ACCURATE SOLUTIONS AND EMPIRICAL RELATIONS FOR INVISCID-DIABATIC AND VISCOUS-ADIABATIC ONE-DIMENSIONAL FLOWS OF REAL STEAM

The inviscid-diabatic (Rayleigh) and the viscous-adiabatic (Fanno) one -dimensional flows of real steam are studied using the accurate state equation of H2O proposed by Saul-Wagner in comparison to that of Redli ch-Kwong. The accurate results describing the Fanno and Rayleigh curve s are approximated by explicit empirical relations which have mathemat ical forms similar to the ideal gas equations of the Rayleigh and Fann o curves, but with new coefficients and exponents numerically calculat ed [1-4]. (see (1) Kouremenos, D. A; and Kakatsios, X. K., Forschung i m Ingenieuresen, 1985, 51, 169-174; (2) Kouremenos, D. A. and Kakatsio s, X. K., BWK 37, 1985, 263-265; (3) Kakatsios, X. K., Acta Mechanica, 1995, 110, 185-197; (4) Kakatsios, X. K. and Houzouris, G. E., Archiv e of Applied Mechanics, 1995, 65, 217-226.) (C) 1998 Elsevier Science Ltd. All rights reserved.