a question about conical flame.

Chemistry and homework help forum.

Organic Chemistry, Analytical Chemistry, Biochemistry, Physical Chemistry, Computational Chemistry, Theoretical Chemistry, High School Chemistry, Colledge Chemistry and University Chemistry Forum.

Share your chemistry ideas, discuss chemical problems, ask for help with scientific chemistry questions, inspire others by your chemistry vision!

Please feel free to start a scientific chemistry discussion here!

Discuss chemistry homework problems with experts!

Ask for help with chemical questions and help others with your chemistry knowledge!

Moderators: expert, ChenBeier, Xen

Post Reply
rezvane
Newbie
Newbie
Posts: 1
Joined: Wed Aug 07, 2013 1:17 pm

a question about conical flame.

Post by rezvane »

Hey everyone,

A stoichiometric fuel-air mixture flowing in a Bunsen burner forms a well-defined conical flame. The mixture is then made leaner. For the same flow velocity in the tube, how does the cone angle change?


Thanks in advance :)
GrahamKemp
Distinguished Member
Distinguished Member
Posts: 398
Joined: Mon Mar 19, 2012 10:12 pm

Re: a question about conical flame.

Post by GrahamKemp »

A leaner mixture means a narower base to the cone - thus a smaller cross sectional area; a circle measured by radius.

Code: Select all

A = π r{2}
.

Flow rate is measured as volume per time unit.

For a cone, volume is measured as

Code: Select all

V = π r{2} h/3
.

Hence if the same volume is flowing through a narrower base, the height of the cone will be pushed up; it will be inversely proportionate to the square of the radius.

If the height is pushed up so as the radius decreases, then the appeture will become accuter.

Code: Select all

 tan(θ/2) = r/h
Palphysiotherapy
Newbie
Newbie
Posts: 1
Joined: Thu Oct 03, 2013 3:10 pm
Location: SCO-1&2,NEAR VISHAL MEGA MART,Sector-14, Gurgaon,haryana (INDIA)
Contact:

how does the cone angle change?

Post by Palphysiotherapy »

Because volume flow in tube is in same ratio so height of the tube increase.
User avatar
osteorehab
Newbie
Newbie
Posts: 2
Joined: Thu Sep 30, 2021 2:47 am
Location: Gurgaon, India
Contact:

Re: a question about conical flame.

Post by osteorehab »

What is Laminar Premixed Flames and Burning Velocity

Physiotherapist in Gurgaon
Post Reply