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  • Hey it's me Destin welcome to Smarter Every Day

    嘿,這是我Destin歡迎來到Smarter Every Day。

  • and today we're going to show you some pretty cool

    和今天我們'要告訴你一些很酷的

  • high speed, and it has nothing to do with all those assault rifles.

    高速,這與那些突擊步槍無關。

  • It's actually much sweeter than that, literally.

    它'其實比這更甜,從字面上看。

  • Check this out. It is a

    看看這個。這是一個

  • jar of honey.

    罐子裡的蜂蜜。

  • So, I know this sounds a little strange

    所以,我知道這聽起來有點奇怪

  • but we've got a high speed camera setup, and we are going to show you

    但我們已經得到了一個高速攝影機的設置, 我們將向您展示

  • something called the liquid rope coil effect. This is how it works.

    叫做液體繩圈效應的東西。這就是它的工作原理。

  • You just put some of the honey on this chopstick here,

    你就在這根筷子上放點蜂蜜吧。

  • and just drip it down. And look at this.

    並只是滴下來。看看這個。

  • Check out that. How cool is that.

    看看這個。多麼酷的是。

  • It has to do with the viscosity of the fluid, and basically the liquid is piling

    這和液體的粘度有關,基本上液體都是堆積的。

  • up. So I think this is really really neat, so we're gonna get a little bit of

    了。所以我覺得這真的很整潔,所以我們'會得到一點點的

  • high speed of it, and then after that we're going to discuss

    的高速,然後在這之後我們'要討論。

  • this in more detail. Fluid dynamics are awesome.

    這個比較詳細。流體動力學很厲害。

  • It's tempting to think that this would be an easy math problem but it turns out people have been studying

    它'的誘惑,認為這將是一個簡單的數學問題,但事實證明,人們一直在研究'。

  • this for fifty years. To explain, let me show you the variables.

    這五十年來。解釋一下,讓我給你看看變量。

  • This section is call the coil, and this section is called the tail.

    這一段叫線圈,這一段叫尾巴。

  • The coil and the tail together make up the total height, H. The mass flow rate of the material

    卷材和尾部共同構成總高度H。

  • is Q, and the initial radius at the top of the tail is called

    為Q,尾部頂部的初始半徑稱為

  • "a sub zero". We'll call the radius at the bottom "a sub one".

    "一個子零"。我們'將底部的半徑稱為"一個子一"。

  • And the exciting part is the angular coiling frequency, which is omega.

    而令人興奮的是角卷頻率,也就是歐米伽。

  • The fluid itself also has internal properties that we have to consider. Density is rho

    流體本身也有我們要考慮的內部特性。密度為rho

  • and the surface tension coefficient is gamma. The kinematic viscosity is nu.

    而表面張力係數為gamma。運動粘度為μ。

  • OK simply put, viscosity is

    好吧,簡單來說,粘度就是

  • the measure of the thickness of a fluid. Viscosity is the measure of a fluid to

    粘度是衡量流體厚度的標準。 粘度是衡量流體對

  • resist a sheer or tensile stress. Dynamic viscosity is measured in

    抵抗剪切或拉伸應力。動態粘度的測量組織、部門是

  • Poise, whereas kinematic viscosity is measured in Stokes.

    坡度,而運動粘度則以斯托克斯為組織、部門。

  • Kinematic viscosity is also referred to as the Diffusivity of Momentum.

    運動粘度又稱動量擴散性。

  • And that makes sense if you think about it, to diffuse momentum throughout a fluid.

    而如果你仔細想想,在流體中擴散動量也是有道理的。

  • As you can see here, obviously the molasses honey mixture is the most viscous.

    從這裡可以看出,顯然糖蜜的混合物是最粘稠的。

  • OK if these big words are boring you, just wait. There's a shower scene for you.

    好吧,如果這些大詞讓你覺得無聊,就等著吧。有'的洗澡場景給你。

  • But if you're like me and you want to understand what's going on and you want to know the math, let's do this.

    但如果你'像我一樣,你想了解什麼'是怎麼回事,你想知道的數學,讓我們'這樣做。

  • What you're looking at here are the four different types of flow that scientists can describe

    你在這裡看到的是科學家們可以描述的四種不同類型的流動。

  • using the variables that we defined earlier. Let's start here with this one.

    依照我們前面定義的變量。讓我們從這個開始吧。

  • This is the viscous flow regime. The way it works is as H, or the height that the

    這就是粘性流動體制。它的工作方式是H,或稱為高度,即

  • fluid is dropped from is relatively small, the flow has to

    流體的落差相對較小,流量必須要大。

  • naturally go into a spiral because the fluid has to get out of the way of itself.

    自然而然地進入了螺旋狀態,因為流體要離開自己。

  • Now the interesting thing about the equation used to define the coiling frequency is

    現在,關於定義卷繞頻率的方程的有趣之處在於

  • that it doesn't even include the kinematic viscosity of the fluid. That's interesting

    它甚至不包括流體的運動粘度。這很有趣

  • seeing how it's called the viscous flow regime. OK the second condition we're talking about

    看到它是如何被稱為粘性流動制度。好了,第二個條件,我們說的是

  • here is called the gravitational flow regime. Basically the way it works is

    這裡叫做引力流體制。基本上它的工作方式是

  • as that height increases, gravity begins to take over and stretch

    隨著高度的增加,重力開始接管和伸展

  • the fluid. So basically the viscosity of the fluid is resisting that

    的流體。所以,基本上流體的粘度是抵制了這一點。

  • stretching, and that's why the equation there shows that kinematic viscosity starts to

    拉伸,這就是為什麼那裡的方程顯示運動粘度開始下降的原因。

  • come into play. And that's where the coiling becomes uniform and stable.

    來發揮作用。而這也是卷繞變得均勻穩定的地方。

  • That's the exact condition that we were filming with the high speed camera earlier.

    這正是我們之前用高速攝影機拍攝的狀況。

  • The third condition we're gonna talk about is called the intertial regime. Now as height

    第三個條件,我們'要談的是所謂的際制度。現在作為高度

  • gets very very long what happens is that fluid becomes very fast

    變得非常長 會發生的事情是,流體變得非常快。

  • and very very skinny. Now you noticed in the equation that the radius of

    而且非常非常瘦。現在你注意到在方程中,半徑為

  • the coil at the bottom is factored into the denominiator and raised to the tenth power.

    底部的線圈被計入面額,並提高到十次方。

  • Now if you think about it, that means the smaller the radius gets

    如果你仔細想一想,那就意味著半徑越小

  • the higher the coiling frequency, which makes sense. OK the fourth regime

    卷繞頻率越高,這是有道理的。好了,第四種制度

  • is why I love science. All we know is that somewhere between the gravitational

    是我熱愛科學的原因。我們所知道的是,在引力之間的某處

  • regime and the intertial regime, everything goes out the window. All of a sudden

    體制和國際體制,一切都不復存在。突然間

  • you'll go from a steady state coil to some erattic figure eight pattern or something stranger

    你會從一個穩定的狀態線圈到一些 erattic數字8模式或一些更奇怪的東西。

  • but if you raise it just a little bit more, all of a sudden you're steady state again.

    但如果你再提高一點點,突然間你'又變成了穩態。

  • Even more, and you're back on stable. Everything is erratic. The frequency

    甚至更多,你'又回到了穩定上。一切都是不穩定的。頻率

  • is varying wildly, but it seems to have some sort of pattern but we don't know why.

    是變化很大,但它似乎有某種模式,但我們不知道為什麼。

  • It's very interesting and there has been a very complex study done on it and I'll leave the link in the

    很有趣,而且關於這個有一個非常複雜的研究,我會把連結放在

  • description too that so you can check it out yourself. I think it's amazing that we as humans can

    影片描述欄,所以你可以自己看看。我認為這是驚人的,我們作為人類可以

  • conquer so many things about the world around us but we still struggle with the smallest of things.

    征服了周圍世界那麼多的東西,但我們還是在小事上掙扎。

  • If you're interested in knowing why I did this video I'll leave that info in the description as well.

    如果你'有興趣知道我為什麼要做這個視頻,我'會把這個資訊也留在描述中。

  • Boy that got weird in a hurry didn't it. Every single day

    天啊,一下子就變得很奇怪了,不是嗎'。每一天

  • you can check out the liquid rope coil effect in your own shower. It's pretty easy. Just take your

    你可以在自己的淋浴房裡檢查出液體繩圈效果。它'很容易。只要把你的

  • shampoo, which is a pretty viscous fluid, and throttle the flow rate

    洗髮水,這是一個相當粘稠的液體,和節流的速度。

  • and the height until you get the right combination and then boom.

    和高度,直到你得到正確的組合,然後轟。

  • You lock in on the liquid rope coil effect. It's pretty cool.

    你鎖定液繩線圈效果。很酷

  • You can change things and see how the variables effect it's action. Anyway,

    你可以改變東西,看看變量如何影響它'的行動。總之。

  • I'm not responsible for any extra shampoo you end up using.

    我'我不負責任何額外的洗髮水,你最終使用。

  • I'm Destin. You're getting Smarter Every Day. Have a good one.

    我是Destin你每天都在變得更聰明。 有一個好的。

  • [ Captions by Andrew Jackson ]

    [安德魯-傑克遜的字幕]

Hey it's me Destin welcome to Smarter Every Day

嘿,這是我Destin歡迎來到Smarter Every Day。

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【每天更聰明】慢動作看繩捲現象 Amazing Honey Coiling High Speed Video! - Smarter Every Day 53

  • 79 5
    Furong Lai 發佈於 2012 年 12 月 16 日
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