Exam Details
| Subject | Heat And Mass Transfer | |
| Paper | ||
| Exam / Course | Diploma in Mechanical Engineering (DMEVI)& B.Tech. MECHANICAL ENGINEERING 1-4 (BTMEVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
What are the different modes of heat transfer? Explain their potential for occurrence.
Determine the heat flow cross a plane wall of 10 cm thickness with a thermal conductivity of 8.5 W/m.K. When the surface temperatures are steady and at 200°C and 50°C, the wall area is 2 m^2. Also find the temperature gradient in flow direction.
What do you mean by critical radius of insulation? Explain its concept with the help of material and surface resistance.
An ice box has a composite wall made up of 1 mm thick aluminium sheet on the inside surface, 3 cm thick wooden board on the outside and 5 cm cork insulation between the two. Ice at is in contact with the aluminium surface. The unit surface conductance on the outside box is 11·61 The thermal conductivities of wood, cork and aluminium are 0.209, 4·2 x 205·83 respectively. The outside temperature is 27°C. Calculate
the thermal resistance of the composite wall, and
the rate of heat transfer per unit area.
Explain Reynolds analogy between momentum and heat transfer.
Derive an expression for Lambert's cosine law.
Define the diffusion coefficient for a binary mixture. Is this coefficient dependent upon temperature, pressure and composition of the mixture? Explain.
prove that the mean temperature difference in a parallel flow heat exchanger is given by
LMTD(tm)= t1-t2/loge[t1/t2]
Derive an expression for temperature distribution in a slab of thickness when its two faces are at temperatures t1 and t2, the thermal conductivity varies linearly with temperature according to
K
where is a constant. Assume one-dimensional steady state heat conduction with no heat generation.
Explain the phenomenon of equimolar counter diffusion. Derive an expression for equimolar counter diffusion between two gases or liquids.
Prove that the shape factor of a hemispherical bowl of diameter D with respect to itself is 0.5.
Define the Fourier number, Biot number, Schmidt number, Sherwood number, Lewis number, Reynolds number and Prandtl number.
7. Write short notes on any four of the following:
Transient Heat Conduction
Heisler Charts
Turbulent Flow
Forced Convection
Kirchhoffs Law
Radiation Shields
Determine the heat flow cross a plane wall of 10 cm thickness with a thermal conductivity of 8.5 W/m.K. When the surface temperatures are steady and at 200°C and 50°C, the wall area is 2 m^2. Also find the temperature gradient in flow direction.
What do you mean by critical radius of insulation? Explain its concept with the help of material and surface resistance.
An ice box has a composite wall made up of 1 mm thick aluminium sheet on the inside surface, 3 cm thick wooden board on the outside and 5 cm cork insulation between the two. Ice at is in contact with the aluminium surface. The unit surface conductance on the outside box is 11·61 The thermal conductivities of wood, cork and aluminium are 0.209, 4·2 x 205·83 respectively. The outside temperature is 27°C. Calculate
the thermal resistance of the composite wall, and
the rate of heat transfer per unit area.
Explain Reynolds analogy between momentum and heat transfer.
Derive an expression for Lambert's cosine law.
Define the diffusion coefficient for a binary mixture. Is this coefficient dependent upon temperature, pressure and composition of the mixture? Explain.
prove that the mean temperature difference in a parallel flow heat exchanger is given by
LMTD(tm)= t1-t2/loge[t1/t2]
Derive an expression for temperature distribution in a slab of thickness when its two faces are at temperatures t1 and t2, the thermal conductivity varies linearly with temperature according to
K
where is a constant. Assume one-dimensional steady state heat conduction with no heat generation.
Explain the phenomenon of equimolar counter diffusion. Derive an expression for equimolar counter diffusion between two gases or liquids.
Prove that the shape factor of a hemispherical bowl of diameter D with respect to itself is 0.5.
Define the Fourier number, Biot number, Schmidt number, Sherwood number, Lewis number, Reynolds number and Prandtl number.
7. Write short notes on any four of the following:
Transient Heat Conduction
Heisler Charts
Turbulent Flow
Forced Convection
Kirchhoffs Law
Radiation Shields
Other Question Papers
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Subjects
- Advanced Dynamics Of Machine
- Automobile Engineering
- Combustion Engineering
- Computer Aided Manufacturing
- Computing Aided Design
- Design of Machine Elements
- Engineering Metallurgy
- Engineering Thermodynamics
- Experimental Stress Analysis
- Finite Element Analysis
- Fluid Mechanics
- Heat And Mass Transfer
- Heat Transfer
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- Industrial Engineering
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- Kinematics and Dynamics of Machines
- Machine Design - I
- Machine Design-Ii
- Machine Drawing
- Machines Tools
- Maintenance Engineering
- Material Science
- Materials Handling
- Mechanical System Design
- Mechanical Vibration
- Mechanics Of Materials
- Mechatronics
- Metrology
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- Non-Conventional Energy Resources
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- Nuclear Power Engineering
- Optimisation Techniques In Engineering
- Optimization For Engineering Design
- Power Plant Engineering
- Power Transmitting Elements
- Product Development And Design
- Production And Operations Management
- Production Technology - Ii
- Production Technology-I
- Refrigeration And Air Conditioning
- Refrigeration System
- Robotics
- Safety Engineering
- Technical Entrepreneurship
- Thermal Engineering
- Thermal Engineering - I
- Thermofluid Engineering
- Total Quality Management (Tqm)
- Tribology
- Turbo Machines
- Unconventional Manufacturing Processes
- Welding Engg.