Unformatted text preview: .‘gﬁﬁlem 5.78—Engineering Fluid Mechanics (Crowe, Elger and Robertson) A suction device 15 being designed based on the venture principle to lift objects
submerged 1n water The operating water temperature is 15‘J C. The suction cup is
located 1 m below the water surface, and the venture throat is located 1 m above the
water. The atmosphere pressure is 100 kPa. The ratio of the throat area to the exit area is
1A, and the exit area is 0.001 n12. The area of the suction cup is 0.1 1112. a. Find the velocity of the water at the exit for the maximum lift condition. 1). Find the discharge through the system for maximum lift condition. 0. Find the maximum load the suction can support PROBLEW! 5-93 Pv 15C: 1700 Pa p:999 kg/m3 Patn1=100 KPa Twate,=15° C
Ae=10'3 m2 Ah= 2 D1 A5: 0.1 m2
a) Write the Bernoulli equation ﬁom the throat to the exit of the channel. The pressure at
the throat is equal to the Pv. 1
[/6 114) A J j
J"); 4/4 3" [é .j- I; 1' .144
Also VtA =V5Ae Vrv111.111:ija Substitute the value into the Bernoulli equation written above and solve for V3. \\ We) 171» W - ., My} 444‘43‘ 7-7111 4’ Mm [544% 104—17611.
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- Fall '08
- suction cup, Crowe, maximum lift condition