Thermodynamic Processes Flashcards
1
Q
Isothermal
A
•T= constant •/\U=0 (internal energy constant) •PV=constant •W= nRTlog(Vf/Vi) = nRTlog(Pf/Pi) •B=P •P-V curve is a Rectangular Hyperbola Molar heat capacity(Cv) =infinity
2
Q
Isochoric
A
- V=constant
- /\W=0
- /\U=/\Q
- P/T=constant
- P-V curve is a straight line parallel to Y-axis
- molar heat capacity =Cv
3
Q
Isobaric
A
- P = constant
- molar heat capacity = Cp
- /\U=nCv/\T
- W =nR/\T = P/\V
- P-V curve is a straight line parallel to X-axis
4
Q
Adiabatic
A
- /\Q=0
- /\U =-/\W
- molar heat capacity(C) =0
- On expanding system cools
- On contracting system heats up
- PV^y = constant
- TV^(y-1) = constant
- P^(1-y)T^y = constant
- W = (nR/\T)/(y-1) = (P1V1 - P2V2)/(y-1)
- y= adiabatic slope/isothermal slope
5
Q
Cyclic
A
•for a complete cycle
/\U=0
•Net heat = heat supplied + heat rejected
• Efficiency (n) = work done/heat supplied X 100
6
Q
In adiabatic compression the decrease in volume is associated with
A
Increase in temperature and pressure
7
Q
Heat energy is independent of the
A
State of the system
8
Q
Thermal resistance
A
Rthermal = l/KA
9
Q
When Slabs are connected in series the equivalent thermal conductivity constant =
A
Keq = (l1 + l2)/ (l1/K1 + l2/K2)
10
Q
When Slabs are connected in parallel the equivalent thermal conductivity constant =
A
Keq = (K1A1 + K2A2)/(A1 + A2)
