear. In order to clarify the flow characteristic of oil-water mixture in horizontal mini-channels, the experimental investigation was conducted by using a forced convective flow system with two different mixers with two mixing manners. The test section was made of glass tube with 0.53mm and 2.09 mm in inner diameter. As the experimental results, the several flow patterns were identified and flow pattern transition was correlated by using Weber number of each phase. The pressure drop for 2.09 mm took the characteristics of ordinary tube, while 0.53 mm took the typical characteristics of capillary tube. The obtained pressure drop showed a good agreement with Lockhart-Martinelli correlation.View full abstractDownload PDF (1707K)
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