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Q#1
GATE CH 2020
MCQ
+2 marks
-0.66 marks
A student performs a flow experiment with Bingham plastic under fully developed laminar flow conditions in a tube of radius 0.01 m with a pressure drop (ΔP ) of 10 kPa over tube length (L) of 1.0 m .The elocity profile is flat for r < rc and parabolic for r ≥ rc , as shown in the figure.
Consider r and x as the radial and axial directions, and the shear stress is finite as r approaches zero. A force balance results in the following equation
Where τrx is the shear stress. If rc is 0.001 m , then the magnitude of yield stress for this Bingham Plastic (in Pa) is
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