### No More Worries!

Our orders are delivered strictly on time without delay

### Paper Formatting

• Double or single-spaced
• 1-inch margin
• 12 Font Arial or Times New Roman
• 300 words per page

### No Lateness!

Our orders are delivered strictly on time without delay

### Our Guarantees

• Free Unlimited revisions
• Guaranteed Privacy
• Money Return guarantee
• Plagiarism Free Writing

# Stoichiometric

In combustion of CO in moist air, the following reaction mechanism describes
the initial stages of the reaction,
CO + O2
→ CO2 + O [23]
O + H2
O → OH + OH [11b]
OH + CO → CO2 + H [21]
H + O2
→ OH + O [4]
Assuming that O and H are in quasi-steady-state, derive an expression for [OH]
as a function of time in terms of [CO] and [O2] and the rate coefficients for the
above reactions. During the initial stages of the reaction, assume that T ≈ constant
and [CO] and [O2] ≈ constant and equal to the initial concentrations. Using this
result, write an expression for d[CO2]/dt. Is the reaction explosive (i.e., does the
rate of formation of products increase exponentially in time)? In the absence of
water vapor, is the reaction explosive? I.e., there are no [11b], [21], [4] reactions.
You only have [23] reaction.

1. For a stoichiometric CH4-air flame at 1 atm, the flashback velocity gradient is
400 s-1, and the flame thickness is 1 mm. For, this problem, the answer does not
have to be accurate. You can utilize scaling relations between properties.
a) Estimate the laminar flame speed of this mixture in cm/s.
b) What is the approximate burner diameter to prevent flashback?
c) If the overall order of the one-step global reaction is 1.3 (i.e., n = 1.3), what is
the critical flashback velocity gradient at 10 atm?
d) If the maximum turndown ratio of a stoichiometric CH4-air flame at 1 atm is
5, what is the blow-off velocity gradient at 1 atm?

Sample Solution

### 12% Discount

• Research Paper Writing
• Essay Writing
• Dissertation Writing
• Thesis Writing

### Why Choose Us

• Money Return guarantee
• Guaranteed Privacy
• Written by Professionals
• Paper Written from Scratch
• Timely Deliveries
• Free Amendments