Published

2011-09-01

Analysing transfer phenomena in osmotic evaporation

Análisis de los fenómenos de transferencia en el proceso de evaporación osmótica

Keywords:

concentration, mass transfer, heat transfer, hydrophobic membrane, diffusion (en)
concentración, transferencia de masa, transferencia de calor, membrana hidrófoba, difusión (es)

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Authors

  • Freddy Forero Longas Universidad del Valle
  • Carlos Antonio Vélez Pasos Universidad del Valle

Osmotic evaporation is a modification of traditional processes using membranes; by means of a vapour pressure differential, produced by a highly concentrated extraction solution, water is transferred through a hydrophobic membrane as vapour. This technique has many advantages over traditional processes, allowing work at atmospheric pressure and low temperatures, this being ideal for heat-sensitive products. This paper presents and synthetically analyses the phenomena of heat and mass transfer which occurs in the process and describes the models used for estimating the parameters of interest, such as flow, temperature, heat transfer rate and the relationships that exist amongst them when hollow fibre modules are used, providing a quick reference tool and specific information about this process.

La evaporación osmótica es una modificación de los procesos tradicionales que utilizan membranas; mediante un diferencial de presión de vapor, producido por una solución de extracción fuertemente concentrada, se transfiere agua solo en forma de vapor a través de una membrana que actúa como cuerpo hidrófobo. Este proceso tiene múltiples ventajas comparado con los procesos tradicionales, pues permite trabajar a presión atmosférica y baja temperatura, ideal para productos sensibles al calor. En este documento se presentan y analizan de forma sintética los fenómenos de transferencia de masa y calor del proceso y se describen los modelos usados para calcular parámetros de interés como flujos, temperaturas, coeficientes de transferencia y sus interrelaciones cuando se utilizan módulos de fibras huecas, con el fin de proveer una herramienta de consulta rápida y concreta.

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Copyright (c) 2011 Freddy Forero Longas, Carlos Antonio Vélez Pasos

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