Determinación de Difusividades Determinación de Difusividades Determinación de DifusividadesFull description
INGENIERÍA EN ALIMENTOS
PROF. MAYEN SANTOS ELVIA
DIFUSIVIDADES (ECUACIONES) EMPIRICAS
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INTRODUCCIÓN
El estudio de la difusión, es parte de la teoría cinética, existen formulaciones que da ecuaciones basadas en varias suposiciones relativas a la interacción entre las moléculas y la difusión para una mezcla binaria. La técnica mas avanzada predice que el coeficiente de difusión debe variar solo en forma ligera con la composición y esto lo confirma con la experimentación. Cuando no se dispone de valores experimentales, es preciso estimarlos a partir de correlaciones publicadas. A veces se dispone de un valor para un conjunto de condiciones de temperatura y presión; entonces las correlaciones
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DIFUSIVIDAD EN GASES Si no hay datos experimentales se puede calcular la difusívidad en base a la teoría cinética de los gases.
ECUACION DE WILKE-LEE Mezclas de gases no polares o mezclas de gas polar con no polar.
Donde: D = Difusividad (m²/s)
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ECUACIÓN DE GILLILAND Para gases polares.
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ECUACION DE HIRSCHFELDER, CHAPMAN – ENSKOG Para gases no polares.
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ECUACION DE FULLER Semiempirica de cualquier gas al 7 % de error.
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ECUACIÓN DE CHAPMAN-ENSKOG
Ecuaciones de predicción y correlación para los estados líquido y gaseoso (en sistemas binarios).
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DIFUSIVIDAD DE GASES
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DIFUSIVIDAD EN LIQUIDOS La teoría de difusión en líquidos esta poco desarrollada y los datos experimentales son menos abundantes.
ECUACIÓN DE WILKE- CHANG Para diluciones diluidas de líquidos.
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DIFUSIVIDAD DE LIQUIDOS
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DIFUSIVIDAD EN SOLIDOS
Los coeficientes de difusión para una pareja de solidos no puede ser predicha exactamente por la teoría, se puede hacer una estimación cualitativa por la teoría de Eyring.
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