Which statement is correct A. In Situation 1, the fluid viscosity is higher and

Question

Which statement is correct

A. In Situation 1, the fluid viscosity is higher and the velocity slower so that the Reynolds numbers are equal for Situations 1 and 2.

B. The Reynolds number for Situation 1 is higher than that for Situation 2.

C. The Reynolds numbers for Situations 1 and 2 are the same but the velocity U1 is lower than U2.

D. Situation 1 is for a lower Reynolds number and Situation 2 is for a higher Reynolds number.

2. The hydraulic radius, rh, for a square channel with a height and width of L and a depth of water also equal to L is

A. L

B. 3L

C. L/3

D. L/12

3. The hydraulic radius, rh, for a circular tube with diameter of D is:

A. D/4

B. D/2

C. D

D. 4D

A. In Situation 1, the fluid viscosity is higher and the velocity slower so that the Reynolds numbers are equal for Situations 1 and 2.

Explanation / Answer

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2. C

R = Area/wetted Perimeter = (LxL) /3L = L/3

3. A

R = pi D2/4(Pi.D) = D/4

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