ignition by collison
ignition by collison
(OP)
Is it possible for a flammable substance (methane, butane, propane, etc.) to ignite due to a high velocity collision with O2?
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RE: ignition by collison
This is why we purge the air out of gas lines.
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: ignition by collison
So I'm assuming this type of thing happens when high velocity gas is piped into a tank initially filled with air.
Would the same type of thing occur if you were to have a flow of gas and a flow of air directed at each other at high velocity. My guess is yes based on what you stated in the previous post.
Thank you David. I try to learn something new every day. Box definitely checked!
RE: ignition by collison
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist
RE: ignition by collison
Two high-velocity streams will not mix. I can point a 1.0 Mach methane stream at a 1.0 Mach air stream with an ignition source at the point of contact and the resulting fire will be underwhelming (only the gases slowed by the no-flow boundary will participate). You also will not get any measurable heat of compression. Once everything has slowed to the velocities we consider "incompressible" (depending on the researcher, below somewhere between 0.3 and 0.6 Mach), you will begin to see mixing. I once saw a flow visualization experiment where a high velocity red stream was shot at a high velocity blue stream inside of a clear plastic pipe (no idea how they colored the gases, maybe smoke?) Purple gas started appearing about 20 pipe diameters either side of impact point (between the two purple points, there were streams of red and streams of blue indicated a reluctance to mixing). The purple gas could very well have been between the LEL and UEL of a flammable gas, but the temperature of the purple gas was the same as the red and blue gases so you don't have an obvious ignition source.
David Simpson, PE
MuleShoe Engineering
In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist