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What is DDHRS?

The most recent methods to produce micro-bubbles are classified mainly into two ones. One way moves the water in a chamber to react with air introduced inside it, and the other one treats the stationary water. We adopt the former method, which is referred to "swirl water flow type". One of the most advantageous characteristics of this method is to enable to produce a large amount of micro-bubbles.
  In the developmental process of eco-Bubble®, we modified the inner structure of the nozzle that the swirl water flow reacts with the air introduced to inside it, and enabled to produce further larger amounts of micro-bubbles, which is referred to
   DDHRS (Dual-chamber/Dual-vortex High-speed Rotation System
 (Japanese pat. No. 4652478, July 7, 2011; U.S. pat. No. US8,939,436 B2, Jan. 27, 2015; China pat. No. ZL 2011 8 0033648.3, Dec. 17, 2014; Korea pat. No. 10-1407122, June 5, 2014)


The mechanisms of production of micro-bubbles by DDHRS
Dual-vortex is created in the inner chamber. The inner vortex can rotate much faster than the outer one, since the radius of the inner vortex is smaller than that of the outer one. The high speed rotation of the inner vortex creates the air column at the center of the vortex with a strong negative pressure, and realizes the increase of air intake and production of large amounts of micro-bubbles.
  The left picture is a demonstration model of the dual chamber made with a transparent acrylic plastic. It enables to observe what happens at the moment that micro/nano-bubbles are created in the inner chamber. When eco-Bubble®-400 works, air is introduced to the inner chamber through an air tube, and an air column is made by the high-speed rotating vortex in it. The top of the air column collapses due to a short of air supply when we decrease the air flow rate in the air tube using the air cock, and reacts with the swirling water.

A video clip: producing micro-bubbles in the chamber

               DDHRS data: download  

Where are the micro-bubbles produced in the nozzle ?


We put fine particles in the water, and work the micro/nano-bubble generator. The water with fine particles is introduced to the nozzle. This picture indicates that dual vortex is created in the nozzle and the inner vortex looks lighter than the outer one, due to higher density of fine particles created by faster rotation of the water.
  The top of the center of the air column looks milky-white, where micro-bubbles are produced.

Extremely high potential for dissolving oxygen gas


This figure compares the dissolving rate of oxygen gas into the water in a tank with 1.4 m3 of sea water in the three cases when the water was bubbled with eco-Bubble®-400 with DDHRS, a micro-bubble generator with SSRS (Singe-chamber/Single-vortex Rotation System), and an conventional diffuser. The bubbling by the micro-bubble generator with SSRS exhibited about two times faster DO dissolving rate than that of the conventional methods between 20% and 95% of DO saturation. The bubble using eco-Bubble®-400 with DDHRS realized further about three times faster DO dissolving rate than that of the micro-bubble generator with SSRS. The high-speed rotation of the inner vortex in the chamber of eco-Bubble®-400 creates a strong negative pressure to intake air from outside the nozzle, and realizes to produce a large amount of micro-bubbles in the water.

           DDHRS comparison data: download  

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