粘性泥沙悬浮液中颗粒表面滑动层厚度的计算  

The Study on slipping water layers of cohesive sediment particles

作　　者：杨铁笙[1] 熊祥忠[1] 詹秀玲[1] 杨美卿[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《水利学报》2002年第5期20-25,共6页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助课题 ( 5 99790 11)

摘　　要：根据胶体稳定性理论 ,分析粘性泥沙颗粒粘结的物理机制后指出 :应该用扩散双电层中 ζ电位相应的滑动面到颗粒表面间的水体 (滑动层 )表示束缚水层 .提出用 ζ电位测量和理论计算相结合确定滑动层厚度的方法 .针对粘性泥沙表面电势在一般情况下为负值 ,滑动面与颗粒表面距离很小 ,ζ电位绝对值相对较大的特点 ,推导改进了扩散双电层电势分布公式 ,配合滑动层厚度的计算 .以黄河花园口河滩泥沙为样品 ,在电解质(NaNO3 )不同浓度条件下测量粘性泥沙颗粒的 ζ电位 ,计算相应的滑动层厚度 ,检验本文建议的合理性和改进公式的实用性 .Based upon the electric double layer theory and analysis of flocculation mechanics an exact definition of the water layer attached on surface of fine sediment particle was proposed by means of slipping water layer corresponding to the ζ potential. A formula for calculating the electric potential distribution within the electric double layer was further deduced, and the method combining calculation of electric potential distribution and measurement of ζ potential for sediment particles was presented in detail to determine the thickness of the slipping water layer. A case study was then introduced to show the rationality of the definition and the method herein.

关 键 词：粘性泥沙 悬浮液 颗粒 表面滑动层 厚度 计算 

分 类 号：TV142[水利工程—水力学及河流动力学]