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Topic: Non-linear System of Equations
Replies: 1   Last Post: Jan 2, 2013 10:44 AM

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 Alan Weiss Posts: 1,430 Registered: 11/27/08
Re: Non-linear System of Equations
Posted: Jan 2, 2013 10:44 AM

On 1/2/2013 6:01 AM, Yasser wrote:
> Hello, EveryBody
>
> I want to solve the following nonlinear system of equations:
>
> eq1='m=10 '; eq2='k=20 '; eq3='cp=30 '; eq4='ro=40 ';
> eq5='dc=0.18 ';
> eq6='dsi=0.5 ';
>
> eq7='pr=m*cp/k';
>
> eq10='Nuc=2/log(1+2/(Nui))';
> eq11='hc=k*Nuc/dc';
> eq13='G=((1+0.6/(pr)^0.7)^(-5)+(0.4+2.6*(pr)^0.7)^(-5))^(-1/5)';
> eq15='Nusi=-2/log(1-2/(Ndusi))';
> eq16='hsi=k*Nusi/dsi';
>
> eq17='Ac=22*dc/7'; eq18='Asi=22*dsi/7';
> eq19='33.7-(hc*Ac*(Tc-Tg))=0.001';
> eq20='(hc*Ac*(Tc-Tg))-(hsi*Asi*(Tg-Ts))=0.001';
> eq21='(hsi*Asi*(Tg-Ts))-(482.44322353*(Ts-35))=0.001';
>
> The solution must give the values of Tg, Tc and Ts.
> So any help??!!!
>
> I tried to solve them by SOLVE command but NO ANSWER.
>
> Thanks

I suggest that you try using fsolve from Optimization Toolbox to get a