a)

b)

a)

b)

a)

03000ME322052002

and operates in an environment where the ambient temperature is 30 deg C and
the convective heat transfer coefficient ‏بط‎ = 25 W / 117 / K. Find the surface
temperature of the cable when it is bare and also if it is provided with an
insulation outer layer with a material having a thermal conductivity coefficient k
= 0.5 W/m/K and whose thickness satisfies just the critical thickness.

A vertical plate 30 cm high and 1 m wide is maintained at a uniform surface
temperature of 120 deg C and is exposed to an ambient temperature of 30 deg C,
calculate the average heat transfer coefficient by free convection from the plate
and the total heat transfer rate from the plate to the air.

Describe how the first derivative of temperature can be represented by forward,
backward and central finite differences on a uniform grid. Using these
expressions derive the central difference representation of the second derivative
of the temperature.

Air at a pressure of 6 ധന്‌ and a temperature of 300 deg C flows over a 0.5 m
long flat plate at a velocity of 10 m/s. Estimate the amount of cooling necessary
to maintain the plate surface at a temperature of 27 deg C.

Explain what is meant by similar solutions to boundary layer flows.

PART B

Answer any three full questions, each carries 10 marks.

|¬ m |

Find the view factor 223 of the figure shown above using the view factor

relations.

Page 2 of 4

(5)

(5)

(7)

(3)

(7)