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An uninsulated steam pipe passes through a room in which the air and walls are at 25°C. The outside diameter of the pipe is 70 mm, and its surface temperature and emissivity are 200°C and 0.8, respectively. What are the surface emissive power and irradiation? If the coefficient associated with free convection heat transfer from the surface to the air is 15 W/m2 · K, what is the rate of heat loss from the surface per unit length of pipe?
briefly answer the followinga system consisting of 1 kg of saturated water vapor at 100kpa and 101.3c is cooled unitl
Suppose you are appointed as a material engineer at an industry company. The company produces, cutting tools, various car and truck spare parts using different steels. The steels as raw materials to make the parts. All steels are round bars with 50 m..
superheated water vapor enters and insulated turbine operating at steady state at 20 bar and 400 degc and exits at 1.5
air flows steadily through an adiabatic non-ideal turbine entering at 150 psia 900degf and 350 fts and leaving at 20
ammonia vapor flows through a valve. it enters the valve at a pressure of 8 bar and a temperature of 120c and after
The shear modulus of the shaft material is 80 GPa. Calculate the maximum shear stress in the shaft and the angle of twist.
two cylinders are filled with liquid water ? 1000 kgm3 and connected by a line with a closed valve. a has 100 kg and b
How can we rotate a disc hanged with weights freely without external effects other then gravitational force cont?
a small steam power plant has a boiler exit of 3 mpa 400degc while it maintains 50 kpa in the condenser. all the
consider a 20-l evacuated rigid bottle that is surrounded by the atmosphere at 100 kpa and 27 celsius. a valve at the
0.112m^3 of gas has a pressure of 138kN/m^2. It is compressed to 690kN/m^2 according to the law PV^1.4 = C. Determine the new volume of the gas.
an aluminum cube initially at 400oc with a dimension of 2 cm on each side is cooled using 30oc air with a convection
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