سال انتشار: ۱۳۸۵

محل انتشار: چهاردهمین کنفرانس سالانه مهندسی مکانیک

تعداد صفحات: ۹

نویسنده(ها):

Kermani – Assistant Professor, Department of Mechanical Engineering Amirkabir University of Technology (Tehran Polytechnic)
Zayernouri – Graduate Student Department of Mechanical Engineering Amirkabir University of Technology (Tehran Polytechnic)
Saffar-Avval – Professor Department of Mechanical Engineering Amirkabir University of Technology (Tehran Polytechnic)

چکیده:

A new thermodynamic chart for isentropic expansion of compressible steam flow is developed. The steam is assumed to obey local equilibrium thermodynamic model,
where condensation onsets as soon as the saturation line is crossed at “c.o.”. Above the “c.o.”, the stagnation properties reflect those at inflow. However, beyond the “c.o.”, the transfer of latent heat toward the vapor portion of the two-phase
mixture, rises its stagnation temperature. A non-dimensional function “zeta”, is defined, which represents the increase in
vapor stagnation temperature. The vapor is assumed to be an actual gas obeying the “Lee-Kesler” EOS.