How far will the hot gases expand?

[Muzzleloading]

I’m designing a muzzleloader. How far will the hot gases from a 0.06” hole expand? I’m not talking about the reach of the jet, but the expansion of the jet (look at the picture). And just for curiosity, how far will the jet travel?

 

[Davey Boy]

I have heard even Superman is unable to hold back expanding gas.

On one of my brass cannons, black powder cut a line in the fuse hole like an oxy-acetylene torch

In my steel cannon, I put in a percussion cap nipple

I frequently use more powder than normal and the fire that comes out the touch hole is fierce

But I can't answer your question

 

[plmeek]

You need to solve

• a physics problem--Ideal Gas Law
• a chemical reaction problem-- KNO3 + S + C = K2S + CO2 + N2
• and a thermodynamics problem--the chemical reaction is an exothermic reaction and provides the energy (temperature) for the Ideal Gas Law

All these problems need to be solved simultaneously and as a function of time.

If there is a rocket propulsion engineer on here, they may be able to work it out for you.

I remember working similar problems in college, but I'm 45 years away from those days and don't remember enough of the details to work it out.

 

[Davey Boy]

I would drill a hole in a piece of wood, the size of a barrel you want.

Slide the wood down the barrel until the edge of the 0.06" hole is at the edge of the wood and light it off safely

The jet will burn the wood and leave you a template of distance and temperature

 

[deerstalkert]

Hot dawg! another experiment to keep from having to split wood or wash dishes.!!!!!!!!!!!!!!!!!!!!!!! oops! i see momma coming. gotta go!
i should think it would be dependent on the charge and on the back pressure in the barrel. ie. the ball. bullet etc.

 

[SDSmlf]

I’m designing a muzzleloader. How far will the hot gases from a 0.06” hole expand? I’m not talking about the reach of the jet, but the expansion of the jet (look at the picture). And just for curiosity, how far will the jet travel?

What is the temperature and velocity of your hot gas? At what temperature do you no longer consider the gases a jet? You have some basic testing to do first. Guessing your propellant/heat source will be blackpowder. Do you know the deflagration rate of your powder? Probably should start your testing to understand that, then move on to measuring the pressure wave from detonation. Not sure how best to measure.

 

[Pete G]

It will go at least 30". I've been sprayed before.

 

[Whughett]

At a range session this morning. Granddaughter in next firing bay, on my right 6 feet maybe was getting “dusted” with ???, 44 cap and ball revolver.
After a bit she shot a few rounds thru the same gun with me now in her spot. True enough at every shot I could feel light impacts on my-bare arm and a bit of concussion on the chest. The concussion obviously from muzzle blast but the the debris were from the cap area. I could see the cap fire and assume part was blow back from the flash hole, which effectively flowers the cap.
In this case the “jet” had become a cloud.

 

[Muzzleloading]

Was watching this gentleman demonstrate the escaping gas from a revolver cylinder.

So my question is not regarding the jet really, because the jet will be directed away, but the expansion of the gas surrounding the jet. (The jet question was just out of curiosity).

Take a look at this picture


perhaps it expands more like this though?


And yes, I will use pyrodex and black powder.

 

[springfield art]

I’m designing a muzzleloader. How far will the hot gases from a 0.06” hole expand? I’m not talking about the reach of the jet, but the expansion of the jet (look at the picture). And just for curiosity, how far will the jet travel?

 

[springfield art]

If you're talking about good old fashioned Southwestern Chili, they expand as far as the expandible band on your shorts!

 

[Woody Morgan]

If you're talking about good old fashioned Southwestern Chili, they expand as far as the expandible band on your shorts!

That's why men don't wear pantyhose. We'd blow our feet off.

wm

 

[JBrandon]

All the physics and chem calculations would be interesting, but a more practical way to solve your immediate problem is a series of simple tests with paper or other markers at changing distances.

 

[Pete G]

You will not put your thumb in the wrong place but once!!!

 

[deerstalkert]

create a ribbon tree above your gun. vid it as you shoot under the ribbons. you will know how far the expansion goes when the ribbons don't flutter.
or find your brother in law and ask him to stand at different points!

 

[deerstalkert]

better yet , i will loan you my brother in law. he is 6'8" . will give you a taller target

 

[ML48]

You need to solve

• a physics problem--Ideal Gas Law
• a chemical reaction problem-- KNO3 + S + C = K2S + CO2 + N2
• and a thermodynamics problem--the chemical reaction is an exothermic reaction and provides the energy (temperature) for the Ideal Gas Law

All these problems need to be solved simultaneously and as a function of time.

If there is a rocket propulsion engineer on here, they may be able to work it out for you.

I remember working similar problems in college, but I'm 45 years away from those days and don't remember enough of the details to work it out.

Hey, since when did muzzleloading become "Rocket Science"?

 

[ML48]

That's why men don't wear pantyhose. We'd blow our feet off.

wm

Unfortunately, in today's age, there are a lot of so-called males not only wearing panty hose, but makeup too!!

 

[Grenadier1758]

Hey, since when did muzzleloading become "Rocket Science"?

Maybe not rocket science, but ballistic science.