The Effect of Mineral Solid Surface on the Water Viscosity in Boundary Layer
In mineral processing, the settling of mineral particles in water, the flow of ore pulp, the dewatering and filtering of concentrates and so on, are related to the pulp viscosity. While the interaction between mineral particle surface and water affects directly the pulp viscosity. Therefore, it is of great value to the development of mineral processing theory to research the effect of mineral particle surface on the water viscosity in boundary layer. In micro-fluid, the effect of mineral particle surface on the water molecules in boundary layer can not be ignored. The water viscosity in boundary layer and the effect of the nature of mineral particle solid surface on the viscosity are analysed based on the deduction of attraction potential energy formula of mineral particle surface to the water molecules in boundary layer. The results show that the attraction potential energy of mineral particle surface to the water molecules in boundary layer is determined by the properties of solid molecules and fluid molecules and varies inversely as the third power of the distance from mineral particle surface.The water viscosity in boundary layer consists of the viscosity of free water and the additional viscosity resulting from the attraction of mineral particle surface. The increment of the viscosity caused by the attraction of mineral surface is μs. This additional viscosity is also inverse ratio to the third power of the distance from mineral particle surface. The greater the dipole moment, the polarizability and the ionization energy of mineral particle solid surface molecules are, the higher the attraction potential energy of mineral particle surface to the water molecules and the water viscosity in boundary layer are. The thicker stationary water boundary layer is δ0. The higher the μs, is, in other words,the greater the attraction of solid surface to water molecules is, the thicker the stationary water boundary layer becomes when free water viscosity is constant.
Water viscosity in boundary layer Mineral particle surface attraction potential energy Additional viscosity Thickness of stationary water boundary layer Average viscosity
S. M. Wen H. Y. Shen
Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, China Faculty of College English, Kunming University of Science and Technology, Kunming, China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
688-696
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）