hasselhof

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4 years, 66 days

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These are questions asked by hasselhof

Hi,

I am working on making a population balance model for gas bubbles is a stirred reactor. I have data in excel about the bubble size and need to make a population model to compare the experiment with theoretical findings.

But I have not much experience in population balance modeling. Is there anyone who has an example of a solved population balance model in maple? This would help me greatly in understanding the subject. I would want to use the Luo and Svendsen model as I found it most matching with the result.

Kind regards, Hasselhof

I have some excel data which I need to fit in the formula:

0.5a*erfc(0.5*2^0.5*(-x+m1/s1)) + (0.5-0.5a)*erfc(0.5*2^0.5*(-x+m2/s2))

In this formula the coefficient m ans s are mean and standard deviation and a is the weigth of 2 peak in a cummulative gaussian distribution.

I fitted this (I will insert the maple file) and found:

-48736.43 erfc(-0.707x + 0.707) + 48736.43 erfc(0.707x + 0.707)

Can this be correct?

And how do I find the values of m1, s1, m2, s2 and a?

data.xlsx

data_fit.mw

I have a function fitted and found the coeffiecients, the coeffiecient values are found with data from maple

the function is: a*(x+b/c)

my result is 5x+15

How do I get the values of a, b and c? The value of a is 5 that I know, but how does I get that maple gives me all the values of a,b  and c? The problem is that I get one value while i need the values of a, b and c.

Thanks

Hello

I am working on a project where I need to find the parameters of the formula:

1/2*a*erfc(1/2*2^(1/2)*(-x+m1)/s1)+(1/2-1/2*a)*erfc(1/2*2^(1/2)*(-x+m2)/s2)

which is the formula for the cumulative distribution for two gaussian peaks, one with average m1 and standard deviation s1, the other m2 and s2, with weights a and (1-a). I have data in excel that form the gaussian distribution but now I need to find the parameters of the formula that fits these data.

Is there a command in maple to find these parameters or how do I start? And do I need to upload the data from excel to maple or do I need to insert only some values?

Some one who could help me, because it is really hard and I find no information for this.

Hasselhof

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