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Consider a thin, 50 mm X 50 mm fuel cell similar to that of Example 1.5, with air in parallel flow over its surfaces. Very small-diameter wires are stretched across both sides of the fuel cell at a distance x = xc from the leading edge in order to trip the flow into tur- bulent conditions. Using an appropriate correlation from Chapter 7, determine the minimum velocity needed to sustain the fuel cell at Tc = 77°C, and the associated location of the wire. The air and large sur- roundings are at Too = Tsur = 27°C and the fuel cell dissipates Eg = 11 W. The fuel cell emissivity is s = 0.85.
An outside wall of a building is constructed of 1/2 inch gypsum sheeting, 8 inches of concrete block (hollow, 3 oval core), and 4 inches of common brick. The inside of the building is maintained at 75F dry-bulb temperature and 65F wet-bulb temperatur..
An entrepreneur has discovered a way to seed thunderclouds so as to prevent them from producing hail. The entrepreneur wishes to sell its invention to the government or to a cotton-farmers organization.
calculate the following the u10050 stirling motor stirling engineoverall efficiency thermal efficiency mechanical
the acceleration of a particle is given by a -ks2 where a is in meters per second squared k is a constant and s is in
a j type thermocouple referenced at 70f has a measured emf of 2.878mv. what is the tempature of the measured
Use the thin-airfoil theory to find the center of pressure (as a function of lift coefficient) and the moment coefficient about the aerodynamic center for the NACA 2412 and the NACA 4412?
Simplify the appropriate Navier-Stokes equation for the ?ow between parallel plates assuming u ¼ u(y) and gravity in the z-direction. The streamlines are assumed to be parallel to the plates so that v ¼ w ¼ 0.
qualitatively plot the following processes on p-v t-v and p-t diagrams. use an arrow sign pointing to the process
Consider a simply supported beam of length 50 ft subjected to a uniformly distributed downward load of 10 kips/ft from x=10 ft to x=40 ft and concentrated downward loads of 100 kips at x=10 ft and x=40 ft. Determine the shear and moment diagrams from..
1. Natural gas and 100% excess air enter the combustion chamber of the Capstone micro-gas turbine at 400 kPa and 452 °C.
gaseous hydrogen at 10 bars and 27 degrees celsius is stored stored in a 100 mm diameter spherical tank having a steel
If the duct is wrapped with a 25-mm-thick layer of 85% magnesia insulation (k = 0.050 W/m · K) hav- ing a surface emissivity of s = 0.60, what are the duct wall temperature, the outer surface temperature, and the heat loss per unit length?
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