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Homework Statement
I have question on entropy for which I have no idea about, please help me out...
a) Change of entropy of a gas is given with usual notations by:
s2-s1=cvln(T2/T1)+Rln(V2/V1)
using this relationship, show that for a polytropic process, entropy change can be expressed as:
s2-s1=cv(n-k/n-1)ln(T2/T1)
b) In an air turbine air expands from 7bar and 460°C to 1.012bar and 160°C. This process can be assumed as a polytropic process. Determine,
1) Whether the flow is reversible or irreversible
2) The net entropy change per unit mass of air.Please give me a step wise calculation on how to arrive at the answers 'cos I'm so weak in entropy. Additionally I would appreciate if someone can give me links for a site where I can bring my entropy knowledge up to level 'cos, even though I understand the Clausis inequality and the derivation of entropy property, I'm at a loss on how to apply it in a question such as this...
Homework Equations
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The Attempt at a Solution
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