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1. In many cases, we are concerned with free convection involving gases that are contained within sealed enclo- sures. Consider air at 27°C and pressures of 1, 10, and 100 bars. Determine the gure of meritdescribed in Problem 9.4 for each of these three pressures. Which air pressure will provide the most effective cooling? Hint: See Problem 6.22.
2. The heat transfer rate due to free convection from a vertical surface, 1 m high and 0.6 m wide, to quiescent air that is 20 K colder than the surface is known. What is the ratio of the heat transfer rate for that situation to the rate corresponding to a vertical surface, 0.6 m high and 1 m wide, when the quiescent air is 20 K warmer than the surface? Neglect heat transfer by radiation and any influence of temperature on the relevant thermo- physical properties of air.
Select the proper heat exchanger from American Industrial Heat Transfer Inc. company. Check whether the pressure drop on the shell side is within allowable pressure drop of 20 psi.
heavy crude oil sg0.925 and nu1.0x10-4 m2s is pumped through a pipeline laid on flat ground. the line is made from
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The compression ratio of a cold air-standard Diesel cycle is 15. The state of the air at the beginning of the compression stroke is 15 °C, 100 kPa. The heat transfer in the combustion process is 1800 kJ/kg. Determine the following:
What will be the length of the specimen after the load is removed? d) The specimen was reloaded until fracture. If the % reduction in area after fracture was 40%, what is the minimum diameter of the specimen at fracture?
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Determine the rate of heat transfer to the mid-stage cold head and determine the rate of heat transfer to the cold head
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what is the specific heat of air in US customary units given that its value in SI units is approximately 1 kN.m/kg.K?
a boiling-water-type nuclear fission reactor has shut down the backup pumps have failed and emergency cooling water
The project engineer, the shop foreman, and a consultant met to discuss the problem. The consultant proposed applying forward and back tension during rolling, the project engineer suggested reducing the reduction per pass, and the shop foreman fav..
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