Microbubble Generator Slit Geometry for Low-Pressure Water Flow
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Solution Overview
Problem
Existing bubble generators face inefficiencies in generating microbubbles in water flows, particularly in tap water without the need for additional pressure or devices like pumps.
Innovation Solution
A bubble generator design featuring a tubular main body with radially extending slits and protruding columns, where the columns' protrusion gradually reduces towards the upstream side and include recesses on their downstream surfaces, creating vacuum areas that enhance microbubble generation by increasing water flow velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If columns protrude from the inner peripheral surface to form slits, then microbubble generation is improved, but the structure becomes more complex and difficult to manufacture
Solution Approach 1:
The inner peripheral surface is segmented into multiple columns that protrude to form slits between them. This segmentation creates multiple flow restriction points that generate vacuum areas, thereby improving microbubble generation efficiency while maintaining a relatively simple cylindrical overall structure that is easy to manufacture.
Solution Approach 2:
The columns have varying protrusion amounts, with the protrusion gradually reducing from the periphery toward the upstream side. This local variation in geometry optimizes the flow characteristics and vacuum area formation at different locations, improving microbubble generation while the gradual transition facilitates easier manufacturing compared to abrupt geometric changes.
2Ease of manufacture
If the protrusion amount of columns is uniform, then manufacturing is simpler, but vacuum area formation and microbubble generation are insufficient
Solution Approach 1:
The columns are designed with asymmetric protrusion characteristics, where the protrusion amount varies along the flow direction (gradually reducing from periphery toward upstream). This asymmetric design creates more effective vacuum areas by optimizing flow compression and expansion patterns, thereby improving microbubble generation efficiency while remaining manufacturable through gradual geometric transitions.
3Productivity
If recesses are added to downstream-side surfaces of columns, then vacuum area creation is enhanced, but device complexity increases
Solution Approach 1:
Recesses are added to the downstream-side surfaces of the columns, introducing a new geometric dimension that enhances vacuum area formation. These recesses create additional low-pressure zones where water flow can expand, improving microbubble generation efficiency. The recesses are integrated into the existing column structure, adding functionality without significantly increasing overall device complexity.
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
The design effectively generates a sufficient amount of microbubbles in water flows, even at low pressures, without the need for external devices, improving microbubble generating efficiency and stability.
Implementation Method 1
a vacuum area is created downstream from the restrictor according to Bernoulli's principle, and gases dissolved in the water are released due to a cavitation effect
Implementation Method 2
gases dissolved in the water are released due to a cavitation effect (effect of reduced pressure) so that microbubbles are generated
Data Source
AI summary
The purpose of the present disclosure is, in a bubble generating device provided with a bubble generating unit for generating minute bubbles in water flowing through the inside of the cylindrical main body unit, to improve the bubble generating efficiency of the bubble generating unit. Provided is a bubble generating device provided with a cylindrical main body unit and a bubble generating unit disposed within the main body, wherein: the bubble generating unit is provided with slits extending radially centered on one point within the main body unit in a cross-sectional plane of the main body unit, and a column part protruding from the inner peripheral surface of main body unit and formed on the peripheral edge of the slits; and the amount of protrusion of the column part is gradually reduced toward the upstream side from the peripheral edges of the slits, and the column part has a recessed part formed on the downstream surface.