What is the principle behind air circulation in narrow alleys? !
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Life experience tells us that on windy days, walking in the narrow alleys between tall buildings, one feels a stronger wind than outside. But if we analyze it, the wind pressure on both sides of the alley is essentially the same; it’s not suction caused by negative pressure. When wind passes through narrow alleys, the passage narrows, the flow velocity increases, and the dynamic pressure rises; therefore, we think it is the alleyways that are drawing in the wind. What do you all think? !
The principle is actually quite simple: just as fluid flows through pipes, where there are valves or throttling elements, the flow velocity increases, the static pressure decreases, the dynamic head increases, resulting in an overall loss of mechanical energy.
Applying what one has learned – the original poster has set a great example
The flow cross-sectional area decreases, and the flow velocity increases
It is Bernoulli’s principle in fluid mechanics.