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Anna University Chennai
Department of B.E Mechanical Engineering
Fifth Semester
ME6502 Heat and Mass Transfer
November / December 2015 Exam Important Questions
(Regulation 2013)
1. A pipe consists of 100 mm internal diameter and 8 mm thickness carries steam at 170°C. The
convective heat transfer co-efficient on the inner surface of pipe is 75 W/m^2C. The pipe is insulated by two layers of insulation. The first layer of insulation is 46 mm in thickness having thermal conductivity of 0.14 W/m°C. The second layer of insulation is also 46 mm in thickness having thermal conductivity of 0.46 W/m°C. Ambient air temperature = 33°C. The convective heat transfer coefficient from the outer surface of pipe = 12 W/m^2C. Thermal conductivity of steam pipe = 46 W/m°C. Calculate the heat loss per unit length of pipe and determine the interface temperatures. Suggest the materials used for insulation.
2. (i) An aluminium rod (k =204 W/mK) 2 cm in diameter and 20 cm long protrudes from a wall
which is maintained at 300°C. The end of the rod is insulated and the surface of the rod is exposed to air at 30°C. The heat transfer coefficient between the rods surface and air is 10 W/m^2K. Calculate the heat lost by the rod and the temperature of the rod at a distance of 10 cm from the wall. (7)
(it) A large iron plate of 10 cm thickness and originally at 800°C is suddenly exposed to an environment at 0°C where the convection coefficient is 50 W/m^2K. Calculate the temperature at a depth of 4 em from one of the faces 100 seconds after the plate is exposed to the environment How much energy has been lost per unit area of the plate during this time? (9)
3. (i) Explain the different modes of heat transfer with appropriate express ions. (6)
(ii) A composite wall consists of 10 cm thick layer of building brick, (10)
4. (i) Define the Biot and Fourier Numbers (4 marks)
(ii) What is meant by lumped capacity ? What are the physical assumptions necessary for a lumped capacity unsteady state analysis to apply (12 marks)
Anna University Chennai
Department of B.E Mechanical Engineering
Fifth Semester
ME6502 Heat and Mass Transfer
November / December 2015 Exam Important Questions
(Regulation 2013)
1. A pipe consists of 100 mm internal diameter and 8 mm thickness carries steam at 170°C. The
convective heat transfer co-efficient on the inner surface of pipe is 75 W/m^2C. The pipe is insulated by two layers of insulation. The first layer of insulation is 46 mm in thickness having thermal conductivity of 0.14 W/m°C. The second layer of insulation is also 46 mm in thickness having thermal conductivity of 0.46 W/m°C. Ambient air temperature = 33°C. The convective heat transfer coefficient from the outer surface of pipe = 12 W/m^2C. Thermal conductivity of steam pipe = 46 W/m°C. Calculate the heat loss per unit length of pipe and determine the interface temperatures. Suggest the materials used for insulation.
2. (i) An aluminium rod (k =204 W/mK) 2 cm in diameter and 20 cm long protrudes from a wall
which is maintained at 300°C. The end of the rod is insulated and the surface of the rod is exposed to air at 30°C. The heat transfer coefficient between the rods surface and air is 10 W/m^2K. Calculate the heat lost by the rod and the temperature of the rod at a distance of 10 cm from the wall. (7)
(it) A large iron plate of 10 cm thickness and originally at 800°C is suddenly exposed to an environment at 0°C where the convection coefficient is 50 W/m^2K. Calculate the temperature at a depth of 4 em from one of the faces 100 seconds after the plate is exposed to the environment How much energy has been lost per unit area of the plate during this time? (9)
3. (i) Explain the different modes of heat transfer with appropriate express ions. (6)
(ii) A composite wall consists of 10 cm thick layer of building brick, (10)
4. (i) Define the Biot and Fourier Numbers (4 marks)
(ii) What is meant by lumped capacity ? What are the physical assumptions necessary for a lumped capacity unsteady state analysis to apply (12 marks)
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