For the streamlined flow of a viscous liquid,such as water,in a capillary tube,which of the following is correct?
A)The coefficient of viscosity depends on the radius of the inside of the tube raised to the fourth power.
B)The velocity of the liquid is essentially zero at the tube walls and increases toward the center of the tube.
C)There is no pressure difference along the tube provided the tube is less than 10 cm in length.
D)The volume flow rate through the tube can never be constant.
E)None of these is correct.

Question

Quizplus · Accepted Answer

The velocity of the liquid is essentially zero at the tube walls due to the no-slip condition, and it increases towards the center of the tube. A is incorrect because the coefficient of viscosity depends on the radius of the inside of the tube raised to the first power. C is incorrect because there is a pressure difference along the tube due to the viscous resistance of the fluid. D is incorrect because the volume flow rate can be constant in a capillary tube under certain conditions.

For the Streamlined Flow of a Viscous Liquid,such as Water,in