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1 Vol. 8 (25 8 ) LAT PIV Development of LAT PIV Visualization Technique for Particle Fluid System Hidetaka SAOMOTO, Takashi MATSUSHIMA and Yasuo YAMADA Mechanical behavior of particle-fluid systems is extensively studied in various engineering field such as geotechnical engineering, mechanical engineering and powder technology. Although observation of complicated behaviors including interaction between particles and pore fluid is essential, very few efficient techniques are available for this purpose. From this point of view an observation technique based on LAT(Laser-Aided Tomography) and PIV(Particle Image Velocimetry) was developed and applied to the permeability experiments involving a seepage failure. The LAT PIV technique enables us to visualize not only the particle motion but also the pore fluid motion and evaluate them quantitatively. Key Words : Visualization, LAT PIV, Particle Fluid System 1. MRI X X Otani 1) Kiyama 2) X 3) X MRI Ogawa 4) MRI Matsui 5) ( ) PIV(Particle Image Velocimetry) PIV Sakakibara 6) PIV LAT(Laser-Aided Tomography) 7),8),9) PIV LAT PIV LAT PIV 1

4 ) ( 752nm) 5FPS CCD (REDLAKE Motionpro) CCD 6G PIV 1) 3.

2 2. LAT PIV LAT PIV LAT PIV LAT Konagai 7) 8) 9) LAT 2 ( HIVAC-F-4 KF-56) 2:5 PIV ( ) ( 1) LAT PIV ( 2) 2 2 LAT PIV 58-GSS-35 Nd:YVO 4 ) ( 752nm) 5FPS CCD (REDLAKE Motionpro) CCD 6G PIV 1) PC CCD 1 LAT PIV (MELLES GRIOT () () 3 ( 1mm 1mm 4mm) ( ) 2 (SSK P28 1) 2

3 6mm 1mm 3mm 3mm P 2mm 3 1mm 1mm 2mm 5mm 2mm 1 1.2g/cm 3 4µm 2 2 FPS shutter speed(s) No /48 No /7 No /875 No /8 No /75 No /75 No /75 No /75 No /8 No /8 No /8 No /8 No /5 No /5 No /5 No /5 No /5 No /5 No /5 No /5 1 (g/cm 3 ) (mm) 2 5 (mm 2 /s) mm CCD mm/pixel 54pixel(29.86mm) 48pixel(26.54mm) (mm/s) 14 No No.8 (i=.347) 4 No.1 (i=.3) 2 No.14 (i=.712)

.7 e Gs ((Gs 1)/(1+e)).78.92 7.68 1 1 cm/s (Hazen Taylor ) Darcy Ergun 11) /(1 ) 2 Ergun Ergun Ergun i = 15µ(1 ε)2 1.75(1 ε) v + ρg(φd m ) 2 ε3 g(φd m )ε 3 v2 (1) i v ρ µ 15 1.

4 .7 e Gs ((Gs 1)/(1+e)) cm/s (Hazen Taylor ) Darcy Ergun 11) /(1 ) 2 Ergun Ergun Ergun i = 15µ(1 ε)2 1.75(1 ε) v + ρg(φd m ) 2 ε3 g(φd m )ε 3 v2 (1) i v ρ µ Hazen Taylor ( ) ε φ d m φ (crushed glass=.65 rounded sand=.83 12)13) ) Ergun φ cm/s cm/s Ergun 1 Ergun (mm/s) φ=.74 φ=.6 φ= Ergun No.1(.3) CCD PIV ( ) 6 33msec ( mm) ( mm/s) 33 33pixel(1.82mm ) 6 No.1 33msec 4

6 6 ( 7 8) (mm/s) 6 5 4 3 2 1.2.4.6.8 1 9 7 No.8 4msec 8 No.

14 ( 1 2) 1 1 (1 1 1 t 18 t: 1-11 9-11 8-12 7-13 6-14 5-15

5 6 6 ( 7 8) (mm/s) No.8 4msec 8 No.14 2msec No.1 No.14 ( 7885 ) 9.2 2% CCD ( ) No.14 ( 1 2) 1 1 (1 1 1 t 18 t: ) 4.36mm/s( 4.25mm/s) (5.31mm/s) 1 No.1 No.8 No.14 ( ) (7885 ) 5

6 / No.1 No.8 No / () 1 5 1mm ( ) No.2 No.2 2 (.4 ), 1/5 11 2mm x 25mm (mm/s) (s) 12 () mm/s (12.26mm/s)

7 3 6mm/s mm/s 15 4mm/s mm/s 35 y (mm) x (mm) 14 A B 24 8 (mm/s) (=1 ) (s) 13 (deg.) 7 A B (s) 15 A B 4.4 PIV LAT GUI 1) 11 A B A B ( A..4 B.12.4 ) 14.4 A B A 1 B 8 A B A B A A ( 15) A B

8 5. LAT PIV 1. Ergun 2. / PIV 1) J.Otani: State of the art report on geotechnical X-ray CT research at Kumamoto University, International Workshop on X-ray CT for Geomaterials - GeoX23 - pp.37-69, 23. 2) Kiyama,S., Aoyama,S.: Microscopic Investigation from Crack Propagation to Shear Band of a Gravel Soil at Uniaxial Compression by CT Image, International Workshop on X-ray CT for Geomaterials - GeoX23 - pp.37-69, 23. 3),, :,,Vol.3,pp ,2. 4) Kuniyasu Ogawa,Takeshi Matsuka,Shunichiro Hirai and Ken Okazaki: Three-dimensional velocity measurement of complex interstitial flows through watersaturated porous media by the tagging method in the MRI technique,meas.sci. Technol,12,pp ,21. 5) Matsui,G. et al: Flow Characteristics in Channel with Local Blockage Packed with Spheres,5th World Conference on Experimental Heat Transfer, Fluid Mechanics, and Thermodynamics,pp.24-28,21. 6) Sakakibara, J., Nakagawa, M., Yoshida, M.: Stereo- PIV study of flow around a maneuvering fish, Experiments in Fluids, 24. 7) Konagai,K.,Tamura,C.,Rangelow,P.and Matsushima,T.: Laser-Aided Tomography:A Tool for Visualization of Changes in the Fabric of Granular Assemblage, Structual EngineeringEarthquake Engineering Vol.9, No.3 pp JSCE ) : LAT 3 6 pp ) Matsushima,T., Saomoto,H., Tsubokawa,Y., Yamada,Y.: Grain Rotation versus Continuum Rotation during Shear Deformation of Granular Assembly, Soils&Foundations, Vol.43, No.4, pp.95-16, 23. 1) : 24 11) SABRI ERGUN : Fluid Flow Through Paked columns Chemical Engineering Progress Vol.48 No.2 pp ) McCabe,Smith and Harriott: Unit Operations of Chemical Engineering,Mcgraw-Hill,2. 13) R.H. Perry,D.W. Green,J.O. Maloney: Perry s Chemical Engineers Handbook,Mcgraw-Hill, ) Nian-Sheng Cheng: Application of Ergun Equation to Computation of Critical Shear Velocity Subjected to Seepage, Journal of Irrigation and Drainage Engineering,ASCE.129(4), pp ,23. 15) M. C.E. J. ( ): PIV 2. ( ) 8

第６２巻　第１号　平成２４年４月／石こうを用いた木材ペレット

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