Helical Fine Bubble Generator Cavitation Mechanism
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Solution Overview
Problem
Existing fine bubble generators that externally introduce gas into a liquid require complex equipment and struggle to generate fine bubbles at high liquid pressures, as they need lower gas pressure than liquid pressure.
Innovation Solution
A fine bubble generator with a tubular shape and helical parts on both the outer and inner members, where the liquid flows between these helical parts, causing cavitation and generating bubbles without external gas introduction, utilizing the pressure difference and swirl flows to promote bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If gas is externally introduced into the liquid using a compressor, then fine bubbles can be generated in the liquid, but the equipment structure becomes complicated and the device cannot operate at high liquid pressures
Solution Approach 1:
The liquid itself serves as the medium to generate bubbles through cavitation, eliminating the need for external gas supply equipment. The high-speed liquid flow creates negative pressure zones that cause cavitation and bubble formation, making the system self-sufficient without compressors or external gas sources.
Solution Approach 2:
The mechanical gas compression system is replaced with a hydrodynamic cavitation system. Instead of using a compressor to force gas into the liquid, the invention uses the kinetic energy of high-speed liquid flow to create pressure differences that generate bubbles through cavitation, substituting mechanical compression with fluid dynamic effects.
2Quantity of substance
If gas is externally introduced into the liquid, then fine bubbles can be generated, but the liquid pressure must be lower than gas pressure which limits high pressure operation
Solution Approach 1:
Instead of introducing gas into the liquid at low pressure, the invention inverts the approach by using high-speed liquid flow to create negative pressure zones that generate bubbles. The liquid flow itself creates the pressure differential needed for cavitation, allowing operation at high liquid pressures where conventional gas introduction would fail.
Solution Approach 2:
The invention changes the pressure parameter dynamics by creating localized negative pressure zones through high-speed flow rather than maintaining overall low pressure. The high-speed liquid flow generates transient pressure drops at specific locations (inlet and outlet of the flow rate increasing portion) that trigger cavitation, enabling bubble generation even when the bulk liquid pressure is high.
3Device complexity
If a simple structure without external gas introduction is used, then equipment complexity is reduced, but fine bubble generation capability is lost
Solution Approach 1:
The high-speed liquid flow creates dynamic pressure fluctuations and vibrations that trigger cavitation. The rapid acceleration and deceleration of liquid through the flow rate increasing portion generates oscillating pressure fields that promote bubble formation and enhance the fine bubble generation capability while maintaining a simple structure.
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
Simplifies the structure, allows for the generation of fine bubbles under high liquid pressure, and increases the amount of bubbles produced, making it suitable for industrial and domestic use.
Implementation Method 1
cavitation occurs because of the decrease in pressure when the liquid flows out of the gap between the first helical part and the second helical part, and fine bubbles are generated in the liquid
Implementation Method 2
the liquid flowing near the inner surface of the outer member swirls along the first helical part, and the liquid flowing near the outer surface of the inner member swirls along the second helical part, and the cavitation is promoted by the swirl flows
Data Source
AI summary
A fine bubble generator for generating fine bubbles in a liquid without externally introducing gas. According to an embodiment, a liquid flows in a gap between a first helical part on an inner surface of an outer member having a tubular shape and a second helical part on an outer surface of an inner member in the outer member, so that cavitation occurs because of the decrease in pressure when the liquid flows out of the gap between the first helical part and the second helical part, and fine bubbles are generated in the liquid. In this process, the liquid flowing near the inner surface of the outer member swirls along the first helical part, and the liquid flowing near the outer surface of the inner member swirls along the second helical part, and cavitation is promoted by the swirl flows, and the amount of fine bubbles generated is increased.