The thickness of a layer of a power law fluid on a sheet, which is withdrawn from a bath, is determined for the three regimes of withdrawal conditions. The flux in viscous withdrawal is, like for a newtonian liquid, lower than the maximum possible flux on a sheet moving upwards with a certain veloci
Withdrawal of flat plates from power law fluids
β Scribed by John A. Tallmadge
- Publisher
- American Institute of Chemical Engineers
- Year
- 1970
- Tongue
- English
- Weight
- 565 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0001-1541
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β¦ Synopsis
Abstract
A new oneβterm withdrawal expression for power law fluids is developed from theoretical equations. Comparison with film thickness data for three carbopol fluids of Ξ± = 1.79 to 2.68 indicates agreement similar to that observed with valid Newtonian theories. The agreement was verified by comparison with independent measurements of entrainment flow rate.
π SIMILAR VOLUMES
A new theory for withdrawal of flat plates from power law fluids has been developed and tested with film thickness data. The theory was found to be superior to previous theories. Agreement between theory and data was found to be sensitive to the relevant curvature coefficient. Properties of the vari
An analysis for withdrawal of cylinders from power law fluids has been presented for predicting the withdrawal speed for a desired film thickness. The theory has been compared with the previously published photographic and flow rate data of a low viscous Newtonian fluid for three values of No0 and s
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