Unformatted text preview: riﬂe 30¢ owl/7 C I
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! P3.46 When a jet strikes an inclined fixed plate, as in
Fig. P346, it breaks into two jets at 2 and 3 of equal
velocity V = Vie, but unequal fluxes aQ at 2 and E (l  a)Q at section 3, oz being a fraction. The reason is that for frictionless ﬂow the ﬂuid can exert no tangen " tial force F, on the plate. The condition F, = 0 enables
us to solve for a. Perform this analysis, and ﬁnd a as a
function of the plate angle 6. Why doesn’t the answer
depend on the properties of the jet? The jet turns P3.6l. ocQ, V evaluate the horizontal force F required to hold the tank and falls into the tank without spilling out. If 6 = 30°,
stationary. frictionless wheels, as in Fig. P3.61 A 20°C water jet strikes a vane mounted on a tank with
In m P3.46
P3.73 A pump in a tank of water at 20°C directs a jet at 45 ft/
P351 A liquid jet of velocity V, and area Aj strikes a single 180° and 200 gal /min against a vane, as shown in Fig. 133.73
bucket on a turbine wheel rotating at angular velocity 9’ Compute the force F to hold the cart stationary if the je
as in Fig. P351. Derive an expression for the power P follows (a) path A or (b) path B. The tank holds 550 ga
delivered to this wheel at this instant as a function of the of water at this instant. system parameters. At what angular velocity is the maxi
mum power delivered? How would your analysis differ if
there were many, many buckets on the wheel, so that the
jet was continually striking at least one bucket? 4—— B ucket , r Jet l Wheel, radius R P351 P3.73 :3 P349 The horizontal nozzle in Fig. P3.49 has D1 = 12 in and
D2 = 6 in, with inlet pressure pI = 38 lbf/inzabsolute and
V; = 56 ft/s. For water at 20°C, compute the horizontal
force provided by the ﬂange bolts to hold the nozzle ﬁxed. P3.49 ...
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 Fall '08
 Schwartz,L

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