STATE UNIVERSITY OF NEW YORK AT BUFFALO
DEPARTMENT OF MECHANICAL & AEROSPACE ENGINEERING
MAE 336, Heat Transfer (15075, 22230, 22231)
Professor Mollendorf, PhD, FASME (335 Jarvis)
Olga Wodo, PhD (125 Bell)
Class #
Day of
Week
Date
Chapter
Material
Spring
ENGR214
Chapter13
KineticsofParticles:
Energy&MomentumMethods
AllfigurestakenfromVectorMechanicsforEngineers:Dynamics,BeerandJohnston,2004
1
Work of a Force
Particle displacement:
dr
r
Work of force F corresponding
to displacement dr :
r r
dU F gdr
F d
ENGR214
Chapter13
KineticsofParticles:
Energy&MomentumMethods
AllfigurestakenfromVectorMechanicsforEngineers:Dynamics,BeerandJohnston,2004
1
Work of a Force
Particle displacement:
dr
r
Work of force F corresponding
to displacement dr :
r r
dU F gdr
F d
Radiation: Processes and
Properties
Surface Radiative Properties
Chapter 12
Emissivity
Surface Emissivity
Radiation emitted by a surface may be determined by introducing a property
(the emissivity) that contrasts its emission with the ideal behavior of a
Radiation: Processes and
Properties
Surface Radiative Properties
Chapter 12
Emissivity
Surface Emissivity
Radiation emitted by a surface may be determined by introducing a property
(the emissivity) that contrasts its emission with the ideal behavior of a
Radiation: Processes and
Properties
-Basic Principles and DefinitionsChapter 12
General Considerations
General Considerations
Attention is focused on thermal radiation, whose origins are associated
with emission from matter at an absolute temperature T 0
Radiation: Processes and
Properties
-Basic Principles and DefinitionsChapter 12
General Considerations
General Considerations
Attention is focused on thermal radiation, whose origins are associated
with emission from matter at an absolute temperature T 0
Radiation: Processes and
Properties
Surface Radiative Properties
Chapter 12
Emissivity
Surface Emissivity
Radiation emitted by a surface may be determined by introducing a property
(the emissivity) that contrasts its emission with the ideal behavior of a
Radiation: Processes and
Properties
-Basic Principles and DefinitionsChapter 12
General Considerations
General Considerations
Attention is focused on thermal radiation, whose origins are associated
with emission from matter at an absolute temperature T 0
Radiation Exchange Between Surfaces:
Enclosures with Nonparticipating
Media
Chapter 13
Basic Concepts
Basic Concepts
Enclosures consist of two or more surfaces that envelop a region of space
(typically gas-filled) and between which there is radiation tra
One-Dimensional, Steady-State
Conduction without
Thermal Energy Generation
Chapter Three
Methodology
Methodology of a Conduction Analysis
Specify appropriate form of the heat equation.
Solve for the temperature distribution.
Apply Fouriers law to determin
STATE UNIVERSITY OF NEW YORK AT BUFFALO
DEPARTMENT OF MECHANICAL & AEROSPACE ENGINEERING
MAE 336, HEAT TRANSFER
*
April 8, 2015
EXAM 2 Booklet A1
*
Question sheets must be turned-in with answer sheet.
Open book/notes.
Extra time is not allowed to fill-
STATE UNIVERSITY OF NEW YORK AT BUFFALO
DEPARTMENT OF MECHANICAL & AEROSPACE ENGINEERING
MAE 336, HEAT TRANSFER
*
May 6, 2015
EXAM 3 Booklet 1
*
Question sheets must be turned-in with answer sheet.
Open book/notes.
Extra time is not allowed to fill-out bu
PROBLEM 5.44
KNOWN: One-dimensional wall, initially at a uniform temperature, Ti, is suddenly exposed
to a convection process (T , h). For wall #1, the time (t1 = 100s) required to reach a specified
temperature at x = L is prescribed, T(L1, t1) = 315 C.
F
PROBLEM 5.27
KNOWN: Dimensions and operating conditions of an integrated circuit.
FIND: Steady-state temperature and time to come within 1 C of steady-state.
SCHEMATIC:
ASSUMPTIONS: (1) Constant properties, (2) Negligible heat transfer from chip to
substr
STATE UNIVERSITY OF NEW YORK AT BUFFALO
DEPARTMENT OF MECHANICAL & AEROSPACE ENGINEERING
MAE 336, Heat Transfer (15075, 22230, 22231)
Professor Mollendorf, PhD, FASME (335 Jarvis)
Olga Wodo, PhD (125 Bell)
Class #
Day of
Week
Date
Chapter
Material
Spring
PROBLEM 4.33
KNOWN: Igloo constructed in hemispheric shape sits on ice cap; igloo wall thickness and inside/outside
convection coefficients (hi, ho) are prescribed.
FIND: (a) Inside air temperature T,i when outside air temperature is T,o = -40C assuming o
PROBLEM 4.53
KNOWN: Volumetric heat generation in a rectangular rod of uniform surface temperature.
FIND: (a) Temperature distribution in the rod, and (b) With boundary conditions unchanged, heat
generation rate causing the midpoint temperature to reach 6
PROBLEM 3.98
KNOWN: Radii and thermal conductivities of reactor fuel element and cladding. Fuel heat generation
rate. Temperature and convection coefficient of coolant.
FIND: (a) Expressions for temperature distributions in fuel and cladding, (b) Maximum
PROBLEM 3.3
KNOWN: Temperatures and convection coefficients associated with air at the inner and outer surfaces
of a rear window.
FIND: (a) Inner and outer window surface temperatures, Ts,i and Ts,o, and (b) Ts,i and Ts,o as a function of
the outside air
PROBLEM 2.42
KNOWN: Coal pile of prescribed depth experiencing uniform volumetric generation with
convection, absorbed irradiation and emission on its upper surface.
FIND: (a) The appropriate form of the heat diffusion equation (HDE) and whether the presc
PROBLEM 2.8
KNOWN: Temperature dependence of the thermal conductivity, k(T), for heat transfer through a
plane wall.
FIND: Effect of k(T) on temperature distribution, T(x).
ASSUMPTIONS: (1) One-dimensional conduction, (2) Steady-state conditions, (3) No i
PROBLEM 1.18
KNOWN: Hand experiencing convection heat transfer with moving air and water.
FIND: Determine which condition feels colder. Contrast these results with a heat loss of 30 W/m2 under
normal room conditions.
SCHEMATIC:
ASSUMPTIONS: (1) Temperatur
PROBLEM 1.33
KNOWN: Exact and approximate expressions for the linearized radiation coefficient, hr and hra,
respectively.
FIND: (a) Comparison of the coefficients with = 0.05 and 0.9 and surface temperatures which may
exceed that of the surroundings (Tsur
STATE UNIVERSITY OF NEW YORK AT BUFFALO
DEPARTMENT OF MECHANICAL & AEROSPACE ENGINEERING
MAE 336, HEAT TRANSFER
*
February 27, 2015
EXAM 1 Booklet A1
*
Question sheets must be turned-in with answer sheet.
Open book/notes.
Extra time is not allowed to f
Heat Transfer:
Physical Origins
and
Rate Equations
Heat Transfer and Thermal Energy
What is heat transfer?
Heat transfer is thermal energy in transit due to a temperature
difference.
What is thermal energy?
Thermal energy is associated with the translat
Transient Conduction:
The Lumped Capacitance Method
Chapter Five
Transient Conduction
Transient Conduction
A heat transfer process for which the temperature varies with time, as well
as location within a solid.
It is initiated whenever a system experien
PROBLEM 7.75
KNOWN: Sphere with a diameter of 20 mm and a surface temperature of 60C that is immersed in a
fluid at a temperature of 30C with a velocity of 2.5 m/s.
FIND: The drag force and the heat rate when the fluid is (a) water and (b) air at atmosphe
PROBLEM 7.52
KNOWN: Pin fin of 10 mm diameter dissipates 30 W by forced convection in cross-flow of air with
ReD = 4000.
FIND: Fin heat rate if diameter is doubled while all conditions remain the same.
SCHEMATIC:
ASSUMPTIONS: (1) Pin behaves as infinitely
PROBLEM 9.87
KNOWN: Temperatures and dimensions of a window-storm window combination.
FIND: Rate of heat loss by free convection.
SCHEMATIC:
ASSUMPTIONS: (1) Both glass plates are of uniform temperature with insulated
interconnecting walls and (2) Negligi
PROBLEM 6.26
KNOWN: Critical Reynolds number for a cylinder in cross flow. Critical Mach number.
FIND: Critical cylinder diameter below which, if the flow of air at atmospheric pressure and
temperature is turbulent, compressibility effects may be importan
Test Version: A
STATE UNIVERSITY OF NEW YORK AT BUFFALO
DEPARTMENT OF MECHANICAL & AEROSPACE ENGINEERING
MAE 336, HEAT TRANSFER
*
April 6, 2016
EXAM 2 Version A
*
Question sheets, your homework solutions and two sided note
MUST be turned-in with answer
Test Version: A
STATE UNIVERSITY OF NEW YORK AT BUFFALO
DEPARTMENT OF MECHANICAL & AEROSPACE ENGINEERING
MAE 336, HEAT TRANSFER
*
May 4, 2016
EXAM 3 Version A
*
Question sheets MUST be turned-in with answer sheet.
Extra time is not allowed to fill-out b