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To replace a pipe of diameter D by n parallel pipes of diameter d, the formula used is
  • a)
    d = D/n
  • b)
    d = D/n1/2
  • c)
    d = D/n3/2
  • d)
    d = D/n2/5
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
To replace a pipe of diameter D by n parallel pipes of diameter d, th...
The main pipeline divides into two or more parallel pipes, which again join together downstream.
Q = Q1 + Q2
For n parallel pipes of diameter d, d = D/n2/5
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To replace a pipe of diameter D by n parallel pipes of diameter d, th...
Replacing a Pipe with Parallel Pipes

To replace a pipe of diameter D with n parallel pipes of diameter d, the formula used is:

d = D/n^0.4

Explanation:

- The formula for the hydraulic diameter of a pipe is given by:

Dh = 4A/P

where Dh is the hydraulic diameter, A is the cross-sectional area of the pipe, and P is the wetted perimeter of the pipe. For a circular pipe, the hydraulic diameter is simply the diameter of the pipe.

- The formula for the flow rate (Q) through a pipe is given by:

Q = (π/4)D^2v

where v is the velocity of the fluid in the pipe.

- If we replace the single pipe of diameter D with n parallel pipes of diameter d, the total cross-sectional area of the parallel pipes is n times the cross-sectional area of the single pipe. Therefore, the velocity of the fluid in the parallel pipes will be n times less than the velocity in the single pipe to maintain the same flow rate (Q).

- Using the continuity equation, we can relate the velocity of the fluid to the cross-sectional area of the pipe:

Q = Av

where A is the cross-sectional area of the pipe.

- Combining the above equations, we get:

(π/4)D^2v = n(π/4)d^2(v/n)

Simplifying this equation, we get:

d = D/n^0.4

Therefore, the formula used to replace a pipe of diameter D with n parallel pipes of diameter d is:

d = D/n^0.4
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Community Answer
To replace a pipe of diameter D by n parallel pipes of diameter d, th...
The main pipeline divides into two or more parallel pipes, which again join together downstream.
Q = Q1 + Q2
For n parallel pipes of diameter d, d = D/n2/5
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To replace a pipe of diameter D by n parallel pipes of diameter d, the formula used isa)d = D/nb)d = D/n1/2c)d = D/n3/2d)d = D/n2/5Correct answer is option 'D'. Can you explain this answer?
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