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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Residence Time

Posted 2013年12月17日 GMT-5 19:59 Version 4.4 3 Replies

Sabine Schneider
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I ran a simulation of a polymeric solution inside the metering section of an extruder by using a creeping flow. Afterwards, I implemented the particle tracing module, because I am interested in the residence time of the flow in the extruder, this means how much time the different particles need to exit the extruder.

I already added the auxiliary dependent variable: d(rp)/dt = 1 in the particle tracing module, but I do not know how to illustrate the residence time afterwards.

Is it in the derived values interface? Which sub-interface do I have to choose? When I select e.g. for global evaluation "particle 1" as data set, "last" as time selection and "rp" as expression, I get an error (failed to evaluate variable).

Thanks in advance for the help
3 Replies Last Post 2015年10月8日 GMT-4 11:48
COMSOL Moderator

Hello Sabine Schneider

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Karl Myers
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Posted: 10 years ago 2015年5月3日 GMT-4 20:07
I'm having the same exact problem at the moment! I see your question was back in 2013 and never answered :/ Well, hopefully I can find some help on the issue soon!

All the best,
Karl
I'm having the same exact problem at the moment! I see your question was back in 2013 and never answered :/ Well, hopefully I can find some help on the issue soon! All the best, Karl
Sergei Yushanov Certified Consultant
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Posted: 10 years ago 2015年5月4日 GMT-4 07:59
Karl,

You can use Histogram plot to visualize residence time distribution, as shown in the attached image.

Regards,
Sergei
Karl, You can use Histogram plot to visualize residence time distribution, as shown in the attached image. Regards, Sergei

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Sepideh Ramezani
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Posted: 9 years ago 2015年10月8日 GMT-4 11:48

Karl,

You can use Histogram plot to visualize residence time distribution, as shown in the attached image.

Regards,
Sergei


Hi,

If I have histogram plot for the residence time distribution, then what does it mean?

[QUOTE] Karl, You can use Histogram plot to visualize residence time distribution, as shown in the attached image. Regards, Sergei [/QUOTE] Hi, If I have histogram plot for the residence time distribution, then what does it mean?

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