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A gas mixture contains 20% CO2 and 10% H2o by volume. The total pressure is 2 atm. The temperature of the gas is 927oC. The mean beam length is 0.3 m. Calculate the emissivity of the mixture.
Air, an ideal gas, is isentropic ally compressed from V1 = .36 ft^3, P1 = 14.5 psia, T1 = 70 F, to V2 = .03 ft^3 (compression ratio = 12). Find T2, P2 and W (work in Btu) for this process:
boiling water flows through thin-walled copper tubes in a cross-flow heat exchanger and atmospheric air flows across
a piston-cylinder device has nitrogen gas at 160 kpa and 158oc. the 23-cm diameter piston initially pushes against a
How long should the bubbles remain in the water to achieve a vapor concentration at the center that is 99% of the maximum possible (saturated) concentration?
atank of 0.1-m3volume contains air at 298.15k 25degc and 101.33kpa.the tank is connected to a compressed-air line which
A tube viscometer was used to measure the viscosity of a clay suspension at 20°C. The tube radius is 2.5 cm and length is 1 m The following data have been collected (see the Table on right). The shear rate at the wall can be approximated to be 4Qz..
Describe the methods used. Show a simple schematics sketch of the joining method and briefly describe the process. Compare the advantages and disadvantages of each joining method.
two suppliers manufacture a plastic gear used in a laser printer. the impact strength of these gears is measured in
the density of a liquid is to be determined by an old 1cm diameter cylindrical hydrometer whose division marks are
A 30-cm-long, 1-cm-diameter aluminium fin (k=237 W/m·K) is exposed to an environment at 22oC. The base temperature of the fin is maintained at 80 oC. The heat transfer coefficient between the rod and the surrounding air is 11 W/m2·K.
A refrigerator uses a R-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s.
water and steam enter an insulated mixing chamber in steady flow. the liquid water enters at 20 0c and 3 bars with a
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