Predicting the Striation Thickness in a Couette Flow System - Shear Thinning Model

2 Predicting the Striation Thickness in a Couette Flow System — Shear Thinning Model 

For this problem, we will consider a Couette device, schematically represented in Fig. 6.46 in which the inner cylinder rotates at a speed Cl and with a secondary component made up of a black tracer line with an initial thickness S0. As the tracer line is deformed, it spirals 

Using the notation described in Fig. 6.46 and the solution presented for Couette flow in Chapter 4, we write 

After N revolutions, the length will be NdO and the total length of the tracer line will be 

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