Most control volumes encountered in practice such as

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Unformatted text preview: fer, the net rate of entropy transfer into the control volume by mass flow, and the rate of entropy generation within the boundaries of the control volume as a result of irreversibilities. Most control volumes encountered in practice such as turbines, compressors, nozzles, diffusers, heat exchangers, pipes, and ducts operate steadily, and thus they experience no change in their entropy. Therefore, the entropy balance relation for a general steady-flow process can be obtained from · Eq. 7–83 by setting ∆S CV 0 and rearranging to give Steady-flow: · Sgen · m ese · Qk Tk · m isi se > si (7–84) For single-stream (one inlet and one exit) steady-flow devices, the entropy balance relation simplifies to Steady-flow, single-stream: si FIGURE 7–64 The entropy of a substance always increases (or remains constant in the case of a reversible process) as it flows through a single-stream, adiabatic, steady-flow device. · Sgen · m (se si) · Qk Tk (7–85) For the case of an adiabatic single-stream device, the entropy balance relation further sim...
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