3 replies to this topic

[peclpassic]

Dear Sir

 

Someone told me it is not correct to get the impeller horsepower from the power number vs Re plot, and suggested using

 

CFD is better.  Could anyone please kindly share your valuable experience how can I choose the proper impeller(Ruston

 

turbine, or pitch blade) for the alkyd polymerization reaction (if is this emulsion polymerization) instead of adopt the high

 

cost CFD solving method ?   And, how can I determine the mixing time is fast compare to reaction time, so the agitation

 

intensity is unimportant, and the overall  reaction is dominated by the kinetics if this is valid, there is no means to

 

calculate the impeller hp ?

 

Thank you very much for your kindly help.

[breizh]

Hi ,

Talk to the big names   like Chemineer and Lightnin , they will help you for your design .

Of Course CFD is better but a lot of people are still using the Power number , nothing wrong with that . Go to their websites.

 

http://www.postmixin...s/impellers.htm

 

http://www.spxflow.com/en/lightnin/

 

http://www.lewa.at/e...neer-agitators/

 

Breizh

Edited by breizh, 22 June 2016 - 06:59 PM.

[Napo]

Peclpassic;

 

You can review the article: "Stirred Tank Reactor Design", by Corpstein R, and Dove R., in the Chemical Engineering Progress (CEP) magazine, February 1979, pp. 66-74.

 

Napo.

[curious_cat]

Isn't using CFD to estimate impeller power like using a cannon to kill a mouse in most cases? It'd be a lot more effort to set up & run the CFD Model?