In: Mechanical Engineering
Q1) In a food processing facility, a spherical container of inner
radius r1 =41 cm, outer radius r2 = 43 cm, and thermal conductivity
k = 2 W/m · °C is used to store hot water and to keep it at 105°C
at all times. To accomplish this, the outer surface of the
container is wrapped with a 510-W electric strip heater and then
insulated. The temperature of the inner surface of the container is
observed to be nearly 100°C at all times. Assuming 80 percent of
the heat generated in the heater is transferred to container
a) Express the differential equation and the boundary conditions
for steady one-dimensional heat conduction through the
container,
b) Obtain a relation for the variation of temperature in the
container material by solving the differential equation.
c) Determine the temperature at the center plane of the
container