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May 27, 2020
09:04 PM

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May 27, 2020
09:04 PM

Divide by zero error in tend

Hi everyone,

In my reactor design with Mathcad, I am getting an error in "tend" part of the design which says "divide by zero" when I click on "tend" and therefore I am not able to see the changes in temperature and conversions with the changes in volume. Although I checked several times to see whether there is any zero value in the denominators or not, I couldn't find any. I would be super happy if you can help me with it. You can find the file and the photos attached in the mail.

Thank you for taking your time.

Selim

Solved! Go to Solution.

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May 28, 2020
05:27 AM

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May 28, 2020
05:27 AM

You have a divide by zero error here:

You set T(0) = 0 in your solve block. I suspect you should be using absolute temperature, so T(0) = non-zero value.

Alan

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May 28, 2020
05:27 AM

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May 28, 2020
05:27 AM

You have a divide by zero error here:

You set T(0) = 0 in your solve block. I suspect you should be using absolute temperature, so T(0) = non-zero value.

Alan

May 28, 2020
12:59 PM

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May 28, 2020
12:59 PM

Hi,

I got the results I am looking for after changing T(0)=0.

Thank you so much Alan 🙂

Best regards,

Selim

May 28, 2020
09:43 AM

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May 28, 2020
09:43 AM

Hi,

By keeping X2 = 1 and T = const, as X1 varies between -1 and 1, the function R2 has discontinuities:

May 28, 2020
01:54 PM

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May 28, 2020
01:54 PM

Hi,

Thank you for such a detailed analysis it seems at some point we are getting errors due to the discontinuities in R2 and since X1 goes to -1. Maybe finding areas that works for solution can be a better approach. In anyway thanks a lot for taking your time on my problem, I really appreciate it 🙂

Best Regars,

Selim