1997 Fiscal Year Final Research Report Summary
LOW-ENERGY SLURRY TRANSPORT OF GRANULAR INDUSTRIAL WASTE MATERIALS WITH ABROASION RESISTANCE PLASTIC PIPES
| Project/Area Number |
08651109
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
資源開発工学
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| Research Institution | AKITA UNIVERSITY |
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Principal Investigator |
SATO Hiroshi AKITA UNIVERSITY,MINING COLLEGE,PROFESSOR, 鉱山学部, 教授 (00006694)
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| Co-Investigator(Kenkyū-buntansha) |
CUI Yushun AKITA UNIVERSITY,MINING COLLEGE,INSTRUCTOR, 鉱山学部, 講師 (20292360)
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| Project Period (FY) |
1996 – 1997
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| Keywords | slurry transport / granular waste materials / modified Wasp method / concentration distribution / velocity distribution / hydraulic gradient / flow pattern / kinetic friction |
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| Research Abstract |
It is economical to transport settling slully containing crushed and/or granular waste materials at the region of critical deposit velocity in a horizontal pipeline. The solids are transported as salutation or moving bed flow in which the Coulombic friction between particles and pipe wall is a very important parameter in predicting pressure gradient. This work was conducted ot clarify the characteristics and the mechanism of the solids flow in synthetic resin pipes.
The results in this study are as follows.
(1) The sliding coefficient of synthetic resin pipes is dependent on flow patterns and flow conditions of slurry transport.
(2) The scale of moving bed increases exponentially with the decrease of the velocity of slurry flow, and the relationships between the velocity of solids at the bottom of the pipes and the velocity of slurry flow are useful to determine the critical deposit velocity with threshold values of relative velocity of solids.
(3) The original software is developed for image analysis with which the flow patterns, concentration distribution, and velocity distribution of slurry in pipes are measured.
(4) The modified Wasp method is proposed for predicting the more precise hydraulic gradients of slurry flow containing various sizes of solids.
(5) A practical and convenient equation is proposed for estimating a homogeneity parameter which is one of the most essential for the determination of the flow patterns of slurry flow in pipes.
(6) Using a moving bed model, the distribution of forces operated on the inside wall of the pipe is analyzed to evaluated precise coefficients of kinetic friction of solids.
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