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Spherical steel balls of diameter D 10 mm are cooled from an initial temperature of Th,i 1000 K by submersing them in an insulated oil bath initially at Tc, i 300 K. The total mass of the balls is mh 200 kg, while the mass of oil is mc 500 kg. The convection coefficient associated with the spheres and the oil is h 40 W/m2 · K, and the steel properties are kh 40 W/m · K, ph 7800 kg/m3, and ch 600 J/kg · K. Determine the steady-state ball and oil temperatures, and the time needed for the balls to reach a temperature of Th, f 500 K.
a closed system consists of an ideal gas with constant specific heats that remain constant. the gas undergoes a proces
Calculate the conduction heat loss for the following wall: 15ft long, 8ft tall. Calculate for 8 hr, inside temperature at 78F and the outside temperature at 3F. Wall components from outside to inside are brick; 1.2cm(1/2 in.) plywood; wood studs, 5x1..
two mating spur gears are 20 mm wide and the tooth profiles have radii of curvature at the line oif contact of 10 and
one of the problems of wind tunnel testing at airspeeds near sonic speed is the large effect on the flow conditions of
Knowing that the gage pressure inside the tank is 5 MPa, determine the maximum stress and the maximum shearing stress at point L.
an ancient underground aqueduct has been completely flooded and conveys water over adistance of 15.8 kilometers into
a double effect evaporator is used in feed forward mode to produce fresh water from sea water vontaining 3.5wt
a column is 50 in. long and is built in at both ends. the column cross section is 1.5 x 3.5 in and is made from 1030 hr
an auditorium has to be air-conditioned first by cooling and dehumidifying and then heating for summer when the outdoor
The decision was made by NASA to abandon rocket-launched payloads into orbit around the earth. We must now rely on the Russians for this capability. Use the principles of engineering economy to examine this decision.
Determine the stress in a stay at a given temperature. A steel 'stay' of effective length 5m is fitted in between the walls of a ships refrigerated compartment when the temperature is 18 degrees centigrade.
molesec of n2 is pressurized from 300 k and 10 bar to 100 bar. assume adiabatic. calculate the minimum power for this
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