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Title :沈降法による微小粒子の粒径測定について
Title alternative :On the Measurement of Small Particle Size by Sedimentation
Authors :長谷川, 富市
塩原, 春樹
鳴海, 敬倫
Publisher :日本機械学会
Issue Date :Jan-1988
Journal Title :日本機械学会論文集. B編
Volume :54
Issue :497
Start Page :119
End Page :124
ISSN :0387-5016
Description :Sedimentation of small particles through liquid has been widely utilized to measure easily the size of the particles. Conserning this, experiments were carried out both for the case of a single particle falling through liquids and for the case where particles constitute a dispersion system and fall through liquids, and the following are clarified : (1) Drag coefficients measured on a single particle are approximately expressed with Stokes' law for creeping flow motion. (2) With sedimentation of dispersed particles, the falling velocity is in some cases abnormally low, though the concentration of the dispersion system used is hitherto thought to be too low to induce interaction among the suspended particles. (3) The abnomally low sedimentation speed is possibly due to the interaction among the suspended particles which are surrounded with electric double layers. (4) To suppress the occurrence of the abnomally low sedimentation speed and no measure the nearly correct size of particles, it is effective to add NaCl of the order of 1 mol/1 to the water of dispersion medium.
Keywords :Sedimentation
Small Particles
Low Reynolds Number
Electric Double Layer
Type Local :学術雑誌論文
Language :jpn
URI :http://hdl.handle.net/10191/5723
fullTextURL :http://dspace.lib.niigata-u.ac.jp/dspace/bitstream/10191/5723/1/9_0021.pdf
Relation :http://ci.nii.ac.jp/naid/110002401165
Rights :日本機械学会
Appears in Collections:10 査読済論文 = Postprint

Please use this identifier to cite or link to this item: http://hdl.handle.net/10191/5723