Flashcards in Module 1 Deck (30):
What is the 1st law of TD
Conservation of Energy - Energy cannot be created or destroyed
What is the second law of TD
Entropy can be created but not destroyed
Whats the difference between Classical and Statistical TD
Classic: Engineering (macroscopic)
Stastical: Average behaviour of particles (microscopic)
What are the two types of non mass energy transfers
Work and Heat
What is heat transfer?
Energy transfer due to temperature difference
What is the 0th law of TD
if SYS A and SYS B are in equilibrium with SYS C they are in equilibrium with eachother
What are the three types of Heat transfer modes
Conduction (Stationary Medium), Radiation (EM waves), Convection (Fluid)
What is the difference between the 'd' and delta symbols
d: small change in a property
delta: small quantity being added or removed
What are the two types of SYS
CM: Controlled Mass
CV: Controlled Volume
What is a CV system
fixed sized system. m,Q,W may transfer across boundary. Boundary usually fixed but may move (keeping volume constant)
What is CM system?
specific amount of matter. No m transfer across the boundary, but W and Q still possible. Boundary often changes
What is an isolated system?
No transfers across boundaries
What is the difference between extensive and intensive properties
extensive: dependent on amount of matter, intensive: independent on amount of matter (paper test)
What is a Pure Substance
uniform chemical composition throughout substance. phase may vary
What is a state equation?
EQ used to relate TD properties (Pv = RT)
What is Internal Equilibrum?
In internal balance, no observable macroscopic changes within the system
What is TD Equilibrium
All properties are in balance, no gradients exist.
What is a FT process
process occurs over a set amount of time
What is a Brief Moment process
A small instant in a FT process (deals with dE, dW etc). Integrating Brief Moment processes yields FT processes.
What is Rate Analysis?
Use Rate balance EQs (dE = dQ- dW)
What is a Quasi Equilibrium Process
process proceeds slowly enough that internal equilibrium is maintained
What is a process path
Describes a process state at every instant in the process
What is a process cycle
A sequence of processes where a CM Sys returns to its original state at the end
What is Steady State(SS)
state of Sys does not vary with time
What is a SF system
Flows in and out of a system are constant
What is the general form of a FT Balance Eq?
(B2 - B1) = (Badded + Bgen) - (Bremoved + Bdestroyed)
what is the general form of a Rate Balance EQ
dB/dt = (dBadded/dt + dBgen/dt) - (dBremoved/dt + dBdestroyed/dt)
What is the general mass balance equation
m1->2 = madded - mout. for CM, m1->2 = 0
What is the general Energy Balance eq
E1->2 = Ein - Eout