Discussion
Rheological diagram of different types of fluids is shown in figure. Column I represents the nature of the fluid and column II represents the curve showing the variation of shear stress against shear strain rate.
| Column I | Column II |
|---|---|
| (i) Newtonian | M |
| (ii) Shear thinning | N |
| (iii) Shear thickening | O |
| (iv) Bingham plastic | P |
The most appropriate match between columns I and II is,
Answer: B
The match is (i) - O; (ii) - P; (iii) - N; (iv) - M.
- A Newtonian fluid has shear stress proportional to strain rate: a straight line through the origin, curve O.
- A shear-thinning fluid's apparent viscosity falls as the rate rises, so the curve bends down towards the rate axis: P.
- A shear-thickening fluid's viscosity rises with rate, so its curve bends upward: N.
- A Bingham plastic does not flow until a yield stress is exceeded, then behaves linearly: a straight line starting above the origin, M.
Options pairing Newtonian with P, or Bingham plastic with N, put a curved line where a straight one is needed, and the first option swaps thinning and thickening.
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