HEAT TRANSFER - 5

K(Csu) = 0.92      K(steel) = 0.12 and
K(brass) = 0.26 C.G.S. units.

Solution:

Q = 40⁰c
H = 4.8 cal/s.


Q5: one end of the copper rod ofuniformcross-section and of length 1.5m is in contact with ice and the other end
with water . at what point along its length should be a temperature of 200c maintained so that in steady state, the mass of ice melting is equal to that of steam produced in the same intrval of time?
Assume that whole system is insulated from surroundings.

Solution:

Heat Received at A
steam
At B   
80 x
x = 10.34 m


E6. A uniform copper bar 100 cmlong is insulated on sides and habits ends exposed to the ice and steam respectively. if there is a layer
of water 0.1 mm thick at each rod, calculate the emperature gradient in the bar. K_Cu = 1.04 and K_water = 20.0014 CGS units.

Sol: Let Q₁ and Q₂ be the temperature at the ends of the copper bar.
Heat transfer per sec

Heat transfer through copper bar

Both are equal
= 0.87⁰ c cm