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Entropy equation plot 
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#1
Jun2512, 01:34 PM

P: 7

Hi everybody, I have a problem with this equation:
it represents the motion of a gas in a duct with friction (Fanno flow). I need to plot this function in a Ts plot, do you have any ideas? the Mach number changes along the curve... R=constant S_{2}S_{1}=R*(M^{2}1)*log(T_{2}/T_{1})$ 


#2
Jun2612, 11:37 AM

HW Helper
P: 1,391

What exactly do you want to plot? S_{2}S_{1} vs. T_{2}, or vs. T_{2}/T_{1}?
What variables does M (the Mach number?) depend on? Is it just a function of T? S and T? If it depends on both you'll need to do a contour plot. (The brute force way of doing a contour plot is basically to generate a grid of S and T points and then plot a point for every pair of values (T,S) that satisfy the equation). 


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