Shear stability studies on polymer-polymer and polymer-fibre mixtures |
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| Authors: | J P Malhotra P N Chaturvedi R P Singh |
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| Institution: | (1) Department of Aeronautical Engineering, Indian Institute of Technology, 721302 Kharagpur, India;(2) Materials Science Centre, Indian Institute of Technology, 721302 Kharagpur, India |
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| Abstract: | The shear stability of drag reducing polymer-polymer and polymer-fibre mixtures has been studied at a Reynolds number of 14,000 using a turbulent flow rheometer. The ratio of the drag reduction at a particular pass number to the initial drag reduction has been determined for the mixtures at various pass numbers and compositions in order to determine the effect of composition on the shear stability of the mixtures.It has been found in both cases that when there is a drastic difference in the shear stabilities of the constituents of the mixtures, the incorporation of a small amount of the less shear stable drag reducing agent reduces the shear stability drastically. On the other hand, when the shear stability of the constituents are of the same order, there is only a proportional change in the shear stability of the mixtures on addition of one component to the other. A correlation between the decay coefficient of the mixture (R
M
), the decay coefficients of the constituents (R
1
andR
2
) and the weight fractions of the mixture components (W
1 andW
2) is suggested. An efficacious method for preparing asbestos fibre stock suspensions is also described. |
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| Keywords: | Turbulent drag reduction shear stability polymer-polymer mixture polymer-fibre mixture decay coefficient |
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