Could Someone W/ a bettter understanding of Phisics explaine this to me?

[Micah]

This is from the Merriam-Webster dictionary ....
Main Entry: ven·tu·ri
Pronunciation: ven-'tur-E
Function: noun
Etymology: G. B. Venturi died 1822 Italian physicist
Date: 1887
: a short tube with a tapering constriction in the middle that causes an increase in the velocity of flow of a fluid and a corresponding decrease in fluid pressure and that is used especially in measuring fluid flow or for creating a suction (as for driving aircraft instruments or drawing fuel into the flow stream of a carburetor)

So ... uh ... wouldn't this increase velocity and decrease operating pressure? What am I missing? why doesn't it really work that way? Ahhhhh stupid phisics ... I didn't mean that ...

-Micah

 

[jynxfactor]

your partialy right, with a venture bolt you need to increase presure to attain the same velocity of say the stock bolt.

The venture bolt was designed to give a gentler and more evenly dispersed blast of air to the paintball. This was suposed to decrease ball breakes in the barrel, and theoreticaly give better accurace by decreasing the amount of turbulace in the air behind the ball.

 

[Micah]

but by definition it's a short tube with a tapering constriction in the middle that causes an increase in the velocity of flow of a fluid and a corresponding decrease in fluid pressure and that is used especially in measuring fluid flow or for creating a suction (as for driving aircraft instruments or drawing fuel into the flow stream of a carburetor)

So ... uh ... wouldn't this increase velocity and decrease operating pressure? Or does it only apply to liquids?

-Micah

 

[jynxfactor]

If the air passing through the tube was a constant. Since it's just a quick burst from the valve air gets to the constriction in the tube.

This increases the speed of the particals (air) but restricts the volume at the same time so it takes longer for the air to pass out of the valve chamber and into the barrel. So yes it will increase the velocity of the particals traveling but the constriction will limmit the speed that the total volume of air can ecape.

This means that you need to increase the totel volume of air released (increase the presure) to maintain the same velocity

 

[Gretik]

You are assuming...

Look at what that depicts more closely. A fluid movement. It probably means a liquid like water or oil. in that case you are getting into the realms of very complicated hydraulics, in terms of explaining why and working out the pressures and such. probably A Level material, maybe beyond that but idoubt it. I am only doing GCSE's so far, and have not started my A Level courses yet, so I can't tell you more

 

[jynxfactor]

Admitadly I haven't had any formal physics training but I was under the impresion that all partical movment works on the same pricipals and that the differnce between gas and liquid was nearly non-existant. Differing mainly in the density of the substance and it's ability to be compressed.

But either way the principle's should still be the same.

 

[Audguy]

A gas is a type of fluid. It is not a liquid. But fluid. No liquid, but fluid. Fluid flows, liquid flows. Gas flows, water flows. Donkeys walk, gas flows. I flow like a joe when my bow smacks my toe and i go very slow down a hole in my bowl.

 

[Gretik]

I know gasses can flow...

If you up end a glass of CO2 vapours, and if you could see them, you would see a flow rather than a rise because they are lighter than the air around them...

 

[Audguy]

heavier

i believe it would flow because co2 is heavier, right?

 

[Sk8PadTrev]

AudGuy is quite right... Air is a fluid, FLUID not LIQUID fluid is a material that flows, a flow is movement of fluid hence when the fluid (air) is passed through the venturi(bolt or whatever) the velocity increases while the pressure decreases (this is an inverse relationship) this would not facilitate a lower operating pressure as the pressure gradient (high pressure behind the ball and low infront) combined with the velocity and volume is what moves the ball and not just the speed of the gas.

Clear as mud...