Note that the entropy change of a truly

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: the substance over the given temperature interval. Note that the entropy change of a truly incompressible substance depends on temperature only and is independent of pressure. Equation 7–28 can be used to determine the entropy changes of solids and liquids with reasonable accuracy. However, for liquids that expand considerably with temperature, it may be necessary to consider the effects of volume change in calculations. This is especially the case when the temperature change is large. A relation for isentropic processes of liquids and solids is obtained by setting the entropy change relation above equal to zero. It gives Isentropic: s2 s1 Cav ln T2 T1 0 → T2 T1 (7–29) That is, the temperature of a truly incompressible substance remains constant during an isentropic process. Therefore, the isentropic process of an incompressible substance is also isothermal. This behavior is closely approximated by liquids and solids. cen54261_ch07.qxd 11/18/03 9:57 AM Page 294 294 FUNDAMENTALS OF THERMAL-FLUID SCIENCES EXAMPLE 7–7 Effect of Density of a Liquid on Entropy Liquid methane is co...
View Full Document

Ask a homework question - tutors are online