Example
As described in the previous slide, the cooling process can now be modeled as heat loss through a semi-infinite solid. (Since the substrate is significantly thicker than the coating layer) The molten material is at the fusion temperature Tf and the substrate is maintained at a constant temperature Ti. Derive an expression for the total time that is required to solidify the coating layer of thickness d.
- Assume the molten layer stays at a constant temperature Tf throughout the process. The heat loss to the substrate is solely supplied by the release of the latent heat of fusion.