Heat transfer
Previous year question paper with solutions for Heat transfer
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- Define Thermal conductivity. How it is different from apparent thermal conductivity?
- What is meant by critical thickness of insulation? How it is calculated in case of cylinder?
- Define Stefan Boltzman’s law.
- Why thin fins are preferred over a thick fin?
- What is the limitation of LMTD method?
- Define shape factor of radiation. Calculate all the shape factors of an isosceles vertical triangle.
- Define Grashoff Number. What are the forces associated with it?
- Define effectiveness and NTU of a heat exchanger.
- Define hydrodynamic boundary layer. Which non dimensional number governs the relative magnitude of hydrodynamic and thermal boundary layers?
- State Buckingham pi theorem. What are repeating variables, how they are selected?
- What is meant by critical thickness of insulation? How it is calculated in case of cylinder?
- Define Stefan Boltzman’s law.
- Why thin fins are preferred over a thick fin?
- What is the limitation of LMTD method?
- Define shape factor of radiation. Calculate all the shape factors of an isosceles vertical triangle.
- Define Grashoff Number. What are the forces associated with it?
- Define effectiveness and NTU of a heat exchanger.
- Define hydrodynamic boundary layer. Which non dimensional number governs the relative magnitude of hydrodynamic and thermal boundary layers?
- State Buckingham pi theorem. What are repeating variables, how they are selected?
- Define Thermal conductivity. What is the effect of temperature on it?
- What is meant by critical thickness of insulation? How it is calculated in case of sphere?
- Define Kirchoff’s law of radiation.
- Why thin fins are preferred over thick fins?
- Draw temperature profile of a counter-flow heat exchanger.
- What is reciprocity theorem?
- Differentiate Nusset number and Biot number.
- What is fouling factor of a heat exchanger? Write value for overall heat transfer coefficient considering fouling.
- Define Newtonian heating of solids.
- Define grey body.