Rw. Lewis et Rs. Ransing, A CORRELATION TO DESCRIBE INTERFACIAL HEAT-TRANSFER DURING SOLIDIFICATION SIMULATION AND ITS USE IN THE OPTIMAL FEEDING DESIGN OF CASTINGS, Metallurgical and materials transactions. B, Process metallurgy and materials processing science, 29(2), 1998, pp. 437-448
Citations number
20
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
It is known from experimental data that for pure aluminum castings man
ufactured via the gravity die casting process, the interfacial heat-tr
ansfer coefficient can vary in the range 500 to 16,000 W/m(2) K. These
coefficients are of significant importance for the numerical simulati
on of the solidification process. The experimentally determined variat
ion of interfacial heat-transfer coefficients with respect to time has
been recalculated to highlight the variation with respect to casting
temperature at the interface. This variation was observed to be of an
exponential nature. Also, the pattern of variation was found to be sim
ilar in all the experimental results. It has been found that all these
patterns of interfacial heat-transfer coefficient variation can be ma
tched by a unique equation that has been proposed as a correlation to
model the metal-mold interfacial heat transfer. The benefit of this co
rrelation is in its ability to approximate the combined effects of geo
metry variation. insulation, chills, die coatings, air gap formation,
etc. during the numerical simulation and its use in the optimal design
of heat transfer at the metal-mold interface.