Advanced Heat Transfer — Winter 2023

Define thermal contact resistance? Upon what parameters does this resistance depend?

Write the general heat conduction equation for Cartesian co-ordinates. Derive the equation for following condition: (1) Steady state with internal heat generation (2) Unsteady state without internal heat generation

Explain finite difference method for two-dimensional steady heat conduction.

Define Biot number. State its significance in transient heat.

From the general equation derive the equation of heat dissipation for infinitely long fin.

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Explain lumped capacity? Also write the assumptions for the same in detail?

Derive Temperature distribution relation for cylinder with Steady state and uniform heat Write the general heat conduction equation for Cartesian co-ordinates generation.

Explain with neat sketch why is the flow separation in flow over cylinders delayed in turbulent flow?

Explain the function of extended surfaces with classification Write the general heat conduction equation for Cartesian co-ordinates. From it derive

What is a thermal symmetry boundary condition? How is it expressed mathematically? equation for following conditions:

Define these terms used in the finite difference formulation: node, nodal network, volume element, nodal spacing, and difference equation Write the general heat conduction equation for Cartesian co-ordinates. From it derive

equation for following conditions:

Interpret Grashof number and Rayleigh number with mathematical formula. Also explain

Steady state with internal heat generation their significance in natural convection heat transfer. ii) Unsteady state without internal heat generation

Write a short note on liquid-metal heat transfer?

What are the effects of non-condensable gases in condensing equipment?

What is an irregular boundary? What is a practical way of handling irregular boundary surfaces with the finite difference method?

Write a short note high velocity flow?

Draw the boiling curve and identify the burnout point on the curve

What is the difference between film and drop wise condensation? Which is a more effective mechanism of heat transfer?

Explain Radiation shape factor.

Write a short note on greenhouse effect.

Write a note on Emissivity and absorptivity of gases and gas mixtures

Write the statement of Kirchoff’s low and define emissivity

Explain all the different mechanisms of heat transfer from the human body (a) through the skin and (b) through the lungs

Derive the equation of heat flow between infinite long parallel plates.