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A cylindrical wheel billet 1ft. in diameter and 3ft. long, initially at 1000 F, is quenched in oil. Assume that the surface of the billet is 200 F throughout the quenched; assume that the convective heat transfer coefficient between the oil and the billet surface is very large. The steal has the following properties, which may be assumed independent of temperature: K = 25 Btu/h-ft-F, Cp = 0.11 Btu/lbm-F, p = 490 lbm/ft^3, a(alfa) = 130*10^-6 ft^2/s. Estimate the temperature of the hottest point in the billet after five minutes of quenching. Neglect end effects; make the calculation for a cylinder of the given diameter but of infinite length.
During the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the work input during this process. R(air)=287j/KgK
Titanium in the BCC structure has a radius of 0.1423 nm.
Determine the COP of the heat pump that applies energy to a house at a rate of 4500kj/h for each kW of electric power it draws. Also, determine the rate of the energy absorption from the outdoor air.
Cylinder problem, Determine the strains in thick walled cylindrical vessel with inside diameter 1000 mm and outside diameter of 1400 mm
a 10 kw electric heater is used to heat 2 kg of air contained in an insulated rigid tank from 400 kpa and 50 degc to
the upside-down steel a frame shown in the figure is to be bolted to steel beams on the ceiling of a machine room using
Using the knon height and calculated base lenghth, what is the length of the slope of the ramp.
Vertical plane due to the action of the external moment and determine the external moment or force.
a piston-cylinder device initially contains 1.4 kg of refrigent-134a at 140 kpa and 20 degc. heat is now transferred to
The nominal breaking strength of the rope is 10,000 lbs. Calculate how much payload this assembly can allowably pick up. Show your work.
energy is added to a piston cylinder arrangement, and the piston is withdrawn in such a way that the quantity PV remains constant. the initial pressure and volume are 200kpa and 2m3, respectively. the final pressure is 100kpa, calculate the work d..
calculate: a) the overall train value. b) the output rational speed at shaft 5. c) the output torque at shaft 5. Relevant gear data is= NA= 17, NB= 36, NC= 19, ND= 41, worm E = double lead, worm G = triple lead, NH= 37?
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