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Question: fluid mechanics question...

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Fluid Mechanics Question:

6. A wire of diameter d- 0.8 mm is to be coated with varnish for insulation by drawing it through a circular die of diameter D 0.9 , as shown below. The wire is centered in the die, and the varnish completely fills the space between the wire and the die for a length L- 20 mm. A force of 1.0 N is required to draw the wire through the die at a speed of V 50 m/s. Assume the following velocity profile in the varnish: u202-r) D-d The shear stress in the varnish is given by: du dr Determine the viscosity u (Ns/m2) of the varnish. VF

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