Application of Bernoulli Equation (continued)
Example 1 (continued) Recall strategy for solution:
The
figure below shows steps 1 and 2 completed. Step 3:
P1 + ˝ ρ V12 + γ Z1 = P2
+ ˝ ρ V22 + γ
Z2 , recall ρg
= γ The
pressure gage measures “gage” pressure.
Note: “gage” pressure is
pressure relative
to atmospheric pressure. So for point
1 on the streamline: P1 = 10 psig
= 1440 lb/ft2 , Z1
= d = 5 ft, and for a “large”
tank V1 = 0 ft/sec. For
point 2 on the streamline: P2 =
0 psfg, V2 = 40 ft/sec, and Z2 = - e
= -10 ft. 1440
+ 0 + γ(5) = 0
+ ˝ (γ/g) 402 + γ(-10)
So γ =146.27 lb/ft3 Now specific gravity = sg =
γ/γwater = 146.27/62.4 =
2.34 (result) Click
here for another example. |
Copyright © 2019 Richard C. Coddington
All rights reserved.