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**Unformatted text preview: **—-‘r1rv"vv'w' 'v‘v‘ 11"-ww'vvvvvvvvvvvvvvvvjvv 1. WATER b) the velocity at section 1 (p1 = 800 kPa), when cavitation occurs and the location of If the pressure at ‘A’ is 125 kPa (a), what is the pressure at ’B’? In the venturi shown below, determine: a) the mass ﬂow rate, the ﬂuid pressure and velocity at section 2; cavitation if the water temperature is 40°C. Cavitation is local boiling where the pressure
is below the ﬂuid vapour pressure. “11m _ “up mm- mm ﬂﬁﬂvu’unu «x2 mamﬁxrrsamwejw 3. Calculate the ideal volume ﬂowrate of the unknown liquid in the pipeline. Water is discharging to atmospheric pressure through the nozzle shown below. Measurements at
sections 1 and 2 indicate: p1 = 100 psig p2 = 1 atm
V1=ll.llft/s V2=100ftls
d1 = 6 in (12 2 2 in
a) Find the force required by the ﬂange at section 1 to hold the nozzle in position in terms of V1, V2, p1 and p2.
b) Find the above force in lbf. (3) Are the velocities V1 and V2, and the pressures p1 and p2 consistent with frictionless
ﬂow? Determine the pumping power required to achieve the indicated ﬂow characteristics. val: —-—9 Water
Q‘ .25 "9/5 p-OTIM Poigl
—-> A Canadair CL215 water bomber aircraft picks up its load of 1200 Imp. gallons of water by ﬂying
at a negligible height above the surface of a lake with a 5000p submerged just below the surface. a) Find the extra drag force ("momentum drag") imposed on the aircraft by the water pick—up
if the aircraft is loaded in 30 seconds while ﬂying at 118 knots. b) Find the extra power needed for the pick—up.
c) Find the energy given to the water load as seen by a stationary observer on the ground.
(1) Show that half of this energy is in the form of kinetic energy and identify the form in which the remainder of the energy is stored and the means by which it was transformed. 1 knot : 1 nautical mile/hr: 1.689 W5
1 Imp. gallon = 10 lbm of water it A ﬁre hose is very ﬂexible and when water is ﬂowing through the nozzle ﬁreﬁghters must hold
against the "kick". If the exit velocity of the water is 90 his, determine the magnitude and
direction of the x and y force components required to brace the nozzle. NOTE: Since the hose is ﬂexible, it cannot bear any transverse load, i.e. any force exerted by the
hose must be parallel to it. .Y l in dia JET A two dimensional body is mounted in a water tunnel as shown below. The channel is 2 feet wide
and 6 inches high. The velocity and pressure well upstream of the body are 10 his and 3 psia
respectively. Downstream of the body a very long cavity forms. The pressure in the cavity is
0.5 .psia and the density in it can be neglected. Neglecting friction and gravitational effects,
calculate the force necessary to hold the body in place. ...

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- Winter '13
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