Entropy Variation 2.4.7.2 | Duke University

University:
Duke University
Course:
PHYSICS 363 | Thermal Physics
Academic year:

2023
Views:

449

Pages:

2
Author:

Pemuda H

Entropy Vanation 2.4.7.2 dq-Sw+de Tas = pdr + du ds = Fav + = ar + a(u=1/2) (7/2)= dr-÷a (pr) + (u+Pr) of dr+ = dr+ d(u+Plp) =÷(par-d(pv))+Cp+ = =[par-par-rap] + Cp pv=RT= ds=-dp+Cpz-s,=Cpin ()-Rin() TEST NEXT WED (problems will be put online) updated notes If Isentropic: const and finally r=const Ex 2.4.3: Tp. (a) 45=0 FIND T ha 22 RY (b) 4570 (a) Know Ti and s, so state one is covered (tables) Find T (b) AS = Rin[(/)] e R= = AS Ex 2.4.4 T = 288 K P=1.01337 bar Cp-1.004 8-1.4 R= 0.287 Spor 6.6608 kg.k Looking at Tables... T2 Sz-S, Cp in Rin 11 P but T₂=T, So..... 1.0/337 PROBLEMS P-1.01387 bar P=Ibar Sp= S, Spez-Rin 1.01337 Keep all four digits for entropy (1) Turbofan Tc-300K BPR-8- CV pic MH TH=900K Draw CV Mass Conservation (steady flow) Energy Conservation. At<<0 < is more significant p(h+2+92) vñdo 0=-mche-mahn mm hm BPRhc+hn (BPR)hm BPR BPR+, Tc + BPR+1 = W, Tc + W₂ Th and w, + W₂ = 1