ı want to calculate the flow variable by the specified input by user. for example when ı take l/d=1 and S=0.20 on the chart and then ı read by hand its almost 4.10. but when ı calculate with my code it gives different result. can you help me?
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matlab coder
el 22 de Dic. de 2020
Comentada: Alan Stevens
el 23 de Dic. de 2020
D=input('enter a value of diameter:');
L=input('enter a value of length:');
if L/D==1
% for l/d=1 performance parameters
S=[0 0.00474 0.0188 0.0446 0.121 0.264 0.631 1.33 inf];
% the corresponding vector for the volumetric oil-flow rate, Q/ (RcnL)
Qc_1=[0 4.82 4.74 4.62 4.33 3.99 3.59 3.37 pi];
fQR = csapi( S, Qc_1 );
% suppose ı took Sc=0.20 from the chart
Sc=0.20;
Qc = fnval(fQR, Sc);
end
ı want to calculate the flow variable by the specified input by user. for example when ı take l/d=1 and S=0.20 on the chart and then ı read by hand its almost 4.10. but when ı calculate with my code it gives different result. can you help me? where is my mistake? and how can ı wite a code for the calculate flow variable for the user specified S
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Alan Stevens
el 22 de Dic. de 2020
Use interp1, but get rid of inf (and possibly use more points!)
>> S=[0 0.00474 0.0188 0.0446 0.121 0.264 0.631 1.33 6];
>> Qc_1=[0 4.82 4.74 4.62 4.33 3.99 3.59 3.37 3.2];
>> Q = interp1(S,Qc_1,0.2)
Q =
4.1422
2 comentarios
Alan Stevens
el 23 de Dic. de 2020
The inf values you could replace with large, but finite values. How often are you likely to need those extremes?
For the two dashes you could interpolate using values of epsilon or (ho/c).
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