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Unformatted text preview: Lecture # 10 Properties 9/17/08 I deal Gas Model An ideal gas equation of state is an appr oximation to the actual equation of state (with compr essibility char t). For an ideal gas model, pv = RT This implies Z = 1, wher e Z = compr essibility factor . R is the specific gas constant, r elated to the univer sal gas constant as The idea gas r elations can be wr itten in differ ent ways: pV = mRT; m = mass in kg, V = volume in m 3 pV = n M R T, n = number of moles, M = molecular weight. M R R / = Reduced pressure and temperature Reduced pr essur e = p/p cr it Reduced temper atur e = T/T cr it Fig03_12 Fig03_12 Virial equation of State Z can be computed fr om a infinite ser ies expansion in pr essur e or specific volume, as: The coefficients B, C ar e called vir ial coefficients, and the above equations ar e called the vir ial equations of state. ..... ) ( ) ( ) ( ... ) ( ) ( ) ( + + + + = + + + + = 3 2 3 2 1 1 v T D v T C v T B Z p T D p T C p T B Z I deal Gas Model The definitions of inter nal ener gy and enthalpy simplify for an ideal gas model. For ideal gases, it is obser ved empir ically that the inter nal ener gy depends only on temper atur e....
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This note was uploaded on 09/16/2009 for the course ME ME300 taught by Professor Vanka during the Spring '09 term at University of Illinois at Urbana–Champaign.
 Spring '09
 Vanka

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