earticle

영어

Sedimentation characteristics in the seawater of various type particles imitating coagulated spherical particles were examined. The sedimentation characteristics in laminar flow were performed using a glass column with height of 130cm, and diameter of 30cm. And the sedimentation analysis in turbulent flow was performed in the water tank with volume of 2.8m3. Experimental value and theoretical sedimentation rate by Stoke's law in case of using one spherical particle in laminar flow was similar. However, more cohesive particles indicated much distortion degree by increasing of vertical sedimentation cross section. It could be considered that the distortion degree of sedimentation rate was greatly influenced by particle types. When the artificial wave was given, the particle was precipitated in the form of parabolic orbit. The theoretical sedimentation rate of one spherical particle by Newton's law was showed ten-folds high of experimental value comparing with other various types of particles. According to the morphology of cohesive particles, although the distortion degree of sedimentation rate showed similar tendency in laminar and turbulent flow, the distortion degree was slightly lower in turbulent flow due to laminar flow.