The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for ______________ fluid?
Correct answer: A. Newtonian
- A. Newtonian
- B. Dilatant
- C. Pseudo-plastic
Explanation
For steady laminar flow of a Newtonian fluid, the Hagen–Poiseuille relation gives Q ∝ D⁴ at fixed pressure drop and length. Since mean velocity is proportional to Q/D², velocity varies as D².
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