Experimental study on the special shear thinning process of a kind of non-Newtonian fluid  

作　　者：CHEN HaoSheng CHEN DaRong WANG JiaDao LI YongJian 

机构地区：[1]State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China

出　　处：《Science China(Technological Sciences)》2007年第2期138-143,共6页中国科学（技术科学英文版）

基　　金：Supported by the Research Fund for the Doctoral Program of Higher Education (Grant No. 20030003026);the National Natural Science Foundation of China (Grant Nos. 50505020, 50475018)

摘　　要：To study the effect of long chain molecule and surface active agent on non-Newtonian fluid properties, rheological experiments on two different fluids have been done. The first group of the fluid is the hydroxyethyl cellulose water solution, and the second is the water solution containing the mixture of dodecyl- triethyl ammonium bromide and lauryl sodium sulfate. With the increasing shear rate, shear thinning phenomenon appears in the first group of solution, and a spe- cial shear thickening-shear thinning phenomenon appears in the second group. It is considered that the special rheological phenomenon is caused by the difference between the aggregating and the departing speed of the colloidal particles formed in the fluid. The difference between the two speeds relates with the shear rate. The experiment results indicate that the rheological properties can be designed by choosing proper additives at a certain shear rate, and such a fluid with special vis- cosity variation should be included in the classification of the non-Newtonian fluid.To study the effect of long chain molecule and surface active agent on non-Newtonian fluid properties, rheological experiments on two different fluids have been done. The first group of the fluid is the hydroxyethyl cellulose water solution, and the second is the water solution containing the mixture of dodecyltriethyl ammonium bromide and lauryl sodium sulfate. With the increasing shear rate, shear thinning phenomenon appears in the first group of solution, and a special shear thickening-shear thinning phenomenon appears in the second group. It is considered that the special rheological phenomenon is caused by the difference between the aggregating and the departing speed of the colloidal particles formed in the fluid. The difference between the two speeds relates with the shear rate. The experiment results indicate that the rheological properties can be designed by choosing proper additives at a certain shear rate, and such a fluid with special viscosity variation should be included in the classification of the non-Newtonian fluid.

关 键 词：non-Newtonian fluid RHEOLOGY SHEAR THINNING 

分 类 号：O373[理学—流体力学]