List of topics for the 10/26/15 MEC 502 midterm
1. First law of thermodynamics: Is (1.30) as it is shown a governing equation,
i.e., does it determine the value of
shaft
W
?
2. Fouriers law of heat conduction
3. Heat conduction equation: equations (2.14)
MEC502: Homework #6
Problem 1(75pts): The following O.D.E describes the time evolution of temperature at
the center of a resistor (physical units are Kelvin and seconds)
= 3
2
2 + exp t
0 =0
(a) Find the solution using Laplace transform for C =0.01 Hz
i
Class assignment #9
The thermo bottle in the illustration contains water at 1 = 80 while the air outside the
bottle is at 2 = 10. The double glass walls of the bottle are coated with a reflective
material with emittance 1 = 2 = 0.01.
= 7cm
= 10cm
Heat i
Homework #7
2 = 200
2m
Problem 1
1m
The 3-surface enclosure is formed by 3 blackbodies emitting
radiation at steady temperature T1 , T2 and T3. The four
vertical walls forming surface 3 are perfectly insulated so
that q3 = 0
2.98 m 1) Find the net heat q1
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 4:
Part I: Lumped Analysis
Part II: Scaling Analysis
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Announcement
Grading: A/F
Item
Percentage
Final Examination
40%
M
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 1:
Introduction/Definitions/Basic Concepts
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Lecture 1: Introduction
Contact info
Office: 155 Light Engineering
Email: C
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 3:
Part I: Heat Conduction Equations
Part II: Lumped Analysis
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Lecture 2: Review
Heat (Q): Heat is a form of energy [J]
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 2:
Heat Conduction Equations
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Lecture 1: Review
What is Energy?
= + +
gas-liquid-solid
(Bulk Kinetic + Bulk Potential
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 5:
Part1: Direct integration of O.D.E. (1D Steady Conduction)
Part2: Similarity/Separation of variables (Unsteady)
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Ann
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 6:
Part1: Separation of variables
Part2: Fourier Series
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Announcement
Next Week - Monday October 20th 4PM
Midterm Exami
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 7:
Part1: Laplace transform
Part2: Heat Radiation
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Lecture 7 Part I:
Laplace Transform
Laplace Transform
Definition of
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 10:
Part1: Gray surface enclosures II
(non-participating media)
Part2: Radiation with participating media
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Announcement
Unsteady State Heat Transfer
HT3: Experimental Studies of Thermal Diffusivities and
Heat Transfer Coefficients
Transient Heat Conduction
Many heat conduction problems encountered in engineering applications
involve time as in independent variable. The go
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 9:
Part1: Black surfaces review
Part2: Real bodies and gray surface radiation
(non-participating media)
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Lecture 9: Rev
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 8:
Heat Radiation Equations
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Lecture 7: Review
EM radiation spectrum ,
Single atom
complex media spectrum
12
+
+
13
+
MEC 502
Conduction and Radiation Heat
Transfer
Lecture 11:
Part1: Radiation with participating media
Part2: Heat transfer with phase change
Final review
Prof. Carlos E. Colosqui
Mechanical Engineering Department
Stony Brook University
Announcement
Grading
Final Exam MEC502: Problem 1 (40pts)
A cubical reaction chamber containing a highly rarefied gas must operate under
conditions where the chamber walls (2) are at constant temperature T = 1000K . The
camber is heated by a spherical radiator (1) of radius =
Problem 1
A transistor of radius =6mm forms part of an integrated circuit
operating in air (constant) temperature = 35.
Consider all
physical properties of the transistor material are constant, the thermal
conductivity is = 80W/(mK) and the heat transfer
Homework #8: four gray surface enclosure
A duct of length L = 3m has a cross section formed by 4 plates as showed in the figure
below. Assuming diffuse gray surfaces, compute the heat flow 1 , 2 , 3 , and 4 in Watts
that must be supplied (or extracted) on
Homework #8: four gray surface enclosure
A duct of length L = 3m has a cross section formed by 4 plates as showed in the figure
below. Assuming diffuse gray surfaces, compute the heat flow 1 , 2 , 3 , and 4 in Watts
that must be supplied (or extracted) on
List of topics for MEC 502
1. One-dimensional heat conduction through a hollow cylinder
2. Thermal resistance concept: Example 3.2
3. One-dimensional, steady-state heat conduction with heat sources
4. Lumped heat capacity bodies: Example 6.1 and Problems
CHAPTERS 101
5.2 A small furnace consists of a cylindrical, black-walled enclosure, 20 cm long and T3 = 500K
with a diameter of 10cm. The bottom surface is electrically heated to 1500 K,
while the cylindrical sidewall is insulated. The top plate is expose
MEC502:Homework #2
Problem 1(50pts):
After performing experimental measurements we find that the temperature profile in a
thin flat plate is , , = 300 200 2 , where is the distance in meters from one
edge and the temperature is given in . The plate length