The influence of adding liquids in binary mixture of granular materials on segregation mechanism

• Main Authors: Tsung-Han Tsai, 蔡宗翰
• Other Authors: Shu-San Hsiau
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/jcxyj6

碩士 === 國立中央大學 === 能源工程研究所 === 96 === The influence of adding liquids in binary mixture of granular materials on segregation mechanism was studied in this paper. The experiment facility of a vertical vibrated bed was used in this study. The granular materials consist of a binary mixture with the same volume fraction of small/heavy and large/light particles. The liquids added in the granular materials are silicon oils with five different viscosities. The ensemble average height of large particles changes with time. This controlled parameters include viscosity and dimensionless liquid content of the adding silicon oils. The liquid bridge force was greater with the increasing viscosity of the silicon oil. The increasing dimensionless liquid content of the liquid results in and stronger liquid bridges causing the higher liquid bridge force in the system. In this study, the particles in the vibrated bed display the segregation phenomenon due to the different size and density of particles. The particle motions are weaker in the system with adding more viscous or higher amount of liquid due to the stronger liquid bridge force. It results in the reduction of the segregation. The results show that the dimensionless average height of large particles and average rising velocity decrease with the increase of the viscosity and dimensionless liquid content of adding silicone oil. However segregation and the time for reaching steady state in the system decreases with the increase of the viscosity and dimensionless liquid content of adding silicone oil.