Advanced Heat Transfer — Summer 2024

Explain the function of extended surfaces with classification.

Derive the equation of heat dissipation for infinitely long fin from the general equation.

Explain graphical method used for two dimensional steady state conduction analysis.

Explain high velocity flow.

Explain lumped parameter analysis along with it's differences from Heisler’s chart.

One end of a long rod of 1 cm diameter is maintained at 500°Cby placing it in a furnace. The rod is exposed to air at 30°Cwith a convection coefficient of 35 W/m2K. The temperature measured at a distance of 78.6 mm was 147.5°C. Determine the thermal conductivity of the material.

Acylinder of diameter 0.6 m with surface temperature of 200°Cis enclosed in a square of 1.2 m side, the material having a thermal conductivity of 2.5 W/mK. The outside surface is at 5°C. Determine the heat loss per 15 m length.

State the assumptions required for the analysis of a long circular rod exposed to ambient air.

State the applications of finned surfaces.

Explain temperature distribution and heat loss for fins of uniform cross section with different tip conditions.

Define effectiveness of fin and state it's equation.

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

Compare the heat transfer coefficients for the condition of two-fold increase in the diameter of the tube; the flow velocity is maintained constant by a change in the rate of liquid flow; assume that there is no change in the temperatures of the liquid and the tube wall and the flow through the tube is turbulent in character.

State the applications of boiling heat transfer.

Draw the boiling curve and identify the burnout point on the curve.1

Discuss various theoretical and empirical equations available to predict natural convection heat transfer coefficient.

State the factors affecting Nucleate boiling.

Differentiate between pool boiling and forced convection boiling.

Discuss different types of processes for condensation of vapour on a solid surface.

State reciprocity theorem for shape factors.

Using Planck’s equation derive the Stefan-Boltzmann equation for emissive power of a black surface.

Explain combined heat transfer coefficient with convection and radiation.

Explain intensity of radiation.

Define and explain the concept of shape factor in radiation heat exchange.

The heat transfer coefficient including convection radiation is 30 W/m² °Cfor the outer surface of the pipe in a large enclosure. Assume pipe surface is black. Calculate the radiation heat transfer coefficient if walls of the pipe surface and enclosure are at 200°Cand 100°Crespectively. Also find heat transfer coefficient by convection.