Engineering, 14.09.2019 02:20 shadoris26
Agas flows through a pipe of 0.08 m inside diameter at a velocity of 2.2 m/s. calculate the heat transfer coefficient h, for the gas on the inside of the pipe wall if the dittus-boelter equation can be used nu = 0.023reo. pr0.4. the prandt number for the fluid is 1.8, its density is 5.8 kg/m", the viscosity is 1.158 x 10 pa s, and the thermal conductivity is 0.02 w/m².k. a) 66 w/m².k b) 1052 w/m²k c) 263 w/m²k d) 88 w/m²k e) 12 w/m²k
Answers: 2
Engineering, 03.07.2019 14:10
Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned
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Engineering, 04.07.2019 18:10
Fluids at rest possess no flow energy. a)- true b)- false
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Engineering, 04.07.2019 18:10
Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.
Answers: 3
Engineering, 04.07.2019 18:20
Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.
Answers: 1
Agas flows through a pipe of 0.08 m inside diameter at a velocity of 2.2 m/s. calculate the heat tra...
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