A system that generates electricity with a ``water drinking bird'' that continues to move forever as long as there is water has appeared, and it can operate for 50 hours with just 100 ml of water and can generate a voltage of up to 100 volts
by Frank Vincentz
A ``
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A drinking bird is an ornament made of two glass bulbs connected by a tube. The inside of the glass bulb contains colored dichloromethane liquid, and since the air is removed, the cavity is filled with vaporized dichloromethane.The glass tube has a rotating shaft and two legs. It is being
You can understand how the drinking bird moves when you leave a cup filled with water by watching the movie below.
[HD 60FPS] 2 Dippy Drinking Birds - 1 HOUR - YouTube
The principle behind how water birds move their heads semi-permanently is like this.
1: The drinking bird stands vertically because its body (lower glass bulb), which is filled with liquefied dichloromethane, is heavier than its head (upper glass bulb).
2: When you wet the cloth beak attached to its head with water, the water evaporates and takes away the heat of vaporization.
3: As the temperature of the head decreases, the dichloromethane vapor inside the head condenses.
4: The air pressure inside the head decreases, and the dichloromethane liquid that has accumulated in the torso is sucked up.
5: The dichloromethane liquid is sucked up to the head, making the head heavy and causing the drinking bird to lean forward.
6: When a drinking bird leans forward, its beak touches the surface of the glass.
7: When the tip of the glass tube inside the body emerges from the liquid level inside the body, the dichloromethane gas that has accumulated in the body flows into the head.
8: At the same time, the dichloromethane liquid that was sucked up into the head flows back into the torso, making the torso heavier.
9: The drinking bird returns to vertical. After that, return to 1 and repeat.
Professor Hao Wu of the South China University of Technology wondered if water evaporation could be converted into electricity through drinking birds, and devised a power generation system called DB-THG that uses frictional charging .
You can understand what kind of system DB-THG is by watching the movie below.
DB-THG powering 20 LCDs (Credit: Device, Wu Zheng Qin et al) - YouTube
Two disks are attached to sandwich a commercially available drinking bird, and these disks are equipped with a material that causes frictional electrification. There are 20 LCD panels on the left side of the screen.
A drinking bird drinks water.
When the dichloromethane liquid flowed into the torso and the head lifted, the charge shifted and the liquid crystal panel was all visible.
According to the research team, in an experiment conducted at a room temperature of 24 degrees Celsius and a relative humidity of 20% ± 5%, DB-THG was able to operate for 50 hours with just 100 ml of water, and the maximum voltage was recorded at 100 V. The research team also reported that they were able to successfully operate small electronic devices such as thermometers and calculators in addition to liquid crystal panels using DB-THG.
The research team's future challenge is to design a new type of drinking bird that can more efficiently convert water evaporation into electrical energy, rather than commercially available drinking birds.
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