4 freezing boundary fronts consider melting of a semi infinite 0 x les
Question
4. Freezing Boundary Fronts
Consider melting of a semi-infinite (0 ≤ x < ∞) slab of paraffin (octadecane),
initially at the
melting temperature Tinitial = Tmelt = 28.6°C exposed to a temperature Th = 60°C
at x = 0.
Find
(a) The front location after 1 hour
(b) The front location after 2 hours
(c) The time for the melting front to reach 5 cm
(d) The temperature at x = 1 cm after 2 hours.
(Use k = 0.23 W/mK, Cp = 2500 J/kgK,
AH = 250 kJ/kg,
p= 800 kg/m 3
)
III
E