## a question about conical flame.

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rezvane
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Joined: Wed Aug 07, 2013 1:17 pm

### a question about conical flame.

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?

GrahamKemp
Distinguished Member
Posts: 398
Joined: Mon Mar 19, 2012 10:12 pm

### Re: a question about conical flame.

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 = Ï€ r&#123;2&#125;
.

Flow rate is measured as volume per time unit.

For a cone, volume is measured as

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V = Ï€ r&#123;2&#125; 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.

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 tan&#40;Î¸/2&#41; = r/h
Palphysiotherapy
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### how does the cone angle change?

Because volume flow in tube is in same ratio so height of the tube increase.
osteorehab
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### Re: a question about conical flame.

What is Laminar Premixed Flames and Burning Velocity

Physiotherapist in Gurgaon