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4. | What is the shear rate at the pipe wall, in case of laminar flow of Newtonian fluids in a pipe of diameter �D� & length �L� incurring a pressure drop �?p� with average velocity �Vavg� ? | |
A. | D ?p/8L | |
B. | D ?p/4L | |
C. | 8 Vavg/D | |
D. | 4 Vavg/D | |