Exam2_Sol - Name ME 332 Spring 2009 Exam 2 Problem 1(50...

Name:________________________
ME 332, Spring 2009
Exam 2
Problem 1 (50 points):
The nozzle assembly on a fire-fighting boat is fixed to the boat deck by several heavy bolts.
The nozzle is directed at an angle of 35 degrees to the horizontal and has an outlet diameter
of
in. 3 = d
Water flows into the assembly from below the deck through an opening with
diameter in. 10 = D , gage pressure 50 psi and flow-rate
min.
gal
750 = Q
. The volume of the
flow passages within the nozzle assembly is
3 in. 1500 = 2200
N
, and the weight of the
assembly itself is
lb 175 =
N
W
. Assume that the flow is steady, with uniform profiles at
the inlet and the outlet.
i) Draw the control volume that you will use for a mass and momentum analysis of this
flow. The net horizontal and vertical anchoring forces required from the bolts should
appear as reaction forces on the control surface. Draw vectors for these and any other
surface and body forces that should be considered. Label the inlet and outlet surfaces as
you will use them in your analysis.