Principios del Proceso de Congelamiento-Fusión de Desalización, Apuntes de Calor y Transferencia de Masa

¡Descarga Principios del Proceso de Congelamiento-Fusión de Desalización y más Apuntes en PDF de Calor y Transferencia de Masa solo en Docsity! Principles of Freezing-Melting Process First we could analyze the natural process of water freezing to ice in seas and rejecting salts at the interface. The combined heat trans-fer associated with heat removal by the environment, and latent heat release at the water-ice interface results in natural convection fl ows of water. Freezing seawater releases fl uid at the water-ice interface, which is denser that the ambient water. The resulting solute buoyancy force therefore acts downward in addition to the thermal buoyancy force. Flow visualization revealed that the fl ow was downward, below the freezing surface; and convection heat transfer was strongly affected by solute rejection upon freezing [5].In a FM process, fi rst the solution is partially frozen, the ice crystals are physically separated from residual solution (i.e. concentrated solu-tion), and the ice is melted to form the product water. The FM process is accomplished in two major stages: ice crystallization (Stage I), and separation and melting (Stage II) (Figure 10.1). In stage I, nucleation occurs at a suitable supercooling temperature. The nuclei in solution grow to become large ice crystals in a crystallization unit. In stage II, the crystals are separated from the concentrate by a separator (mechani-cal) and then melted to produce pure water. In some cases, a precool-ing step is used on the feed, which reduces heat load in the freezer, https://www.researchgate.net/publication/277706820_Freezing-Melting_Desalination_Process