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A steam pipe (kpipe = 45 W/m·K) having 70 mm inner diameter and 85 mm outer diameter is covered with a 35 mm thick layer of insulation (kins = 0.15 W/m·K). In order to protect the insulation material from the humid environment, the pipe is further covered by a 25 mm thick layer of ceramics material (kceramics = 0.075 W/m·K). The heat transfer coefficient inside and outside of the pipe are 220 W/m2 ·K and 6.5 W/m2 ·K, respectively. Steam temperature is maintained at 350ºC whereas the average outside air temperature is 30ºC. Under steady state condition, the temperature at the outer surface of the ceramic layer is 77.76ºC. Calculate the heat flux crosses the inner surface and outer surface of the pipe, respectively.
air enters the compressor of a regenerative gas-turbine engine at 300 k and 100 kpa where it is compressed to 800 kpa
a 0.5-m3 vessel contains 10 kg of refrigerant-134a at -20oc. determine a the pressure b the total internal energy and c
To what three different audiences might you have to give a presentation? How would the presentation differ for each? Which one would be the most challenging for you?
Application: Microstrip line. A conducting strip with dimensions as shown in Figure 14.34 is located above a conducting surface. The strip is very long and the conducting surface is infinite.
Atmospheric air at T = 40°C with a free stream velocity u = 8 m/s flows along a flat plate L = 3 m long which is maintained at a uniform temperature of 100°C. Calculate the average heat transfer coefficient over t
a steam power plant operates with a boiler output of 20 kgs steam at 2 mpa 600degc. the condenser operates at 50degc
you have been hired to develop a package transfer slide for a global company. the slide has length l. the slide is to
the water behind hoover dam in nevada is 206 m higher than the colorado river below it. at what rate must water pass
A 5-ft-diameter steel pipe is made of 3 8 -in. plate with groove-welded longitudinal joints. Assuming an allowable tensile strength of 13,000 psi and a joint efficiency of 100%, compute the safe head of water on the pipe.
a truck starts from rest and travels with a constant acceleration of 1.5 fts2. after a time t it maintains a constant
1) Explain the term reversibility. 2) Write the two property equations involving entropy. 3) What is meant by compressibility factor? 4) What is meant by partial molar property?
Which chromium plating is more eco-friendly - trivalent or Hexavalent? Justify your answer in the light of environmental issues caused.
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