Deck 9: Compressible Flow

Question 1

$\text {Water flows over a flat plate so that at }$$\text {the downstream end it has the velocity}$ $\text {profile shown. The average velocity\(\bar { v }\)}$ $\text {across the upper horizontal surface is }$$\text {nearest:}$

A) 0.043 m/s
B) 0.067 m/s
C) 0.082 m/s
D) 0.097 m/s

Answer 1

0.043 m/s

Question 2

The exit velocity is 12 m/s. The inlet velocity of the water is

A) 6.31 m/s
B) 4.32 m/s nearest:

C) 3.95 m/s
D) 3.24 m/s

Answer 2

4.32 m/s nearest:

Question 3

$\text {Water flows into and out of the tank. If \(V = 8 \mathrm {~m} / \mathrm { s }\) and}$ $Q = 0.02 \mathrm {~m} ^ { 3 } / \mathrm { s }$ , $\text {the mass flux is nearest:}$

A) 6 kg/s
B) 8 kg/s
C) 10 kg/s
D) 12 kg/s

Answer 3

10 kg/s

Question 4

$\text {A stratified liquid flows in a \(80 - \mathrm { cm }\)-wide, 40 -cm-high channel with the density distribution }$$\rho ( y ) = 800 ( 1 + 0.2 y ) \mathrm { kg } / \mathrm { m } ^ { 3 }$ $\text {and a uniform velocity distribution of \(1.2 \mathrm {~m} / \mathrm { s }\), with \(y\) measured}$$\text { from the bottom of the channel. The mass flux is nearest:}$
(A) $260 \mathrm {~kg} / \mathrm { s }$
(B) $280 \mathrm {~kg} / \mathrm { s }$
(C) $300 \mathrm {~kg} / \mathrm { s }$
(D) $320 \mathrm {~kg} / \mathrm { s }$