The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is__________________?
Correct answer: D. Parabolic near the wall and flat in the middle
- A. Parabolic
- B. Flat
- C. Flat near the wall and parabolic in the middle
- D. Parabolic near the wall and flat in the middle
Explanation
A Bingham plastic fluid has a yield stress, producing an unsheared plug in the central region where velocity is nearly flat. Shearing occurs near the wall, giving a curved profile there, so the profile is parabolic near the wall and flat in the middle.
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