HW6solf10 - Homework #6 Solutions 1. Viscosity is the slope...

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Homework #6 Solutions 1. Viscosity is the slope of the stress versus strain rate curve. For Newtonian fluid the viscosity is constant, so the slope is constant, which means it is a straight line. For pseudoplastic fluids the slope decreases, and for dilatant fluids the slope increases. This is shown in the graph below: 2. The decrease in molecular weight will cause a decrease in viscosity. This seems as if it would be like a thixotropic fluid. However, for a thixotropic fluid the viscosity decrease is reversible; once you stop the shear flow the viscosity goes back up to its original value. For degradation, however, the decrease in viscosity is permanent; decreasing molecular weight is caused by breaking covalent bonds, which can not be reversed. 3. Compare the viscosity at 230º C and 231º C to get the percent change: ( ) ( ) ( )( ) ( )( ) 95 . 0 K 503 K mol / J 314 . 8 mol / J 10 x 104 exp K 504 K mol / J 314 . 8 mol / J 10 x 104 exp K 503 R E exp A K 504 R E exp A RT E exp A 3 3 a a 230
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HW6solf10 - Homework #6 Solutions 1. Viscosity is the slope...

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