Engineering, 28.09.2019 00:10 amakayla57
Along 24 cm diameter shaft of stainless steel 304 (kstst = 13.72 w/m. k, rho = 7721 kg/m^3, cp = 490 j/kg. k) comes out from an oven at a uniform temperature of 636°c. the shaft is then exposed to a cross flow of air (ka = 45.89 w/m. k, rho = 0.6964 kg/m^3, cp = 1034 j/kg. k) at a velocity of 20 m/s and temperature of 218°c with a convection coefficient of h = 48.74 w/m^2.k. (a) how long does it take for the shaft to have a minimum temperature of 388°c? (b) calculate the maximum temperature of the shaft at that time as in part (a).
Answers: 2
Engineering, 04.07.2019 18:10
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
Engineering, 04.07.2019 18:10
Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?
Answers: 2
Engineering, 04.07.2019 19:10
When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?
Answers: 2
Engineering, 04.07.2019 19:10
Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.
Answers: 1
Along 24 cm diameter shaft of stainless steel 304 (kstst = 13.72 w/m. k, rho = 7721 kg/m^3, cp = 490...
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