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- Thread starter onebadvet
- Start date
You guys......It's all a lot of hot air.........
Look up forced convection vs natural convection, two of the topics covered in Heat Transfer courses in engineering school. The rate of heat transfer is indeed higher for forced convection. Whether or not it is significant enough to matter at the gun range..... As others have noted, there has to be a temperature differential between the fluid (air) and the object being cooled.
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I'm not an engineer, but I presume this is the premise of effective air cooling of fighter aircraft guns at high altitudes where the ambient air temperature is below zero. If so, thank you for explaining it so succinctly.
I'm gonna call it a day right here . . .
Protocall_Design
Vendor
I didn't realize that Chevy made tractors.
They don't - it must have been a Ford.
venomballistics
Member
then why are fans a staple of computer cooling systems or engines for that matter.
Rastoff
US Veteran
The barrel is hotter than the air. Using a fan pushes the air next to the barrel away and replaces it with cooler air. It doesn't work as well as liquid cooling, but it does work.
This is a better solution:
The heat sink increases the surface area. More surface area allows the heat to dissipate quicker. Adding a fan to this would cool it even faster.
Even so, it's not necessary and won't dramatically improve/change your groups unless you're in a bench rest competition.
Heat transer....boundary layer
An object cools by several means. Radiation, conduction and convection of heat. The air around a hot object heats quickly, but the boundary layer of air prevents efficient cooling by convection because the difference in temperature isn't as great from the hot object to the stagnant boundary layer. Forced air replaces the hot boundary layer with cooler ambient air, and the higher difference in temperature allows faster heat transfer, cooling the object faster than if it just sat in ambient air.
The shop is a completely different problem. The shop feels cooler because the evaporation of sweat along with the interruption of the boundary layer around your skin causes the shop to FEEL cooler even though the temperature is the same. If a fan can replace hot inside air with cooler air, it will drop the temperature. Blowing hot air around inside a hot shop only cools people by evaporative effect.
A gun barrel interior has very little circulation. Blowing outside air, even hot outside air into a barrel will cool it quickly as long as the outside air is cooler than the barrel. To split hairs further, if you open the cylinder or bolt and place the gun with the barrel at an angle, the 'chimney effect' will circulate air and cool the barrel faster.
An object cools by several means. Radiation, conduction and convection of heat. The air around a hot object heats quickly, but the boundary layer of air prevents efficient cooling by convection because the difference in temperature isn't as great from the hot object to the stagnant boundary layer. Forced air replaces the hot boundary layer with cooler ambient air, and the higher difference in temperature allows faster heat transfer, cooling the object faster than if it just sat in ambient air.
The shop is a completely different problem. The shop feels cooler because the evaporation of sweat along with the interruption of the boundary layer around your skin causes the shop to FEEL cooler even though the temperature is the same. If a fan can replace hot inside air with cooler air, it will drop the temperature. Blowing hot air around inside a hot shop only cools people by evaporative effect.
A gun barrel interior has very little circulation. Blowing outside air, even hot outside air into a barrel will cool it quickly as long as the outside air is cooler than the barrel. To split hairs further, if you open the cylinder or bolt and place the gun with the barrel at an angle, the 'chimney effect' will circulate air and cool the barrel faster.
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Ribwizzard
Member
Dude. If you want to test how a fan cools something , heat up two hot pockets, put one in front of the fan and leave one in the microwave ( turned off ) . That's how they teach it on Seseme Street.
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