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A two layer wall is made of two metal plates with a surface roughness of about 25 microns and is pressed together at an average pressure of about 8 MPa. The first layer is stainless steel with a thickness of 3 mm and thermal conductivity of 14 W/m-K. The second layer is aluminum with the thickness of 13 mm and a thermal conductivity of 237 W/m-K. On the stainless steel side of the wall, the surface is subjected to a heat flux of 788 W/m2 . On the aluminum side of the wall, the surface experiences convection heat transfer at an ambient temperature of 20?C, where the convection coefficient is 11 W/m2 - K. Determine the surface temperature of the steel plate.
what is meant by the mechanical loss coefficient ? of a material? give examples of designs in which it would play a
The curved wall is well-insulated and may be regarded as adiabatic. Heat transfer between the surfaces occurs only by radiation.
A water pipe of D = 30 cm is buried in soil with a value of k = 0.52 W/mK. The center of the pipe is buried 1 meter below the surface of the ground. The surface of the ground is at -10o C.
a heat engine accepts 200000 btu of heat from a source at 1500 r and rejects 100000 btu of heat to a sink at 600 r.
Determine the heat transfer rate from the steel plates of Problem 7.24 accounting for free convection from the plate surfaces. What is the corresponding rate of change of the plate temperature?
a system has an initial volume of 10 ft3 and expands to a final volume of 20 ft3. the initial pressure is 15 psia. find
25 of the cables have failed after 12 years and 55 failed after 16 years. if the distribution if normal what is the
Two slender rods of negligible weight are pin-connected at A and attached to the 18-lb block B and the 80-lb block C. The coefficient of static friction is 0.55 between all surfaces of contact. Determine the range of values of P for which equilibr..
The engine of the van produces a constant driving traction force F at the wheels as it ascends the slope at a constant velocity v, determine the magnitude of the acceleration of the van,in m/s^2 .when it passes point A and begins to travel on a level..
Calculate pressure on side bars, thrust in the connecting rod and tangential force on the crank pin and (iv) turning moment on the crank shaft.
if the exit velocity needs to be 27 ms and the nozzle tip has a diameter of 0.48 mm what is the volumetric flow rate
a heat pump is used to maintain a house at a constant temperature of 23degc. the house is losing heat to the outside
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