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伯努利定律
空氣中的壓力與流速
2
伯努利定律

伯努利定律是流體力學中一項,所講的就是當流速不
。同的時候,壓力就會不同 壓力大會往壓力小的地方
。擠壓

那麼為什麼流速快壓力會變小呢?

。因為流體與物體碰撞會產生壓力 流速如果較快,碰
。撞機會就會少,壓力就變小了 流速慢,碰撞機會大
。,壓力就變大了
3
與伯努利相關的科學
4
文氏效應
5
用能量守恆來解釋伯努利定律

白努利原理其實就是能量守恆定律( conservation
of energy 。)在流體上的應用

。也就是說我們能使用文氏管來算出壓力與流速

。因為它們的壓力流速的總數是會等於的
6
棒球與氣壓
7
竹蜻蜓
8
特例:托里切利定律
9
伯努利如何解決問題?

。飛機也就是利用白努力定律起飛的

一般來說機翼的形狀是上面凸底下凹,飛行的時候從
。上下兩面流過的氣流速度會有差異 慢根據白努力定
律,從下面流過的速度慢,所以壓強大,相反地,從
上面流過的速度較快,所以壓強亦較小,壓強大的一
。方要向壓強小的一方產生推力,這就是機翼的昇力
10
參考資料

https://youtu.be/zP7Eu4FDE8I

https://www.grc.nasa.gov/www/k-12/airplane/bern.h

https://youtu.be/Qz1g6kqvUG8

https://www.youtube.com/watch?v=8vqMotb6m3c

https://smallcollation.blogspot.tw/2013/11/bernoulli
謝謝大家

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伯努利定律