how to code equation
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Cesar Cardenas
el 3 de Feb. de 2023
Comentada: Walter Roberson
el 17 de Feb. de 2023
I'm trying to code these equations. This is my attempt. I would like to plot Cf vs x/L, but x/L as I have it shows me an error..the same with delta/x, not sure why? any help will be greatly appreciated. Thanks much.
Re = 0:500:1000;
x/L = 0:0.2:1;
Cf = 0.664*(Re)^-0.5;
delta/x = 5.0*(Re)^-0.5;
1 comentario
Les Beckham
el 3 de Feb. de 2023
Editada: Les Beckham
el 3 de Feb. de 2023
What are x, L, and delta?
Also, you can't put an expression like x/L on the left hand side of an assignment statement, only a variable name (optionally indexed).
Respuesta aceptada
Sulaymon Eshkabilov
el 3 de Feb. de 2023
Here is the corrected code:
Re = 0:50:1000;
xL = linspace(0,1, numel(Re));
Cf = 0.664*(Re).^(-0.5);
deltaX = 5.0*(Re).^(-0.5);
plot(Cf, xL, 'ro', 'markerfacecolor', 'y')
xlabel('C_f')
ylabel('x_L')
grid on
4 comentarios
Walter Roberson
el 17 de Feb. de 2023
Your h, q, and Re are all scalars, so plotting them on the same graph is not going to be interesting.
T1 = 30;
T2 = 40;
v = 0.5;
x1 = 0.01;
x2 = 0.05;
Pr = 5.18;
nu = 7.708;
k = 0.6184;
d = 995;
Re = v*(x2-x1)/nu
h = 0.3314*(Re.^(0.5))*(Pr.^(0.3))*(k/x2 - x1)
q = h*(x2 - x1)*1*(T2-T1)
plot([h, q, Re],'r*')
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