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# Quiz2 - PROBLEM 5-56 KNOWN Steam in a steady~state...

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Unformatted text preview: PROBLEM 5-56 KNOWN: Steam in a steady~state, steady—ﬂow process enters a nozzle with a velocity 0f 5‘ pressure of 1.2 MPa, and a temperature of 400°C. The steam leaves the nozzle: pressure of 0.4 MPa. FIND: Compute the nozzle exit velocity if: (a) The process is reversible and adiabatic. (b) The nozzle efﬁciency is 95%, where: nn = \$1992]— Ahisentropic CHEMATI C: V1 V2 Steam 7 —> ASSUMPTIONS: PRQPERTIES; Steam @ P1 = 1.2 MP8, T1 = 400°C from Table (A-1.3) h] = 3260. _ s1 = 7.377 ANALYSIS: (a) Since the process is adiabatic and reversible: 31 = 32 Steam @ P2 = 0.4 MPa, 52 = 31 = 7.3774 from Table (A-l.3) via intc . _ 7.3774 — 7.1706 . _ 2 hz - 2860.5 +(7.3789 _ 7.1706) (2964.2 2860.5) 2963.45 For a SSSF process with W = 0 ; Q = 0 E _ 1/2_3 . 5.02. - V. 22 61 + 2 412 + 2 , 3260.7 + 2000 _ 2963.4 + 2000 v2 = V(2000)-3261.95 - 29634 = 772.7 m/s <=<= ‘ (b) Ahs = 3260.7 - 2963.45 = 297.25 Ahact = (095)-(29725) = 282.39 2 . V2 = 282.39 + 513 = 283.64; a.-. v2 = 753.2 m/s <=¢= 2000 2000 ...
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