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Boiler tubes exposed to the products of coal combustion in a power plant are subject to fouling by the ash (min- eral) content of the combustion gas. The ash forms a solid deposit on the tube outer surface, which reduces heat transfer to a pressurized water/steam mixture flowing through the tubes. Consider a thin-walled boiler tube (Dt = 0.05 m) whose surface is maintained at Tt = 600 K by the boiling process. Combustion gases flowing over the tube at Too = 1800 K provide a convection coefficient of h = 100 W/m2 · K, while radiation from the gas and boiler walls to the tube may be approximated as that originating from large surroundings at Tsur = 1500 K.
Explore the effect of variations in Dd and h on q', as well as on relative contributions of convection and radiation to the net heat transfer rate. Represent your results graphically.
For a shaft of 1045 steel rotating at 1,200 rpm and under a transverse load, what is the maximum stress amplitude possible for the lifetime of 1 year of continuous operation?
for a vertical cylinder with an electric heater 2500watt at the basean inletlower part of cylinder with cold water at
cold water at 10degc enters a water heater at the rate of 0.02 m3min and leaves the water heater at 50degc. the water
a rigid vellel with the volume of 10 m3 contains a water-vapor mixture at 400 kpa at 60 percent quality. the pressure
for a crystal with a cubic structure sketch its unit cells showing the following crystallographic directionsa 011 b 212
steam enters the turbine in a vapor power plant at 1600 psia and 1000 degrees f state 1 and expands to a pressure of 1
an air bubble 0.3 in. in diameter is released from the regulator of a scuba diver swimming 100 ft. below the sea sg
What load is needed to generate a transverse center displacement of 5 mm for an aluminium beam of 15 cm length, 2 cm width and 2 mm thickness (in three-point bending). Determine what strain you expect at the bottom surface for this deflection for Al ..
steam is expanded in an adiabatic nozzle. determine the exit velocity if the inlet is a 2 mpa 450oc and the velocity is
For a tall column resting on the ground, axial stress develops due to the columns weight. (a) Derive the stress as a function of position z measured from the bottom of the column, and the total contraction of the column.
a structural member supports loads which produce at a particular point a direct tensile stress of 80 nmm2 and a shear
1. Four (4.0) lbm of CO2 are contained in a piston-cylinder system. The CO2 is initially at a temperature T1=500°R and pressure p1=20 psia. The CO2 undergoes the following two processes:
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