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Identificación de DOF en balances de materia

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Identificación de DOF en balances de materia

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Quiz sobre grados de libertad en balances

Created by

Hector de Jesus Cruz
Hector de Jesus Cruz
Mexico

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Identificación de DOF en balances de materia
 

Identificación de DOF en balances de materiaOnline version

Quiz sobre grados de libertad en balances

by Hector de Jesus Cruz
1

Qué es un grado de libertad en balances de materia?

2

Cómo se determina el DOF en un sistema de balances de materia?

3

Si tienes tres balances de especie y dos ecuaciones restantes, ¿qué indica DOF?

4

En un reactor con 2 especies A y B y tres balanzas, ¿qué indica DOF 0?

5

Si entra una corriente a un tanque y sale a otra, ¿qué aporta DOF adicional?

6

¿Qué papel juegan reac­ciones químicas en DOF de balances de materia?

7

Si se conoce la composición de entrada pero no de salida, ¿qué ocurre con DOF?

8

En balances de materia con holdup en tanque, ¿qué añade DOF?

9

¿Qué ocurre con DOF si se imponen tasas de reacción conocidas?

10

¿Qué significa DOF negativo en balances de materia?

Explicación

El DOF es cuántas variables independientes quedan al aplicar las ecuaciones de balance.

Se resta el número de ecuaciones independientes de las variables desconocidas.

DOF = variables desconocidas − ecuaciones independientes.

DOF = 0 implica que no quedan variables libres.

Las salidas y entradas introducen variables que deben cumplirse con balances.

Las tasas de reacción suelen ser variables desconocidas que afectan DOF.

Desconocer salidas incrementa las variables por determinar.

El holdup añade una variable más que debe equilibrarse.

Con cinética conocida, las velocidades ya no son desconocidas.

DOF negativo indica más ecuaciones que variables, requerirá revisión.

 
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