MECH 230 Study Guide - Quiz Guide: Mass Flux, Polytropic Process, Ideal Gas

• School: Queen's University
• Department: Mechanical and Materials Engineering Courses
• Course: MECH 230
• Professor: Gabriel Ciccarelli

Document Summary

Work by or heat to the system is positive. Work on or heat from the system is negative. Compressed liquids: if p is small, u(p,t) ~ uf(t) v(p,t) ~ vf(t) h(p,t) = hf(t) + vf(p-psat(t*)) Ideal gases z=pvrt; z=1 for ideal gas incompressible substances. Transient control volume analysis (1 inlet or 1 exit) ; for reservoir flow into rigid tank, initially a. Significant pressure drop. h1 = h2 (constant enthalpy) Clausius statement: it is impossible for a system to operate in such a way that the sole result is the transfer of heat from a cold to a hot body. Kelvin planck statement: it is impossible for a system that operates in a cycle to generate work while transferring heat with a single reservoir. Entropy (t-s diagram looks like p-v diagram (isobars w/ same direction)) Isentropic (adiabatic, closed, reversible): s isentropic = 0. Rate balance steady-state, one inlet and one outlet, isothermal cv: Gas temperature increases from tc to th.