THERMODYNAMIC AND HEAT TRANSFER CONCEPTUAL AND VOCAB TEST 1 QUESTIONS AND ANSWERS

THERMODYNAMIC AND HEAT
TRANSFER CONCEPTUAL AND VOCAB
TEST 1 QUESTIONS AND ANSWERS
Biot Number - ANSWER-A dimensionless number used to represent internal resistance
of a body to heat conduction. Used to evaluate if lumped analysis will be effective.

Four Types of energy and which two make up thermal energy - ANSWER-- Nuclear
- Chemical
- Sensible *
- Latent *

Thermo vs Heat Transfer - ANSWER-Amount of energy/heat created vs Rate of energy
and heat created/transfered

2 forms of energy transfer for closed system - ANSWER-- heat
- work

3 forms of energy transfer for open system - ANSWER-- Mass Flow
- Heat
- Flow Work

1st Law of Thermo - ANSWER-Energy is conserved
delta E_sys = E_in - E_out
or
dE_sys/dt = rate_E_in - rate_E_out

Fourier's Law - ANSWER-Qdot = -k*A*dT/dx = -k*A*dT/L

Thermal Diffusivity - ANSWER-Thermal Conductivity divided by density and specific
heat at constant p

Forced or Natural convection, which has higher heat transfer coefficient - ANSWER-
Forced convection has higher coefficient because constantly moving air gets replaced
and the temperature gradient is greater

Doesn't require a medium only line of sight - ANSWER-Why is radiation special

- Temperature at specific spot
- - ANSWER-Common boundary conditions

- Surface Roughness
- Material Properties