HANSER Hanser Publishers, Munich • Hanser Gardner Publications ...

Temperature T
Figure 5.41 Representation of temperature correction for latent heat [22]
heat conduction. The numerical solution of Equation 3.31 using the correction introduced
by GLOOR [22] was given in [25] on the basis of the method of differences after SCHMIDT
[24]. A computer program for this solution is presented in [3]. The time interval used in
this method is
where
Enthalpy
(5.88)
At = time interval
Ax = thickness of a layer
M = number of layers, into which the slab is devided, beginning from the mid plane of
the slab (Figure 5.42)
The mold temperature and the thermodynamic properties of the polymer are assumed
to be constant during the cooling process. The temperature at which the latent heat is
evolved, and the temperature correction W1 (Figure 5.41) are obtained from the enthalpy
diagram as suggested by GLOOR [22]. An arbitrary difference of about 6 0 C is assigned
between the temperature of latent heat release at the mid plane and the temperature at
the outer surface of the slab.
Figure 5.42 Nomenclature for numerical solution of non-steady state conduction in a slab [25]
s