Viscosity–Concentration Equation for Emulsions of Nearly Spherical Droplets

✍ Scribed by Rajinder Pal

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 124 KB
• Volume: 231
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.2000.7133

✦ Synopsis

A new modified form of the equation of N. Phan-Thien and D. C. Pham (J. Non-Newtonian Fluid Mech. 72, 305 (1997)) is proposed to describe the viscosity-concentration behavior of emulsions of nearly spherical droplets. The proposed equation, as well as other existing theoretical equations, is evaluated in light of a large body of experimental data on concentrated emulsions, covering a broad range of dispersed-phase to continuous-phase viscosity ratios (4.15 × 10 -3 to 1.17 × 10 3 ). In general, the experimental data exhibit large deviations from the existing theoretical equations; for example, the theoretical equation of Phan-Thien and Pham underpredicts the relative viscosity of concentrated emulsions by a large amount. The equation proposed in this work describes the experimental viscosity data of different emulsion systems remarkably well.