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March 29, 2006, 00:15 |
Viscosity
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#1 |
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Defination of viscosty ,According to Newton's law of viscosity is,
viscosity= (Shear Stress)/(velocity gradient) It shows that for a liquid of high viscosity (like honey) velocity gradient will be very low.Is it actual situation?.I can understand this? |
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March 29, 2006, 04:20 |
Re: Viscosity
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#2 |
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Hi !!
All the liquids do not follow the Newton's law of viscosity and so known as non-Newtonian liquids. Since, most of the highly viscous fluid are non-Newtonian fluids, the velocity gradient will depend on the fluid type, whether its shear-thinning. shear-thickening, viscoelastic, time-dependent or independent etc... There are various text books available related to the rheology of fluids, including the following [1] Barnes, H.A., Hutton, J.F. and Walters, K. (1989). An Introduction to Rheology. Elsevier, Amsterdam. [2] Carreau, P.J., De Kee, D. and Chhabra, R.P. (1997). Rheology of Polymeric Systems. Hanser-Gardner: Munich, Germany. [3] Chhabra, R.P. and Richardson, J.F. (1999). Non-Newtonian Flow in the Process Industries: Fundamentals and Engineering Applications. Butterworth-Heinemann, Oxford. [4] Coussot, P. (2005). Rheometry of Pastes, Suspensions and Granular Materials: Applications in Industry and Environment. John Wiley & Sons, Inc. New York. [5] Skelland, A.H.P. (1967). Non-Newtonian Flow and Heat Transfer. Wiley, New York, USA. Best regards.... Ramp |
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