Discussion
A single cell of enclosed area \( 0.45 \) m\( ^2 \) is replaced by one of \( 0.90 \) m\( ^2 \) at the same torque. The shear flow becomes
Answer: B
Shear flow varies inversely with the enclosed area, so doubling the area halves the flow. Enlarging the cell is therefore a far more effective way of reducing shear stress than thickening the walls, though it is usually constrained by the aerofoil shape.
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