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ウルトラファインバブル生成器の革新的技術

In テクノロジー by Erik van Berkum : 火曜日, 23 5月 2017

When making a bubble you put a gas into the liquid, a bubble is family of a droplet which is a liquid in a gas. Another member of the bubble and droplet family is a particle which is a solid in a gas or in liquid. It's important to distinguish these three terms from each other. There are a few methods to make bubbles, hydrodynamically, acoustic, optic and via particle cavitation. The most cost-effective method and most efficient method to make ultrafine bubbles is hydrodynamically. Hydrodynamics is a branch of physics that deals with motion on fluids and the forces acting on solid bodies immersed in fluids and in motion relative to them. To say it simple to create a bubble you need a moving liquid, add a gas and bring a force on the gas and liquid and the bubbles are created. In everyday life when you open a can of beer or a bottle of coke, by the change in pressure (the force) the bubbles are created, this is visible by the eye and by the sound.

1982 was the first time to publish an article about nano bubbles and until recently the existence of nano bubbles was heavily debated, the recent hype in ultrafine bubble technology or nano bubble technology is caused by two factors, first, there is now equipment on the market available that can measure ultrafine bubbles size and density and now most of the scientists agree that nano bubbles exist. Second the big advantage of the measuring equipment was that ultrafine bubble makers are now able to further develop and optimize their ultrafine bubble generators and they further develop applications.

Basically, there are two types of nano bubble generation technologies, first there are gas-water circulation types of nano bubble generators. Second there is a gas-water pressurization-decompression also often referred to as pressurized dissolution type of nano bubble generator. Most units are based on one principle or the other or a combination of both.

We can distinguish the following production methods of fine bubbles; the first 4 methods are described in more detail:

  1. Pressurized dissolution 
  2. Rotational Flow
  3. Turbulent Static mixer
  4. Ejector Nozzle
  5. Ultrasonic (Supersonic vibration)
  6. Oscillator
  7. Venturi
  8. Mixed vapor direct contact condensation

Pressurized dissolution method

This method of ultrafine bubble generation is based on the principles of Henry`s Law, which relates the concentration of a gas to the partial pressure. This means that more gas can be dissolved into a solution at a higher pressure. The principle of the ultrafine bubble generator is as follows: Via a venturi system the liquid and the gas is mixed together, in the next step in the mixing box the gas is melted into the water via pressurization. In the last step via a nozzle the water and gas is discharged. Due to drastic drop in pressure of the supersaturated liquid gas solution, the gas is expelled as fine bubbles and ultrafine bubbles in the liquid. The figure illustrates the process.

  1. Liquid is pumped into the unit under pressure.
  2. By narrowing the size of the pipe, the speed of the incoming liquid flow is increased, which converts most of the pump pressure into dynamic pressure, thus reducing static pressure and air being suctioned through negative pressure.
  3. After the liquid and suctioned gas become saturated with bubbles, the liquid/gas flow is sent through a wider pipe to reduce the speed of the flow, where dynamic pressure is converted back to static pressure and the process of pressurized dissolution of gas takes place.
  4. After the gas is completely dissolved into the liquid, the liquid/gas is ejected at once using atmospheric pressure, causing the liquid to become over-saturated, and massive ultra fine nano-bubbles are released.

 

 

Rotational flow

Rotational flow is also often called Swirl Method or Spiral Flow. This fine bubble generator generates bubbles according to the Bernoulli's principle. In fluid dynamics, Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. The principle is named after Daniel Bernoulli who published it in his book "Hydrodynamica" in 1738. Centuries later fine bubble generators are made based on this principle. The first product based on this technology is the Ranque-Hilsch Vortex Tube in 1933. Followed 50 years later by the Swirling jet flame. In the mid-nineties the first swirling type micro-bubbles was invented in Japan.

The principle of the fine bubble generator is as follows: water is put into a cylindrical tank from the top-side and made to flow in a spiral downwards. From the center bottom of the cylinder the gas is sucked in. The rotating water is sheared to the top of the cylinder producing fine bubbles. However its generally acknowledged in the ultrafine bubble industry that the bubble concentration of the pressurized dissolution method is higher than the rotational flow.

Turbulent Static Mixer

The static mixer has its origin from mixing two liquids, the first patent for a static mixer was filed in 1965. Instead of mixing two liquids there is also the possibility of mixing a liquid and a gas. This technology is based on the principle of creating a vortex and bringing into the vortex a gas very effectively. Due to the turbulent flow gas will break the vortex and the collisions  between water and gas creates the nanobubbles. The benefits of the static mixers are that they have a relative simple design and they can treat large volumes of water at once with relative little energy compared to many of the other above nanobubble generators. Finally they are not sensitive to clogging. The acniti Turbiti technology is a combination of the turbulent static mixer and the Ejector Nozzle.

Ejector Nozzle

In the ejector nozzle nanobubble generator type, liquid flow channels in the cylindrical generator are designed to shrink and stepwise enlarge. The gas is brought in under negative pressure at the most reduced pressure point and reduced to a number of nanobubbles by cavitation. In this device the water flow is highly turbulent and the gas is reduced to nanobubbles by cavitation. Ejector nozzles are closely related to hydrodynamic cavitation generators, with this method cavitation is generated by the flow of liquid through a simple geometry under controlled conditions. In this nanobubble generator when the pressure falls below the vapor pressure of the liquid, the liquid flashes, generating a number of cavities. The cavities collapse when the pressure recovers. The collapse of the cavitation bubbles starts some physicochemical effects such as shock waves, shear forces and chemical reactions. Free radicals are sometimes generated by the these processes.

ultrafine bubble generator | nanobubble generator | micro bubble generator | static mixer | rotational flow | pressurized dissolution method |

Young plants growing with turbiti nanobubbles for better results

Acniti partner Foreport in Taiwan conducted a vegetables young plant cultivation trial, irrigating with oxygen nanobubbles. The nanobubble irrigation water had a DO of 20 ppm versus the regular irrigation water which had 6.8 ppm. After 6 weeks results were taken it was concluded that the crop treated with nanobubbles was 25-30% heavier. The nanobubble irrigated crop also had a better developed root system which will lead to less root diseases and better survival rates during hot summers.

Testimonial Japanese flower grower nanobubbles

In Aichi Japan 3 flower growers are interviewed about using the acniti nanobubble generator. The testimonials are recorded in summer of 2019.

Video nanobubble sensor ALT software demonstration

The operation and configuration of the ALT nanobubble sensor is easy. The movie gives an overview of settings and control.

How to measure fine bubbles?

Nanobubbles can be measured by the same technology as measuring small particles. You can measure bubbles by camera (count pixel size) or laser (count blackout time), also as a simple method to know number index, you can refer information of turbidity. When you measure UFB, most common way is to analyze Brownian Motion.

暑い夏中ごく細かいバブルスは生産者の助けになります。

カーネーション生産者はナノバブルス灌漑システムによってフサリウムや枯れの対策を整えて、ステム、花サイズ、芽吹、ステムのボリューム、回転も改善します。2017/2018 ACNITIはtestで平均サイズ110nmの酸素ナノバブルスを灌漑システムの水に加え、養鱒酸素レベルを30ppmに上げました。

The zeta-potential important stuff for nanobubbles

The electrical properties of gas bubbles are important in determining the interaction of nano-bubbles if and when they merge together and how they interact with other materials such as solid particles or oil droplets. Knowledge about this helps application development in for example, protein skimmers, froth flotation, food processing, washing surfaces and purification.

ウルトラファインバブルと種子発芽への効果

Nanobubbles are useful in accelerating the metabolism of living organisms, but the mechanism is not yet well understood. In a study, they investigated the production of reactive oxygen species (ROS) by Nano Bubbles and the effect on seed germination. The conclusion of the study was seeds in nanobubble water had a higher germination rate than all those submerged in the different other conventional used solutions.

研究室デモンストレーション ミニGaLF

The miniGaLF is ACNITI`s entry level GaLF model designed for companies, universities, research institutes and individuals that want to learn about Ultrafine bubble technology. In this blog a movie is shown of the connections and the performance to create ultrafine bubble (nanobubbles) with high DO water.

葉先焼けのない魅力的なレタスを栽培する

Manoa lettuce is a lettuce variety susceptible to tipburn. Tipburn is the drying and dying of leaf tissue along the edges of the leaf. During a test at a grower in Hawaii it was shown that by increasing the DO levels and adding ultrafine bubbles, reduction of tipburn is realized and quality and production improvements are made.

違いは何?ウルトラファインバブル?ナノバブル?

Interested to know why nanobubbles are officially called ultrafine bubbles? In this article we explain the reasons why the ISO technical committee has decided to use the official name ultrafine bubbles instead of nanobubbles.

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バブルブーストによる衣類洗浄

Washing of surfaces and laundry is one of the promising areas were ultrafine bubbles can make a difference in the application. Reducing the amount of detergent, has a positive effect by reducing pollution, washing laundry without detergent, would greatly benefit the environment. Ultrafine bubbles can lower the surface tension of water, the large amounts of oxygen molecules in bubbles charge the water negative.

セルフクリーニング インレットフィルタ 解説

Self-cleaning filters prevent pumps from blocking and make aeration more efficient. These pump are also excellent as dewatering filters for drainage of tanks or flooded areas. This video explains the inner-workings of this smart water-filter.

セルフクリーニング インレットフィルタ 実演

Video: Self-cleaning inlet filter explained

ウルトラファインバブル生成器

There are various technologies to generate nanobubbles (ultrafine bubbles). This article gives an overview of the most used techniques, such as pressurized dissolution, static mixers, and rotational flow.

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ファインバブルを利用した長距離鮮魚輸送

A new innovative way to transport fish while sleeping is almost ready to go onto the market. A combination of CO2 and ultrafine bubbles make this possible.

高性能カメラで見るウルトラファインバブル

Nanobubbles movie, movie made with the Malvern NanoSight. Based on this movie the NanoSight internal software counts the number of bubbles to calculate the number concentration of bubbles and the bubble size.

ミニGaLF プラス

The miniGALF is IDEC`s entry level GaLF model designed for first experiences with nano bubble technology. The miniGaLF -Plus enables higher concentration of nano bubbles by multi-passes of water through the miniGaLF.

ファインバブルの革新

Imagine your kitchen floor or bathroom tiles being cleaned by very tiny bubbles. Sounds great, a new technological era is dawning.

スマートな人は語る 気泡とウォーターイノベーション

Bubbles are all around us, in our foods, beer, pop drinks bread and cheese, but also in the bricks of our house. Bubbles are gas-filled cavities in water, the lifetime of a bubble is short at most a few minutes, only ultra-fine bubbles are stable for longer periods like months, that is making them very special and that enables us to change the properties of water.