Summary:Regarding the lighter, oil is combustible and air is the combustion-supporting material. We only nee...
Regarding the lighter, oil is combustible and air is the combustion-supporting material. We only need to keep the temperature above the ignition point to keep it burning. The wind can take away the heat of the flame. The larger the wind, the faster the heat is taken away. Then we only need to plan a windshield device to reduce the speed of the air flowing through the flame below a certain level, and the flame can be Continue to burn. This is how the windbreak happened. Next, let's take a look at the effect of the windbreak on the airflow through the flame.
The wind blows horizontally towards the windbreak wall. Most parts of the windbreak wall are non-porous. The wind is blocked to move on both sides and above. Where there are holes, a much smaller amount of air passes through the small holes because the iron sheets around the small holes block it. The area is a low pressure area, and the air column passing through the small holes is dispersed, forming multiple vortices inside the incineration chamber. Because these vortices have different directions from each other, they weaken and cancel each other, and the entire incineration chamber constitutes many turbulent flows with lower flow rates. These low-velocity turbulences are not enough for the wick flame to quickly take away the heat. Therefore, the wick flame can continue to be maintained above the ignition point of the Z oil, and the incineration can be maintained.
When the wind speed outside the windbreak wall increases, the velocity of the air column passing through the small holes also increases, and the velocity of the multiple turbulent turbulences formed in the incineration chamber will also increase. When the turbulent flow velocity inside the incineration chamber is so large that it takes away more heat than the flame can generate, the incineration process is stopped and the flame subsides. I heard that Zippo company held a scientific Zippo wind resistance test in 1979. The test used a 200-type Zippo as the test object, and the results showed that its wind resistance was 32 miles per hour.
By the way, some people say that ZIPPO is windproof, so why do you blow it out with your mouth? We can make a budget for the wind speed of the mouth blowing. The normal vital capacity of an adult male is about 3,500 milliliters. When we breathe, the mouth formed by the lips is about 0.5 square centimeters. Then when 3,500 milliliters (cubic centimeters) of gas passes through a small hole of 0.5 square centimeters, it will form a gas column with a length of 7000 cm, which is 70 meters. Generally, it will be blown out in about 3 seconds in one breath. The wind speed of is about 23.33 meters, which is equivalent to 9 strong winds in the Pu's wind scale. Converted to 84 km/h. A speed of 32 miles per hour is equivalent to 51.2 km/h. Now you may know that even if you breathe slowly, the wind speed may be much higher than the level 5 strong wind outside.
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