Different meanings, scope, training factors, etc.
1. Different Meanings and Scopes: Vortex mainly refers to the spiral water vortex formed by the flow of water when it encounters low-lying places. Vortex is a broader concept that includes the phenomenon of rotation of air, steam, water, wind and other substances. In short, eddies focus more on the rotational phenomena of water masses, while vortices cover a wider range of rotational phenomena.
2. Different formation factors: Vortex formation is mainly due to geostrophic deflection force. For example, in the northern hemisphere, the input velocity direction is to the right, so the input velocity direction points to the right. the right of center, which forms a counterclockwise vortex. Besides the force of devigeostrophic ation, eddy formation can also be affected by other natural factors, such as swirling wind.
When the wind is too strong, there will be a whine. How does moaning occur?
The air rotates quickly around the axis of the tornado. Attracted by the extremely reduced air pressure at the center of the tornado, the airflow is drawn into the bottom of the vortex from all directions in a thin layer of air. tens of meters thick near the ground, and then it turns into an ascending vortex around the axis. The wind in a tornado is always cyclonic, and the air pressure at its center can be 10% lower than the ambient air pressure, usually as low as 400 hPa and as low as 200 hPa. Tornadoes have a great suction effect and can suck sea (lake) water away from the sea (lake) surface to form a water column, which is then connected to clouds, commonlyent called “dragon taking water”.
A tornado is the most powerful vortex in the atmosphere. It often occurs during thunderstorms in summer, especially in the afternoon and evening. Although the impact area is small, it is extremely destructive.
Wherever a tornado passes, phenomena such as uprooting trees, overturning vehicles and destroying buildings often occur. It often destroys crop plots and tens of thousands of fruit trees in an instant, interrupting traffic and collapsing houses. , human and animal lives and economic losses were suffered.
The horizontal range of tornadoes is very small, ranging from a few meters to hundreds of meters in diameter, with an average of about 250 meters and a maximum of about 1 kilometer. The diameter in air can reach several kilometers, with a maximum diameter of 10 kilometers. Maximum wind speed can reachreach 150 to 450 kilometers per hour. The duration of a tornado is usually only a few minutes, but the longest is only tens of minutes.
The moaning sound is mainly caused by friction between wind and other substances. In fact, when the wind moves, the sound is inaudible. The sound heard when the wind comes is the sound of the wind hitting other things. The sound of friction between wind and material is not the sound of wind, but. the sound of material being rubbed by the wind. When the wind hits metal, copper or iron, the sounds it produces are different. It is the friction of copper and iron that produces the sound. When it hits the water, it also makes different sounds. Therefore, do not think that sound is wind. The wind is silent, colorless, invisible and invisible.
If it is inside, the windows of the house must have an opening, or they must not be closed tightlyically, which will produce wind swirls and noises. Just like the sound principle of playing the flute, the room is equivalent to the flute, and the space that is not tightly closed is equivalent to the hole of the flute. The sound is much louder than that caused by a simple friction, so I think it is mainly caused by the vortex phenomenon.
Many users living in high-rise buildings may feel this deeply. Currently, the most common window opening methods in high-rise buildings are sliding windows and fenestration windows. Flat windows are much better airtight and waterproof than sliding windows, and the sound insulation effect is much better. Of course, choose to open the window. Sliding windows: windows open left and right along the track, usually more than two sliding windows should be used; flat windows: generally divided into two ways: interior flat windows and exterior flat windows, and can also be divided into single-sided windows. and double sided.
Generally speaking, it is prohibited to install outward-opening windows in high-rise buildings because outward-opening windows cause many problems. If the wind is strong, windows in high-rise buildings can easily be blown away. No matter how good they are, they will inevitably be misused or neglected. This not only brings inconvenience to the lives of residents. raise families, but also directly threatens the lives of high-rise families and the lives of the masses.
Therefore, in high-rise buildings, safety should be considered first when opening windows. The biggest hidden danger is the safety factor. The WindowsExteriors are directly exposed to sunlight and rain outdoors and are subject to fading, corrosion. and damages; floating windows Hanging it outside the wall makes it difficult to clean the windows and replace the glass. It can also easily make you dizzy and lead to danger.