Chapters 8 - 9

Question 1

How to used dimensional analysis?

Answer 1

Find the variables required.
Make a general equation rating them to a generic power (alpha and beta) the tines them by a constant C.
Substitute the dimensions in (mass M, Length L & Time T)
equate all the powers of each dimension. (3 equations.)
Solve the equation to find the power.

Question 2

What are the Power coefficient and Flow coefficient in the dimensional analysis? (for pumps)

Answer 2

Kp = p / (w^2 * D^2 * rho)
p = power 
KQ = Q / (w * D^3 *)

Question 3

What are the pressure coefficient and Head coefficient in the dimensional analysis? (for pumps)

Answer 3

pressure = /\p / (w^2 * D^2 * rho)
/\p = Pressure differnecs

Kh = g*/\H / (w^2 * D^2)

Question 4

How does pump similarity work?

Answer 4

Make both equations equal to each other.

Then plug in the data given to you.