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Parabolic copper fins that are 2 mm thick at the base and 15 mm long are installed on the outside of a 5 mm thick AISI 304 wall. The fins are placed 4 mm apart on-center. The fins are exposed to a fluid 600 C and with a heat transfer coefficient of 300 W m-2 C-1. The other side of the wall is exposed to boiling water at 100 C with a heat transfer coefficient of 500 W/m2K. The contact conductance between the wall and fins is 2 x 104 W/m2K.
a) Draw the thermal resistance circuit for this problem
b) Calculate the fin efficiency and fin resistance
c) Calculate the rate of heat transfer per unit area of wall
Water flows through a 1 [cm] diameter circular pipe at a flow rate of 127 [cm3/s]. Determine the entrance length.
in a tensile test for an alloy used for ballistic-missile launch tubes on boomer submarines the yield strength was
the water in a 25 m deep reservoir is kept inside by a 150 m wide wall whose cross section is an equilateral triangle.
consider fully developed laminar flow with constant properties in a circular tube. let the surface be insulated but let
This problem came from the "kinematics of particles" part holding the "Determination of the motion of a particle" section, so use the formula relating to this section of this part.
Design a hollow steel shaft to transmit 225 kw of power at 80 rpm without exceeding a shearing stress of 60 MPa. Consider only torsion and assume that there are no stress concentrations. Make the ratio of the outside diameter to the inside diameter t..
a 2.5 lbf block b is moving with a velocity vo of magnitude vo 6fts as it hits the 1.5 lbf sphere a which is at rest
Liquid water at 200 kPa and 20 C is heated in a chamber by mixing it with superheated steam at 200 kPa and 150 C. Liquid water enters the mixing chamber at a rate of 1.3 kg/s, and the chamber is estimated to lose heat to the surrounding air at 25 C a..
The power output of an ideal, open-cycle gas turbine cycle is 75 MW and its pressure ratio is 16. Air enters the compressor at 520 R and enters the turbine at 2800 R. Using variable specific heats at 1000°F: cp = 0.263 Btu/lbm-R and k = cp/cv = 1.353..
air is adiabatically compressed in a non flow process from a pressure of 14.7 psia and temperature of 70 degrees to 200
steam enters a converging-diverging nozzle operating at steady state with p1 40 bar t1 400oc and a velocity of 10 ms.
a heat pump maintains a temperature of 25degc inside a house. the house leaks 0.8 kw per degree temperature difference
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