Bagdanavicius Flashcards
What is an isothermal process?
A process during which the temperature remains constant
What is an isobaric process?
A process during which the pressure remains
constant
What is an isochoric process?
A process during which the specific volume remains
constant
What is a cycle?
A process during which the initial and final states are identical
What is the zeroth law of thermodynamics?
If two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other
What is the definition for heat?
The form of energy interaction between two systems or a system and its surroundings due to temperature difference
Qin and Wout, of a system are?
Positive
Qout and Win, of a system are?
Negative
What is the equation for energy balance?
(Total energy entering) - (Total energy leaving) = (Change in the total energy)
What is saturation temperature?
The temperature at which a pure substance changes phase at a given pressure
What is saturation pressure?
The pressure at which a pure substance changes phase at a given temperature
What is the equation of state for an ideal gas
Pv = RT
For expansion, is boundary work positive or negative?
Positive
For compression, is boundary work positive or negative?
Negative
For polytrpoic process’, what is the equation for boundary work?
P2V2 - P1V1/ 1-n
Where n is the heat ratio = Cp/Cv
For isothermal process’, what is the equation for boundary work?
PVln(V2/V1)
n = 1
For isobaric process’, that is the equation for boundary work?
Po(V2-V1)
What is the specific heat at constant volume? (Cv)
The energy required to raise the temperature of the unit mass of a substance by one degree as the volume is maintained constant
What is the specific heat at constant pressure? (Cp)
The energy required to raise the temperature of the unit mass of a substance by one degree as the pressure is maintained constant
What is Cv related to? And what is the equation?
The change in internal energy with temperature, at a constant volume
Cv = (du/dT)v
What is Cp related to? And what is the equation?
The change in enthalpy with temperature, at a constant pressure
Cp = (dh/dT)p
What is the equation for enthalpy?
h = u + Pv
For real gases, why do their specific heat only depend on temperature?
At low pressures, all real gases approach ideal-gas behaviour
What is the equation for the specific heat ratio?
Cp/Cv
What is the conservation of mass principle for a control volume? (2)
Min - Mout = dMcv
M:in -M:out = dMcv/dt
What is the Mass Balance for Steady-Flow Processes?
M:in = M:out
What is the equation for flow work?
Wflow = Pv P = pressure, V = volume
What is a nozzle?
A nozzle is a device that increases the velocity of a
fluid at the expense of pressure
What is a diffuser?
A diffuser is a device that increases the pressure of
a fluid by slowing it down
