Why does a whistle sound when you turn on the kettle? You have an electric kettle! Why does a whistle or whistle not whistle

I came home once at 23:00. There were no parents, they went to the country. And I, as usual, immediately sat down at the computer. So, I sit quietly and hear the whistle. I was very surprised, because it was from a boiling kettle. I felt terrible, goosebumps went on my skin, because I have an electric one. I got up from the computer and went to the kitchen to figure out what was wrong. With every step the whistle got louder and louder.

Once in the kitchen, I was horrified. One gas burner was on, but the gas stove was completely empty. After looking a little, I noticed that the shadow of the kettle falls from the light, from which steam flows, the shadow of which was clearly visible. I ran my hand over the place, but nothing, no sensation, but the whistle was still standing and the shadow of the kettle was visible, releasing steam. Just as I was about to turn off the burner, the handle turned on its own and the fire went out, then there was a metallic sound, as if someone had removed the kettle from the gas stove. I became so scared that I flew out of the kitchen like a bullet and after a few seconds I was sitting in my room on the bed, looking at the front door, not taking my eyes off!

So I sat in complete silence for probably ten minutes, until the tap in the kitchen turned on and the sound of rattling dishes was heard, as if someone was washing them. I had a hockey stick in my closet. I picked it up and quietly made my way to the kitchen. The situation was the same as with the gas stove: the water tap was open, and splashes flew in all directions, and the sink itself was empty. What made the sounds of rattling dishes, I do not understand. - “And why did I come out here at all, would it be better to sit in my room?” I began to think.

After about three minutes, the sound of rattling dishes subsided and the water stopped flowing from the tap, and I felt the cold pass through my body, after which I heard the door to my room slam. I was wildly scared, but I nevertheless crept on tiptoe to my room, leaned my ear against the door and began to listen. Someone was inside. There were the sounds of keys, the clicking of a mouse and the squelching, reminiscent of a person drinking hot tea. Then there was the sound of a mug being placed on the table.

Unable to bear all this, I shouted, - Who is here?! - after my loud question, everything calmed down, it became cool in the corridor, and from under the crack of the front door to the room it began to blow cold, as if there, behind the door, was an autumn November day.

After a minute of standing, there was a click: someone closed in my room. It was from this creature that it blew cold. - Who's here?! came from the other side. This phrase shocked me, because it was said in a voice similar to mine, as if I had said it. In the meantime, it was already wildly cold in the corridor, and my head began to spin. That's all I remember. I woke up in the morning in my bed in my room with a hockey stick in my hands. Remembering last night, I immediately rushed to the computer. What I saw, or rather read, surprised me very much. There was a message on social networks from me, addressed to a friend Kolya, and here is its content:

"Hi Kolya! I came home at 23:00. Strange things are happening in my apartment. Decided to sit at the computer before going to bed. It's just so boring to sit, so I put the kettle on to have some tea. While the water was heating, I went to the shower. When he washed himself, he began to dry himself, and at that time the kettle was already whistling. I got out of the bathroom and went to the kitchen. And then I was terrified by the fact that I saw a human shadow lying in front of the gas stove, whose hand looms. Looking a little at this spectacle, I saw that the steam was wavering, as if someone were passing a hand over it. Looking closer, I saw my reflection in front of this teapot. I became uncomfortable.

The first thing that came to my mind was to abruptly turn off the gas burner and remove the kettle. That's exactly what I did. The shadow is gone. I went into a stupor, trying to comprehend what was happening, from which I was brought out by the noise of the slamming door of my room. I thought it was a draft. Today, after all, we drank a little with you, it might seem. Yes? I had dirty dishes in the sink since morning, I started washing them, and as soon as I finished, I turned off the water, after which steps were heard behind me. Frightened, I turned around and saw that my hockey stick was leaning against the kitchen table, and the room suddenly became very cold.

It was then that I jumped into my room, taking a stick with me as an object of self-defense. That's not all. How did a mug of tea I didn't make end up in my room? I do not understand! And now I heard a cry, behind the door: “Who is there?” - I'll go, I'll close, but you never know.

Hey! I'm here, what are you talking about? I went to the door and asked out of fear: “Who is there?” - and in response, silence!

It was noted that Kolya read this message, but for some reason did not answer. But what a mystery - even if I wrote it, then where did I get a metal teapot from? I have an electric one!

And at lunchtime, Nikolai's parents called me and said that he hanged himself. And in his pocket he had a note: “This cannot be, you have an electric kettle!”

Researchers have finally figured out why the kettle whistles. This problem has puzzled scientists for more than a hundred years! The only pity is that you will not find whistling kettles in modern kitchens during the day with fire. The discovery, however, is not so useless and promises to overcome other unpleasant noises.

The findings of two researchers from the University of Cambridge (Cambridge University) will help engineers stop unwanted annoying whistle of a similar nature, which occurs, for example, in home plumbing or when a car exhaust pipe is damaged.

"The effect we've discovered can be applied to a wide range of situations, anywhere where the structure that holds back air flow is like a kettle whistling," said Ross Henrywood of the Faculty of Engineering. "Pipes inside a building are a classic example of this effect. inside a damaged car exhaust system. If you know where the whistle is coming from, you can get rid of it."

Henrywood, who was doing research for his own thesis project, and his supervisor, Dr. Anurag Agarwal, were able to show exactly how the sound inside the kettle occurs when the steam reaches the spout.

Perhaps most people never considered this a serious reason for scientific debate, only this problem goes far beyond ordinary teapots. Using the knowledge gained during the study, scientists can isolate and stop the annoying noises that accompany our everyday life everywhere.

As a rule, a teapot whistle consists of two plates placed close to each other and forming a cavity. Both plates have a hole in the middle that allows steam to escape. It is clear that the whistle of the kettle is the vibrations produced by the increasing volume of steam coming out of the spout. But scientists for many decades could not understand what exactly makes the sound.

Henrywood and Agarwal created several simplified whistles and then conducted a series of experiments in which air passed through them at various speeds (the resulting sound effects were recorded). This allowed scientists to plot the dependence of the frequencies and amplitudes of sound on the parameters of the spout. Finally, they used two microphones to determine the frequency of sound vibrations inside the spout.

The results showed that if the flow velocity is high, the sound appears due to two small vortices (sections of swirling steam flow), which, at certain frequencies, produce noise. As the steam rises towards the spout of the kettle, it hits the first hole, which is much narrower than the spout itself. The steam flow is compressed and a jet of steam is created passing through the hole.

Of course, the jet of steam is unstable (like, say, a jet of water from a garden hose). By the time it reaches the end of the whistle, it is no longer a uniform stream. These instabilities cause a small pressure pulse when hitting the second hole. This impulse causes the formation of eddies of water vapor at the outlet. These whirlwinds produce sound waves, creating a noise signaling that the water for future tea has boiled.

Henrywood and Agarwal also explained why this effect results in whistling and not some other kind of noise. In their opinion, this mechanism is similar to that observed in the pipes of an organ or a flute. Among the sound waves, a certain frequency dominates, which is determined by the size and shape of the hole, as well as the length of the spout. The longer the nose, the lower the tone will be.

The researchers also found that the kettle would whistle even if the flow rate was lower than needed for the eddies to form. They also discovered another sound-producing mechanism that works when water boils. The difference is that the tone of the sound at this stage has the same frequency, despite the wide range of speeds. It turned out that at a speed below the critical sound source are vibrations stuck between the two plates of air. This is similar to the action of a Helmholtz resonator - the same mechanism produces sound if you blow into an empty bottle.

When air enters the open neck of the bottle, the air inside the neck seems to bounce up and down like a spring. A similar mechanism is observed when boiling some kettles.

According to the scientists, the study helped them evaluate the various mechanisms at work. A worthy opening will allow you to make changes to the design and prevent the occurrence of noise. At the moment, Henrywood and Agarwal are developing a project based on their research.

Surely, everyone will appreciate the functionality of the whistle for the kettle, which lets us know about the readiness of water for preparing hot drinks and does not allow the vessel to boil in vain. However, it happens that these useful gizmos are lost, broken or simply missing when buying a kettle. In this case, you need to know how to make a whistle for a kettle with your own hands. Craftsmen come up with various ways to make useful accessories for homemade teapots from improvised materials with a minimum set of tools, so let's look at the most interesting options together.

metal whistle

In shape, this device often resembles a short cylinder. Although, its upper part can have absolutely any design. The main thing here is that the device system and its functionality are not lost. However, if you want to make a whistle on the kettle with your own hands, it is still better to stop at the cylinder.

It will not be difficult for craftsmen who have worked with metal at least once to make a fixture out of copper or zinc plates. Having a metal that is not subject to corrosion, you can make such a simple device:

To do this, cut out several parts to fit the spout - two circles and a rectangle for the cylinder.
After that, solder them together, getting a great accessory in the shape of a hat.

cork whistle

You can make a whistle for a kettle with your own hands, original, but, at the same time, quite functional, from ordinary corks, which mainly close bottles of lemonade and beer:

With the help of a soldering tool, two such plugs are connected together.
After that, holes of 3 mm are cut into them.

Important! To make a more voluminous whistle for a kettle, a cylinder soldered from durable and lightweight metal, which is placed between the plugs, can help.

whistle

For ordinary teapots with thin spouts, a baby whistle is quite suitable, which, as a rule, is able to fully adhere to the surface. If, on the contrary, the teapot has a wide pouring part, then a metal cup can become a wonderful base, in which, using a thin nozzle of an electric drill, you can very easily make a hole.

Important! To make a whistle for a teapot with your own hands, which will serve you well and safely for a long time, you need to be smart about choosing a metal for it.

A whistling thing cannot be made of aluminum or plastic. Preference should be given to materials that are resistant to corrosion, such as copper, zinc or galvanized.

whistle repair

The need to make a whistling device for the kettle is very often caused by the breakdown of the old device. In this case, one of the best options is to simply repair the failed part.

Important! Often, the breakdown consists in falling off the whistle of the plate inside, which is not always welded to the conscience.

If you have just such a situation, then you can fix the accessory using the following steps:

Pull the whistle out of the shell - for this you will need a regular screwdriver to help pry the edge of the part.
Holding the whistle in your hand, remove the spring under it, prepare the surface. To do this, sand the four mating surfaces.
During the soldering process, you will need soldering acid, which will later be needed for neutralization.
After careful preparation, you can proceed directly to soldering, and then you need to carefully clean the parts.
At the end of the last step, neutralize with alkali.

Important! For this purpose, you can also use ordinary ammonia, however, remember that this procedure must be carried out outdoors.

To neutralize the corrected whistle, put it in a shallow glass beaker and fill it with 10 or 25% ammonia.

footage

As you can see, making a whistle on the kettle with your own hands is not so difficult. If it is made correctly and from good material, it will most likely outlive the teapot itself. The presence of metal, a soldering iron and minimal experience can completely solve the problem with a broken whistle or its absence.

Sometimes you want to find answers to completely unexpected questions. So, in the morning, performing a daily ritual - boiling water in a kettle, I suddenly thought - why does the kettle whistle?

Let's try to find out why the kettle whistles. To do this, take a standard kettle with a volume of 3 liters. Fill it with water at room temperature to an acceptable level. If the room temperature is 20 degrees Celsius above zero, then the water temperature will be about the same. We light the gas, put the kettle on. What is happening inside him at this time?

From the school course in physics, we know that the boiling point of water is 100 degrees. This means that in order for water to boil, it is necessary to raise the temperature by 80 degrees. Our task is to see how the state of the water changes, and at what stage the long-awaited whistle is heard.

Stage 1: 20-50 degrees - the water just started to heat up, the lid fogs up for a few seconds, nothing special happens.

Stage 2: 50-80 - the water continues to heat up, soft sounds are heard. The liquid begins to "worry", the bottom of the dishes is very hot, due to the high temperature, scale crumbs break off from the bottom and walls of the kettle, as a result, we hear crackling and barely noticeable twitches of the "subject".

Stage 3: 80-100 - serious unrest begins in the kettle, the water boils, boils. The bottom is the hottest part, so the liquid tends to go up, where it is relatively cooler, and thus conditionally moves in a circle. A jet of steam quickly flies out of the spout, a whistle is heard. And on the rise: louder and louder.

Stage 4: turn off the gas, the heating stops and the whistle subsides, no steam comes out. The temperature is dropping.

Let's try to figure out the device of the whistle. As a rule, it is made of metal. This is logical, since the melting point of the metal is much higher than the boiling point of water. Two plates are inserted into the whistle, two holes are symmetrically made in them, a distance of several millimeters between them.

When boiling, water gradually passes from a liquid state to a gaseous state, a large amount of steam accumulates in a small free place inside the kettle, and it becomes more and more, and space is small. The only outlet for steam is the hole in the whistle. Air streams are trapped in two plates and begin to oscillate in this gap. Small eddies form. They interact with the main stream, which in the meantime breaks out. The soundtrack appears. It signals to us that the water for future tea is ready.

While every morning we are swinging, trying to wake up, such amazing things happen next to us :)

Today, bright whistling enamel kettles are gradually being replaced by electric ones. The speed of boiling water in them is faster, and due to the fact that people are constantly in a hurry somewhere, time is the main unit of measurement for them. But, even if kettles with whistles are in the minority, they still exist. Let's try to find out why the kettle whistles. To do this, take a standard kettle with a volume of 3 liters. Let's fill it with water at room temperature..." class="element-invisible no-mobile">

Interesting

Victoria Smirnova

Machines and Mechanisms

And the whistle doesn't care what passes through it: clean air or steam. This is how we know that the kettle has boiled.

When the water in the kettle boils, it turns into a gaseous state, turning into water vapor. At the same time, it expands and it needs much more space. Steam is looking for this place in the kettle, it rushes to the spout. And since our kettle has a whistle, a special device, the so-called valve, is installed on its nose :). The steam passes through the narrow passages of this valve and produces a whistling sound.

We even have such a game: the kettle whistled on the kun, and there was no one nearby, then everyone tries to be the first to say: "They came to you!" Whoever didn’t have time, he goes to turn off the kettle.)

The whistle comes from the whistle. Usually this is a narrow hole in the cork in the spout or in the lid of the kettle. Water boils, expands and turns into steam. He has nowhere to go, he looks for a way out and finds it through the spout if there is little water, or through a whistle in the lid of the kettle. In a narrow passage system, pressurized steam produces a high-pitched, harsh sound.

There is a whistle on the spout of the teapot. When we whistle with a regular whistle, we thereby create air pressure in it, as a result of which, under the influence of air vibration, a whistle is obtained. In the kettle, it is hot steam, which "irritates" the whistle.

Why does the whistle or whistle not whistle?

2. Another problem may be the lack of a whistle of a whistle, the clogging of the air channel leading to the air divider.

3. The third problem may be the inappropriate dimensions of the air channel and the opening of the whistle device.

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Vesti.ru

News Science

Scientists for over 100 years couldn't figure out why teapots whistle

Oddly enough, in all the years of brewing tea, no one could explain exactly why the teapot whistles.

"The effect we've discovered can be applied to a wide range of situations, anywhere where the structure that holds back air flow is like a kettle whistling," says Ross Henrywood of the School of Engineering. "Pipes inside a building are a classic example of this effect. It's also seen inside a damaged car exhaust system. If you know where the whistle is coming from, you can get rid of it."

Henrywood, who was doing research for his own thesis project, and his supervisor, Dr. Anurag Agarwal, were able to show exactly how the sound inside the kettle occurs when the steam reaches the spout.

When air enters the open neck of the bottle, the air inside the neck seems to bounce up and down like a spring. A similar mechanism is observed when boiling some kettles.

According to the scientists, the study helped them evaluate the various mechanisms at work. The discovery, worthy of next year's Ig Nobel Prize, will make it possible to make changes in the design and prevent the occurrence of noise. Henrywood and Agarwal are currently developing a design for a silent high speed hand dryer based on their research.

Details of the study are in a scientific article in The Physics Of Fluids.

Why is the kettle whistling?

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BMW 5 series - Evil › Logbook › Why is the whistle whistling?

And with the window closed too. Speed from 80.

BMW 5 series 2002, petrol engine 3.0 l., 231 l. p., Rear drive, Automatic - car audio

Comments 17

whistle whistle because in it the man the wind makes

I will reveal the secret. The whistle comes from the rear view mirror. There is not much gap there. put your hand on the mirror at the moment when it whistled, and if the sound is gone, then it is 100%. Good luck.

Attached, gone, damn miracle ... But how to remove it and continue to live in silence?

Remove the case and warm it up with a hair dryer. And make sure there is no gap.

Damn and ts me exactly the same whistle and also from 80, I substituted my hand and this way and that does not disappear. How to fix? And only on the left😄

I read the guy had a similar problem after replacing the lobash with 39. But then once you fold the mirror and there is no whistle, then you don’t have to guess))

Lobash is also to be replaced by the summer, the Chinese are all shuffled already, not at all happy

And I have such a problem. Manifested when the face changed the hood fenders bumper and mirror cover. Didn't notice before

Did you change the plastic on the mirrors?

Yes, the previous owner changed.

According to the plan, the revision of all mirrors, with complete disassembly and cleaning; there and see if this whistler leaves

When I fold the mirror, it doesn't whistle.

M mirrors and problem solved

Well, why and the vidon is immediately different ... space

The kettle boiled somewhere.))

I drove 1000 km along the highway under this whistle - my eye began to twitch))

Why is the whistle blowing

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Whistling

Whistling is a characteristic high-pitched sound that occurs when air flows through a narrow opening. The whistle is often used as a signal of danger, a call for help; as a signal to start and stop a sports game; for the expression of emotions by sports fans.

The technical device for whistling is called a whistle. There are special ultrasonic whistles that are inaudible to humans, which are used to give silent commands to the dog.

Without a whistle, a person can whistle by blowing air through pursed lips, or through a hole that appears between the palate and the fingers attached to the tongue. Some animals are also capable of whistling.

With the help of a whistle, you can play melodies - in this case they speak of an artistic whistle. Artistic whistling is taught in some music schools and studios.

Whistlers are the heroes of folk tales (for example, the Nightingale the Robber). They also entered the sayings and proverbs (for example, "whistlers - in the cold").
In Russia and Ukraine, there is a sign that whistling in your house can lead to a lack of money.
Whistling in Islam is considered the "music of the devil".
In Finland, whistling is a sign of friendly greeting in an informal setting.
In Russia, whistling is one of the forms of expressing discontent at public events.

A. Plotnikova. On the symbolism of the whistle // Sounding and silent world: Semiotics of sound and speech in the traditional culture of the Slavs. M., 1999, p. 295-304.

At the same time, in order to comply with the attribution rules, you should install the template > on the discussion page, or indicate a link to the source article in the comment to the edit.

How does a whistling kettle work? Where is the whistle from?

The device of the whistle of the kettle is identical to the device of a conventional whistle, only the excess steam generated in the kettle when water boils will blow into it:

In fact, you can buy an ordinary whistle and stick it to the kettle spout with tape.

Most likely, it whistles from a lid that is put on the spout, here is an approximate diagram of such a lid, it whistles because the air swirls. The pea is no longer used, or rather, very rarely, but the whistle was more fun with the pea.

Whistle, of course, from a whistle. And it occurs when the steam that occurs when the liquid boils passes through the whistle. An excess pressure arises in the cavity of the kettle, which is released through the whistle. And the whistle doesn't care what passes through it: clean air or steam. This is how we know that the kettle has boiled.

The whistle of the kettle itself, which is located on its spout, whistles, when it fits snugly against the spout of the kettle, it prevents the quick release of steam from the kettle, and the steam has to pass through a small gap in the whistle, as a result of which the whistle occurs. The circuit is very simple, and the more pressure in the kettle, the stronger the whistle.

There is a whistle in the nose. When boiling and boiling, steam escapes through the spout and a whistle is obtained (with a strong boil, it is louder). By analogy, as if a person blew a whistle, there would also be a stream of air directed into the whistle.

Any airflow at high speed creates a whistle. This is a natural phenomenon and is used in whistling kettles.

Heated water vapor, passing through the thin channels of the whistle, significantly increases its speed. Moreover, the speed of steam in the whistle becomes so high that this whistle appears.

Any sound is a vibration of air. The human ear is not able to pick up all the vibrations, but it hears the whistle from the kettle perfectly!

You can experiment. Take a thin vine or fishing line with a weight. Unwind the fishing line in front of you, and just wave the vine like a saber. In both cases, you will hear a whistle, which is a consequence of the appearance of sound waves.

The same goes for the whistle in the teapot. In the picture of the whistle that is provided here, you can see that there are channels in the whistle that narrow in one place. According to Bernoulli's law, in this bottleneck, a high steam velocity occurs. And if there is speed, then there will be sound.

More details about this are written in the physics textbook for the 6th grade. I don't remember everything.

The whistle occurs when steam from the kettle passes through a narrowed hole in the whistle.

In this case, excess pressure arises and the body of the whistle itself resonates. The whistle device can be seen in the picture:

If you take the whistle apart and then stick a plastic ball about the size of a pea into it, then the whistle will turn out to be more hooligan or look like a police whistle.

We even have such a game: the kettle whistled on the kun, and there was no one nearby, then everyone tries to be the first to say: They came to you! Who did not have time, he goes to turn off the kettle.)

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