A gas consisting of 20% CO 2 and 80% oxygen and nitrogen leaves a lime kiln at 2000 F and enters a..

A gas consisting of 20% CO2 and
80% oxygen and nitrogen leaves a lime kiln at 2000F and enters a
square duct measuring 6 in. by 6 in. in cross section. The specific heat of the
gas is 0:28 Btu/lbm F, and it is to be
cooled to 1000F in the
duct, whose inside surface is maintained at 800F, and whose walls
have an emissivity of 0.9. The mass velocity of the kiln gas is 0:4 lbm/ft2s and the convective
heat-transfer coefficient between the gas and duct walls is 1:5 Btu/h ft2
F.

a.
»

A gas consisting of 20% CO2 and
80% oxygen and nitrogen leaves a lime kiln at 2000F and enters a
square duct measuring 6 in. by 6 in. in cross section. The specific heat of the
gas is 0:28 Btu/lbm F, and it is to be
cooled to 1000F in the
duct, whose inside surface is maintained at 800F, and whose walls
have an emissivity of 0.9. The mass velocity of the kiln gas is 0:4 lbm/ft2s and the convective
heat-transfer coefficient between the gas and duct walls is 1:5 Btu/h ft2
F.

a. Determine the required length of duct to
cool the gas to 1000F.

b. Determine the ratio of radiant energy
transfer to that by convection.

c. At what temperature would the gas leave
the duct if the length of the duct were twice the value determined in part (a)?

(Courtesy of the American Institute of
Chemical Engineers.)

Hint. As the response of the gas to
emission and absorption of radiant energy differs, an approximation for the
radiant energy exchange between the enclosure and gas contained within an
arbitrary control volume is given by

»

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more