Skin friction of power law fluids in turbulent flow over a flat plate

✍ Scribed by A. T. McDonald; Harry Brandt

• Publisher: American Institute of Chemical Engineers
• Year: 1966
• Tongue: English
• Weight: 442 KB
• Volume: 12
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690120406

✦ Synopsis

An onolysis is presented for skin friction of power law fluids in turbulent flow over a flat plate. A momentum balance is combined with a logarithmic velocity profile and the resulting equation is integrated. Skin friction is shown to be a function of nowNewtonian Reynolds number and power law shear rate exponent. Closed form solutions for viscous drag are obtained for some values of sheor rate exponent, but in general a numerical integration is necessary. The equations and curves presented ore valid for any power law fluid. Computations may be carried out once the fluid viscosity and shear rate exponent are known. As an example, the results are applied to a power law fluid consisting of Carbopol in water. It is shown how viscous drag is affected by changes in the polymer concentration.