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Influence of temperature and shear rate on rheological properties of CTAC/NaSal aqueous solution

Author(s):

Mingjun Pang* and Chengcheng Xie  

Abstract:


It is very important for understanding the turbulence drag-reducing mechanism and improving product quality in the fields of pharmaceutical and chemical engineering to deeply investigate rheological properties of surfactants solutions. The rheological properties of Cationic surfactant (Cetyltrimethyl Ammonium Chloride)/Sodium salicylate were measured and analyzed with the MCR302 rheometer. It was investigated in detail on the influence of shear time, shear rate and temperature on the apparent viscosity of solutions. The present results show that the change of shear viscosity of CTAC/NaSal solutions with time can be divided into four stages. Under the certain condition (such as C=0.6250mmol•L-1, γ=150s-1 and 200s-1), the viscosity curves show the double-thickening phenomenon. Induction time (Tind) decreases with the increase of shear rate but increases with the increase of concentration. When the shear rate exceeds 60s-1, Tind is only related to shear rate. The flow curve of CTAC/NaSal solutions can be divided into three regions in dual-logarithm coordinates system with the increase of shear rate. The relationship between the shear stress and the shear rate roughly conforms to the law of linear function

Keywords:

surfactant, rheological properties, shear rate, temperature

Affiliation:

School of Mechanical Engineering, Changzhou University, Changzhou, Jiangsu, School of Mechanical Engineering, Changzhou University, Changzhou, Jiangsu



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