# Ratio of maximum velocity to average velocity for laminar fluid flows through two parallel plates

Q.  What is the ratio of maximum velocity to average velocity, when the fluid is passing through two parallel plates and flow is laminar?
- Published on 04 Aug 15

a. 3/2
b. 2/3
c. 4/3
d. 3/4

#### Discussion

• Mehul   -Posted on 28 Jun 19
Mr. Pankaj you are right.
U avg / Umax = 2/3
• croma    -Posted on 08 Aug 17
i think answer will need correction ratio of maximum velocity to avergae velocity for one dimensional flow will be U(max)/U(avg)= 3/2
• Pankaj   -Posted on 29 Sep 15
• Maximum velocity of fluid flowing between parallel plates is given by,

Umax = – (1 / (8 μ)) (∂p/∂x) [t2]

• Average velocity of fluid flowing between parallel plates is given by,

u = (1/12μ) (- ∂p/∂x) t2

• Ratio of maximum velocity to average velocity

Umax/ u = 3/2

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