fluid machenics

Question 1

reynolds number in OCF

Answer 1

Re < 500 laminar flow

Re < 2000 turbulent flow

Question 2

most economic trapizoidal section

Answer 2

T = 4.y /sqrt(3)
A = sqrt(3) .y^2
P = 2 sqrt(3) .y
R = y /2
D = (3/4) .Y
Fr = V/ sqrt(0.75 *y.g)

Question 3

hydraulic jump classification

Answer 3

1  ~   1.7       Undular jump
1.7 ~ 2.7       Weak jump
2.7~ 4.5      Occilating jump
4.5~9.0       steady jump
     > 9.0      Strong jump

Question 4

locate meta-center of floating body

Answer 4

BM = I / Vsub
MG = I /Vsub   - BG

Question 5

Hele shaw flow

Answer 5

Laminar flow bw parallel paltes

Micro flow, low reynold number

Question 6

Hagen - poiseuille flow

Answer 6

Laminar flow in tubes

Question 7

thickness of laminar sublayer

Answer 7

V* = V .sqrt(f/8)

t= 11.6 kinamatic visc/ V*