# Shared Flashcard Set

## Details

Evaluating Properties/Open Systems
N/A
19
Mechanical Engineering
03/19/2014

Term
 Thermodynamic State
Definition
 state that is identified by values of a suitable set of parameters known as state variables, state parameters, or thermo variables.
Term
 What are some state variables?
Definition
 Pressure, Temperature, density, specific internal energy, specific enthalpy, specific entropy.
Term
 What is the state principal phase rule?
Definition
 F = C - P + 2
Term
 Critical Temperature(T_c)?
Definition
 the max temperature at which a liquid and vapor phase can coexist in equilibrium
Term
 Critical Pressure (P_c)?
Definition
 Pressure at the critical point on a PVT plot.
Term
 T/F? In a 2 phase region temperature and pressure are independent of one another?
Definition
 FALSE
Term
 Compressed Liquid
Definition
 density varies little with pressure
Term
 Saturated Liquid
Definition
 Is 100% a liquid at its saturation temperature or saturation pressure
Term
 Saturated Vapor
Definition
 Is 100% a vapor at its saturation temp or saturation pressure.
Term
 mass quality equation
Definition
 x = mass of vapor/ (mass of vapor+mass of liquid)
Term
 Two phase region equations
Definition
 specific volume= (1-quality)(v_f)+(x)v_gu=(1-x)u_f+(x)u_g
Term
 enthalpy equation
Definition
 h = u + Pv
Term
 Incompressed Fluid approximation
Definition
 delta(h) = c*delta(T)+ specific volume*delta(P)change in enthalpy = "cat"+"vap"
Term
 Ideal gas approximation
Definition
 delta (u) = C_v*delta(T)*holds for both constant Volume/Pressure
Term
 Compressibility Chart eqn
Definition
 Z=Pv/RT v = specific volume*
Term
 Liquid/Solid/Ideal gas approximation
Definition
 * constant pressure/constant heat capacitydelta(h) = C_p*delta(T)change in enthalpy="cat"
Term
 Nozzle/Diffuser Eqn
Definition
 No Q, No W, No PE :h_out-h_in=0.5(V_out^2-V_in^2)
Term
 Throttle Eqn
Definition
 h_out=h_in*if no shaft work
Term
 Heat Exchanger Eqn
Definition
 m_1(h1_out-h1_in)=-m_2(h2_out-h2_in)* if no shaft work, negligible KE/PE
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