An effectiveness number of transfer units (ε–NTU) model is developed for use in evaporators where the evaporating stream: (1) comprises a volatile solvent and nonvolatile solute(s) and (2) undergoes a significant, but linear change in boiling point elevation (BPE) with increasing solute molality. The model is applicable to evaporators driven by an isothermal stream (e.g., steam-driven or refrigerant-driven) in parallel flow, counterflow, and crossflow configurations where the evaporating stream is mixed. The model is of use in a variety of process engineering applications as well as the sizing and rating of evaporators in high-salinity desalination systems.
An Effectiveness–Number of Transfer Units Relationship for Evaporators With Non-negligible Boiling Point Elevation Increases
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 10, 2015; final manuscript received June 20, 2016; published online August 2, 2016. Assoc. Editor: Amitabh Narain.
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Thiel, G. P., and Lienhard, J. H. (August 2, 2016). "An Effectiveness–Number of Transfer Units Relationship for Evaporators With Non-negligible Boiling Point Elevation Increases." ASME. J. Heat Transfer. December 2016; 138(12): 121801. https://doi.org/10.1115/1.4034055
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