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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.
An aircraft that can travel at 300 km h 1 attempts to fl y due south in a westerly cross-wind of 50 kmh1 . What is the resultant velocity of the aircraft?
consider two reversible refrigerators operating in series. the first refrigerator removes heat at the rate of 250 kw
3 kg of refrigerant 22 undergoes a process for which the pressure-specific volume relation is pv^-0.8 = constant. The initial state of the refrigerant is 12 bar and 60 degrees C. The final pressure is 8 bar. Kinetic and potential energy effects are n..
a hypersonic gun tunnel is used to generate short-duration high-speed flows and typically consists of two cylindrical
a satellite is in earth orbit with an altitude at perigee of 555.0 km and an altitude at apogee of 1200.0 km. a. what
a particle known as a pion lives for a short time before breaking apart into other particles. suppose it is moving at a
a buoy is attached to the ocean floor with a rope.the ocean currents exert a horizontal 1000-n force on the buoy. the
A small hoist is mounted on the back of a pickup truck and is used to lift a 500N crate . Determine the force exerted on the hoist by the htdraulic cylinder BC, the reaction at A.
turbo booster toy that launches a 60-gram insect glider projectile by compressing a helical spring and then releasing
a building for which the heat transfer rate through the walls and roof is 1350 btuh per degree temperature difference
Gas in a closed system undergoes the power cycle as shown in the p-v diagram below as described by 1->2 is a constant pressure process, 2-> 3 is a constant volume process and 3 -> 1 is a pV = const. process. The internal energy U1 = U2 = 30 kJ/kg and..
A paper clip is made of wire 0.7 mm in diameter. If the original material from which the wire is made is a rod 25 mm in diameter, calculate the longitudinal engineering strain and true strain that the wire has undergone during processing.
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