Question

Resistive heater is embedded in a ceramic rod that is 100mm in length and 30mm in diameter. The
heating element assembly is exposed to two different conditions:
(a) Water with a temperature of 300K flowing over the entire surface with a velocity of 1 m/s
(b) Air, also at 300K but flown at a velocity of 10 m/s over the entire surface
To achieve this, the heating element requires 2.7 kW for (a) and 2.5W for (b) to maintain a spatially
uniform surface temperature of 370K. Determine heat transfer coefficient for each situation and
compare them.

Answer 1