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Consider Problem 8.47. A more realistic solution would account for the resistance to heat transfer due to free convection in the paraffin during melting. Assuming the tube surface to have a uniform temperature of 55°C and the paraffin to be an infinite, quiescent liquid, determine the convection coefficient associated with the outer surface. Using this result and recognizing that the tube surface temperature is not known, determine the water outlet temperature, the total heat transfer rate, and the time required to completely liquefy the paraffin, temperature is 27°C, estimate the surface temperature of the cable.
a manometer is connected to a water pipe to measure the pressure at the center of the pipe. the manometer is
a steady flow compressor is used to compress air from 1 atm 25ordmc to 8 atm in an adiabatic process. the compressor
A large 3-phase, 4000 V, 60 Hz, squirrel-cage induction motor draws a current of 385 A and a total active power of 2344kW when operating at full-load. The corresponding speed is accurately measured and is found to be 709.2 r/min.
A well-insulated heat exchanger is used to heat water (cp = 4.18 KJ/kg*K) from 300 K to 90°C with a mass flow rate of 3 kg/s. Heat is supplied by hot oil (cp = 2.3 KJ/kg*K) that enters the heat exchanger at 200°C with a mass flow rate of 15 kg/s.
Air at 14.7 psia, 50°F (DB), and 60% relative humidity is first heated to 110°F (DB) and then humidified by introducing water using an “air washer.” The air leaves the humidifying section at 70°F (DB).
an irrigation pump is used to draw water from a reservoir and deliver it to an irrigation ditch at a mass flow rate of
Model a cup of coffee as a closed system containing 1 lbm of pure water at constant pressure of 14.7 psia. Using your knowledge of the 2nd Law, prove that it would be impossible for coffee at room temperature of 70 °F to heat up to 120 °F by receivin..
Determine the nature of the relationship between these variables - calculate the actual velocity of the jet and its flow rate in kg s-1 .
the free convection heat transfer coefficient on a thin hot vertical plate suspended in still air can be determined
A combined cycle power plant burns natural gas and produces 600MW and has an efficiency of 48%. Find the whole sale cost of natural gas and determine the cost of the fuel burned per second for the plant to produce it rated output of 600MW
using the general form of the reynolds transport theorem derive the equation of conservation of linear momentum for a
nerve impulses travel at different speeds depending on the type of fiber through which they move. the impulses for
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