EFFECT OF DIFFERENT CONCENTRATIONS OF POWER LAW NONNEWTONIAN LIQUIDS ON THEIR CRITICAL TURBIDITY AND RHEOLOGY

Abstract

The turbidity of liquid is very important in high speed camera applications used to record the movement of accelerated solid spherical particles with rotation falling in Newtonian and non – Newtonian liquids. Measurements of turbidity, density, apparent viscosity and fluid rheological properties (flow behavior index n & consistency index K) were taken for different concentrations (0.15, 0.2, 0.25, 0.3 and 0 .4) % w/v of Carboxy methyl Cellulose (CMC), poly – vinyl alcohol (PVA) and CMC – PVA. Two types of CMC were used (industrial and laboratorial products). The results show that laboratorial CMC is the least turbidity (more transparent) than PVA and industrial CMC, PVA is less turbidity than industrial CMC and adding 0.5 gm of PVA to laboratorial CMC for the first three concentrations decreases the apparent viscosity and increase turbidity, while the apparent viscosity and turbidity were increased for the last two concentrations. The rheological properties of industrial CMC were unmeasurable because of the vibrational and unsteady records when they were measured by the viscometer. Different water turbidities were used to determine the critical turbidity suitable for this study which was 17.6 NTU and the corresponding critical concentrations were (0.25, 0.4, 2.25, 2.4 and 2.7) % w/v for (industrial. CMC + 0.5 gm PVA, industrial CMC, laboratorial CMC + 0.5 gm PVA, PVA and laboratorial CMC) respectively.