3 replies to this topic

[wobbler28]

I'm trying to reproduce in Matlab the model of a continuous stirred tank reactor (CSTR) that I've gotten for a project.

The model is written in the state space and uses some dimensionless values, including a "heat transfer coefficient" β. Here's the table:

 

I've been trying to investigate in chemical process books to figure out how to calculate this coefficient (I imagine the numerator is Area times Height, but no idea about the terms in the denominator), but I've found nothing. I think even the order of magnitude of this coefficient would be useful, so I don't mess up when entering the equations. Thanks in advance for your help.

[breizh]

Hi ,
I don't believe so , h should be the heat transfer coefficient , refer to the definition of the Nusselt and Correlation for heat transfer in CSTR .

 

The document attached will confirm it:

 

http://www-bisc.cs.b...ersNik/DNNC.pdf

 

Note : Knowing that Beta is dimensionless and knowing the dimension of the other terms , you should be able to check the dimension of h !

 

Hope this helps

 

Breizh

Edited by breizh, 01 October 2014 - 06:26 AM.

[PingPong]

h = heat transfer coefficient

A = heat transfer area

F_o = volumetric flowrate of heat transfer medium in jacket

ρ = density of heat transfer medium

c_p = specific heat capacity of heat transfer medium

[wobbler28]

Thanks very much for your answers, I think I'm now able to get the right value.

 

Best regards.