MECH 6120: Combustion
Notes on Chemical Kinetics and
Chain Reactions
1
By reaction rate, we mean
Rate =
change in moles of species
unit time unit volume
Since the number of moles per unit volume is equivalently a concentration C of the species, the reacti
MECH 6120: Combustion
Exam II Review Questions
1
Coupling Kinetics with Thermochemistry
1. Briey describe the basic assumptions involved in the wellstirred approximation for a reactor.
2. An adiabatic, wellstirred constant pressure reactor, of volume V =
MECH 6120: Combustion
Final Exam Review Questions
(a) Using the law of mass action, derive equations for
the rate of change of CO, O, and O3 concentration.
The test will be in a multiple choice/short answer format.
You may bring four pages (front and back
MECH 6120: Combustion
Coupling Kinetics with Thermodynamics
as the Biot number, and our solution would be valid providing that the
Biot number was small.
We want to do something similar here except expanded to include
chemical reactions within the system.
MECH 5120/6120: Combustion Homework: Due 22 September 1. Text problems 4.8, 4.14, and 4.15 (note that H and Br are radical species). 2. A lowtemperature chain mechanism proposed for the oxidation of CO in the presence of water vapor is as follows: k1 CO +
MECH 5120/6120 Combustion Homework Assignment: Due Date: 8 September 2009 1. Calculate the rate of heat transfer in problem 5 of the previous set. You can assume complete combustion and a constant specic heat of the product stream equal to value of air at
MECH 6120: Combustion Coupling Kinetics with Thermodynamics
At this point in the course, we have covered the topics of thermodynamics and chemical kinetics which are both fairly distinct topics (that is, one is not derived from the other). Our next item o
MECH 6120: Combustion Notes on Chemical Kinetics and Chain Reactions 1 Chemical Kinetics
By reaction rate, we mean Rate = change in moles of species unit time unit volume
Since the number of moles per unit volume is equivalently a concentration C of the s
MECH 6120: Combustion Notes on Diffusion Flames 1 Introduction
air fuel products fuel
Figure 1: A typical jet diffusion flame
O2 products
flame
2
Jet Diffusion Flames
In diffusion flames, the fuel and oxidizer are not mixed together prior to ignition. Ins
MECH 6120: Combustion Notes on Droplet Combustion
1
Pure Evaporation
The mass fraction of fuel in the liquid is Yf,l , and in the gas phase at the surface it is Yf,R . Note that Yf,l > Yf,R , i.e., there is a 'jump' in fuel mass fraction at the surface. I
Auburn University
Department of Mechanical Engineering
MECH 5120/6120/6126: Combustion
Fall 2009
Course Information
Instructor:
Oce:
Phone:
email:
Oce Hours:
Text:
Prerequisite:
Daniel W. Mackowski
Ross 344
4-3334 (W)
dmckwski@eng.auburn.edu
12:302:00 MWF
MECH 6120: Combustion Exam II Review Questions 1 Coupling Kinetics with Thermochemistry
1. Briey describe the basic assumptions involved in the wellstirred approximation for a reactor. 2. An adiabatic, wellstirred constant pressure reactor, of volume V =
MECH 6120: Combustion Homework: Due 8 October 2009 1. Acetylene (C2 H2 ) is burned with air in a wellstirred adiabatic reactor. The volume of the reactor is 0.05 m3 , the pressure is 1 atm (101.32 kPa), and the reactants enter at 298 K with an equivalence
MECH 6120: Combustion Final Exam Review Questions
The test will be in a multiple choice/short answer format. You may bring four pages (front and back) of notes in your own handwriting; otherwise the exam is closed book. Note that this contradicts what I s
MECH 5120/6120 Combustion Homework Assignment: 18 August 2009 Due Date: 25 August 1. Text problem 2.2 2. Text problem 2.9 3. Text problem 2.11 4. Text problem 2.12 5. A residential heater is supplied with 10 cc/sec of methane at 298 K, 1 atm, and the fuel
MECH 6120: Combustion
Homework Solutions: Chs. 8 & 9
8.1
Find the radial velocity of a laminar, spherical ame.
Assume that the burned gases are stationary (in the laboratory coordinate system), and that the ame
moves with respect to the stationary burned