View the step-by-step solution to:


When filling the combustion tank, one often thinks of adding the oxidizer (air or oxygen)

first and the fuel

(say methane) second. In fact, the characteristic diffusion time is

surprisingly long. Show this assuming the combustion tube is 10 m long, 1m in diameter.

For simplicity assume the tube is full of methane for 5 m and the balance is air for 5m.

  • Assume that the pressure is 60 bar and the diffusivity of CH4 -air is D = 10-5 m2/s at

p = 1 bar. What is the characteristic time for diffusive mixing?

My answer is coming (t= 0.000000613 s)

I dont know if its correct

Recently Asked Questions

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.


Educational Resources
  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question
Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes