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Consider the conditions of Problem 7.49, but now allow for radiation exchange between the surface of the heating element (s = 0.8) and the walls of the duct, which form a large enclosure at 27°C.
(a) Evaluate the steady-state surface temperature.
(b) If the heater is activated from an initial temperature of 27°C, estimate the time required for the surface temperature to come within 10°C of the steady- state value.
(c) To guard against overheating due to unanticipated excursions in the blower output, the heater con- troller is designed to maintain a fixed surface tem- perature of 275°C. Determine the power dissipation required to maintain this temperature for air veloci- ties in the range 5 V 10 m/s.
a mining engineer plans to do hydraulic mining with a high-speedjet of water. a lake is located h300 m above the mine
a rotating shaft is made of 42 mm od and 4-mm thick aisi 1018 cold-drawn steel tubing. it has has a 6-mm-diameter hole
100-kg of R-134a at 180kPa are contained in a piston-cylinder device whose volume is 14.715 cubic meter. The piston is now moved until the volume is one half its original sizes. This is done such that the pressure does not change. Determine the final..
Calculate the force required to punch out a rectangular hole 100m x 50mm in a 2mm thick aluminium sheet. The ultimate strength in shear is 125 MN/m^2.
Three samples of aluminium are subjected to a constant stress and the times required to produce a constant strain of 0.1% during steady state creep at different temperatures are shown in table 1 below.-The temperature at which a strain of 0.1% is p..
a. motorcycle is used to stunt show to go over a valley .if the initial speed at a is u ms then evaluate a ?the minimum
consider a steam power plant with reheat that operates on a modified rankine cycle. steam enters the high-pressure
Consider the interaction of two vortex rings of equal strength and similar sense of rotation. Show that they go through each other.
a steam power plant operating in a rakine cycle has saturated vapor at 600 lbfin2 leaving the boiler. the turbine
a rankine power cycle operates with an open feedwater heater. the boiler pressure is 6.0 mpa. a superheater provides a
A rotating saw blade has 48 teeth and 4 slots. If the room where the saw is used is illuminated with a pulsed light source, at what pulse frequencies will a) the saw blade teeth appear to be stationary? b) The blade slots appear stationary? c) Will t..
The air temperatures are equal. If the drag force on the model was 250 N. Determine the drag on the prototype
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