Chapter 14

Self Test 14.1: Sketch of F curves

The F curves for two different tubular reactors is shown below, for a closed–closed system

(a)  Which curve has the higher Peclet number?  Explain.

(b)  Which curve has the higher dispersion coefficient?  Explain.

(c)  If this F-curve is for the tanks-in-series model applied to two different reactors which curve uses the largest number of tanks to model the real reactor, (1) or (2)?


Go to the Solution

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Solution

For plug flow (Da = 0 and Pe = ¥) we have

For small deviation from plug flow

For a CSTR Da = ¥ ‚

(a)  For small Da large Pe.

(b)  For large Da small Pe

(c)  For Plug flow represented by tanks-in-series n ® ¥. Therefore curve (1) is close to plug flow, therefore n is greater for modeling curve than for curve ‚.

 


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