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Topic: analytical solution laminar flow in rectangular microchannel
Replies: 29   Last Post: Mar 21, 2013 4:58 AM

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 Torsten Hennig Posts: 2,419 Registered: 12/6/04
Re: analytical solution laminar flow in rectangular microchannel
Posted: Oct 31, 2012 3:23 AM
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> > I tried the codes but there is error.
> >
> > In an assignment A(I) = B, the number of elements

> in
> > B and I must be the same.
> >
> > How to identify the error?
> >
> > Thank you.
> >
> > Regards,
> > Anne

>
> I could identify one error in the code: in the
> definition of term1, you will have to use y(i)
> instead of y.
> And take care that w,h and z are scalars, not
> vectors.
>
> eps=1e-8;
>
> For i = 1:21
> y(i) = 5*(i-1);
> term1 = 1.0;
> term2 = 1.0;
> n = 1;
> a = 0;
> b = 0;
> While (term1 > eps) | (term2 > eps)
> term1 = 1/n^3 [1-(cosh(n*pi* y(i)/h))/(cosh(n*pi*
> w/h))]* sin(n*pi* z/h);
> term2 = 192*h/(n^5* pi^5* w)*tanh(n*pi*w/h)
> a=a+term1;
> b=b+term2;
> n=n+2;
> end
> b=1-b;
> ux(i)=48*Q/(pi^3*h*w)*a/b;
> end
>
> Best wishes
> Torsten.

One more error:

Instead of
While (term1 > eps) | (term2 > eps)
use
While (abs(term1) > eps) | (abs(term2) > eps)

Best wishes
Torsten.

Date Subject Author
10/28/12 Anne
10/29/12 Torsten Hennig
10/29/12 Anne
10/29/12 Torsten Hennig
10/29/12 Anne
10/30/12 Torsten Hennig
10/31/12 Torsten Hennig
11/3/12 Anne
11/3/12 Torsten Hennig
11/4/12 Anne
11/5/12 Torsten Hennig
11/16/12 Anne
11/16/12 Torsten Hennig
11/16/12 Anne
11/19/12 Torsten Hennig
11/19/12 Torsten Hennig
12/3/12 Anne
12/4/12 Torsten Hennig
12/4/12 Anne
12/4/12 Torsten Hennig
12/4/12 Anne
12/4/12 Torsten Hennig
12/4/12 Anne
12/4/12 Torsten Hennig
12/4/12 Anne
12/5/12 Torsten Hennig
12/5/12 Anne
12/5/12 Anne
12/6/12 Torsten Hennig
3/21/13 Anne

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