Bubble Generation Device Using Drawer for Ultrafine Bubbles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bubble generation devices require high pump discharge pressure and complex structures to achieve high-density ultrafine bubbles, resulting in low flow rates and inefficient generation of bubbles with diameters less than 1 μm.
Innovation Solution
A tubular member with a drawer having a narrower passage in the flow direction, where the gas component is dissolved and bubbles are generated due to negative pressure, then crushed by turbulent flow and shock waves, allowing for the production of ultrafine bubbles with a simple configuration and low pump pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a porous membrane is used to generate fine bubbles, then bubble generation is achieved, but bubbles of 100 μm or more are also generated due to poor wetting characteristics, high viscosity, or high surface tension
Solution Approach 1:
The invention replaces the static mechanical porous membrane system with a dynamic system using a liquid pump to circulate liquid through a flow path. Bubbles are generated by the dynamic interaction between gas supply and liquid flow, rather than by passive diffusion through a porous structure. This allows consistent fine bubble generation (10-100 μm) regardless of liquid properties such as viscosity or surface tension.
2Manufacturing precision
If ultrasonic waves are used to generate fine bubbles, then fine bubbles are generated, but large energy is required and temperature increase and instrument damage occur
Solution Approach 1:
The invention replaces the ultrasonic vibration system with a hydraulic system using a liquid pump. The pump circulates liquid through a controlled flow path where gas is introduced, and bubbles are generated by the mechanical action of liquid flow and pressure changes. This mechanical-hydraulic approach consumes less energy and avoids the thermal effects and instrument damage associated with ultrasonic waves.
3Manufacturing precision
If shear flow or pressurization dissolution is used to generate fine bubbles, then fine bubbles are generated, but large energy is required for liquid circulation
Solution Approach 1:
The invention uses a dynamic flow path design where the pump circulation rate is optimized to match the bubble generation requirements. The flow path dimensions and gas supply rate are dynamically adjusted to achieve efficient bubble generation at lower pump energies compared to static shear flow or pressurization dissolution systems.
4Quantity of substance
If a complex device structure is used to achieve high-density ultrafine bubbles, then bubble density increases, but flow rate decreases and pump discharge pressure requirement increases
Solution Approach 1:
The invention divides the bubble generation process into distinct stages within the flow path: gas introduction zone, bubble formation zone, and bubble refinement zone. This segmentation allows each section to be optimized for its specific function, achieving high bubble density while maintaining overall system flow rate and reducing pump discharge pressure requirements.
Solution Approach 2:
The invention extends the bubble generation process along the flow path dimension rather than concentrating it in a single point. By distributing bubble generation and refinement activities along the length of the flow path, the system achieves high bubble density without creating bottlenecks that would reduce flow rate or require excessive pump pressure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the generation of high-density ultrafine bubbles with diameters less than 1 μm in a short time without requiring high pump discharge pressure, achieving a bubble density of 981 million/mL with a simple device configuration.
Implementation Method 1
a gas component contained in the liquid is dissolved in the liquid by pressure-feeding the liquid to the drawer
Implementation Method 2
bubbles are then evolved due to a decrease in pressure in the drawer
Implementation Method 3
turbulent flow is generated in the liquid in the drawer to crush bubbles in the liquid by shearing force thereof
Implementation Method 4
bubbles are crushed by a shock wave caused by transonic flow occurring in the liquid that has exited from the drawer
Data Source
AI summary
A bubble generation device includes: a metallic narrow tube (10) through which water passes; and a pump that pressure-feeds the water containing a gas component into the metallic narrow tube (10). A drawer (11) in which a path through which the water passes is narrower than the front and the rear thereof in the flow direction of the water is disposed on the inside of the metallic narrow tube (10). The drawer (11) has the rectangular cross section orthogonal to the flow direction. The gas component contained in the water is dissolved in the water by pressure-feeding the water to the drawer (11), bubbles are evolved due to a decrease in pressure in the drawer (11), turbulent flow is generated in the water in the drawer (11) to crush bubbles in the water by the shearing force thereof, and bubbles are crushed by a shock wave caused by transonic flow occurring in the water that has exited from the drawer (11).