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Question: a wire of diameter d 08 mm is to be...

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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 in., 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 1.0N 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: D-d The shear stress in the varnish is given bv: du dr V,F

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