# I am just trying to plot the distance x v. Temp function below. I want it to take the x values from 0 to 0.15. Thank you!

1 view (last 30 days)
David on 9 Jul 2022
Commented: David on 9 Jul 2022
clear all;
close all;
clc;
% Fin Configuration: A
T_s = 500; % [K]
T_inf = 350; % [K]
L = 0.2; % [m]
ST_k = 14.9; % [W/m*K]
U_inf = 10; % [m/s]
D = 0.002; % [m]
nu = 29.4*10^-6; % [m^2/s]
Pr = 0.688; % no units
Re = (U_inf*D)/(nu); % no units
h = ((((0.664*(Re)^(1/2))*((Pr)^(1/3)))*(ST_k))/(L)); % [W/m^2*K]
P = pi*D; % [m]
A = pi*D*L; % [m^2]
m = sqrt((h*P)/(ST_k*A)); % [1/m]
x = 0:0.15; % [0 to 15cm] or [0 to 0.15m]
Q = sqrt(h*P*ST_k*A)*(T_s - T_inf)*tanh(m*L); % [W] or [J/s]
T = 6.3763*cosh(m*(L-x))+350; % [K]
%figure('Name','Fin A Temp. v. Length')
plot(x,T);
David on 9 Jul 2022
The plot opens but there is no graph displayed.

KSSV on 9 Jul 2022
Presently in your code x is a single number 0. You need to change that line.
clc; clear all ;
clear all;
close all;
clc;
% Fin Configuration: A
T_s = 500; % [K]
T_inf = 350; % [K]
L = 0.2; % [m]
ST_k = 14.9; % [W/m*K]
U_inf = 10; % [m/s]
D = 0.002; % [m]
nu = 29.4*10^-6; % [m^2/s]
Pr = 0.688; % no units
Re = (U_inf*D)/(nu); % no units
h = ((((0.664*(Re)^(1/2))*((Pr)^(1/3)))*(ST_k))/(L)); % [W/m^2*K]
P = pi*D; % [m]
A = pi*D*L; % [m^2]
m = sqrt((h*P)/(ST_k*A)); % [1/m]
x =linspace(0,0.15); %<-----changed here % [0 to 15cm] or [0 to 0.15m]
Q = sqrt(h*P*ST_k*A)*(T_s - T_inf)*tanh(m*L); % [W] or [J/s]
T = 6.3763*cosh(m*(L-x))+350; % [K]
%figure('Name','Fin A Temp. v. Length')
plot(x,T);
David on 9 Jul 2022
Oh thank you! You've been very helpful.

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