A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, η0 = 10 KPa, is shared between flat parallel plates separated by a distance of 10-3 m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is________________?
Correct answer: B. 20 KPa
- A. 10 KPa
- B. 20 KPa
- C. 30 KPa
- D. 40 KPa
Explanation
For a Bingham fluid, wall stress equals yield stress plus viscous stress: τ = τ₀ + μ(du/dy). Here du/dy = 1/10⁻³ = 1000 s⁻¹, so τ = 10 + 10 = 20 kPa.
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