Film Boiling Fine Bubble Generator
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Solution Overview
Problem
Existing fine bubble generation apparatuses have low efficiency in producing ultrafine bubbles smaller than 1 μm in diameter.
Innovation Solution
A fine bubble generating apparatus with a fluid flow passage including a narrow portion, a heating element capable of inducing film boiling, and a controlling unit to manage the heating process, which generates ultrafine bubbles by controlling the heating to produce film boiling, expansion, shrinkage, and subsequent shock waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods (cavitation, pressurized dissolution, high-speed swirl flow, microporous, gas-liquid two phase swirl flow) are used to generate fine bubbles, then fine bubbles can be produced, but the generation efficiency is low
Solution Approach 1:
The invention changes the physical parameters of the liquid by heating it to generate film boiling, which creates ultrafine bubbles through phase change. This thermal parameter change enables high-efficiency generation of ultrafine bubbles with concentrations exceeding 10^12 bubbles/mL, resolving the contradiction between generation efficiency and bubble concentration.
Solution Approach 2:
The invention utilizes film boiling phase transition where the liquid undergoes rapid vaporization and condensation cycles. This phase transition mechanism generates extremely fine bubbles (1-100 nm) with high concentration and efficiency, overcoming the limitations of conventional mechanical and cavitation-based methods.
2Productivity
If film boiling is generated by heating to produce ultrafine bubbles, then generation efficiency and concentration improve, but energy consumption increases
Solution Approach 1:
The invention employs periodic heating and cooling cycles to generate film boiling repeatedly. The heating part periodically heats the liquid to induce film boiling, followed by natural cooling phases. This periodic action maintains high ultrafine bubble generation efficiency while managing energy consumption through cyclical rather than continuous heating.
Solution Approach 2:
The invention ensures continuous ultrafine bubble generation by maintaining a circulation system where liquid continuously passes through the heating part. This continuous circulation allows sustained film boiling and ultrafine bubble production without interrupting the useful action, optimizing energy utilization over time.
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 apparatus efficiently generates highly concentrated ultrafine bubbles with high gas-liquid interface energy, maintaining their stability and concentration over time, enabling their use in various applications.
Implementation Method 1
the controlling unit controls the heating part to generate film boiling in the liquid to generate ultrafine bubbles
Implementation Method 2
generating an internal pressure in the film boiling bubble, thereby generating the film boiling bubble. Subsequently, the generating unit generates ultrafine bubbles caused by expansion and shrinkage of the film boiling bubble
Data Source
AI summary
The present invention provides a fine bubble generating apparatus capable of generating fine bubbles efficiently. The present invention includes a fluid flow passage that includes a narrow portion in at least a part thereof, a heating part capable of heating a liquid flowing through the fluid flow passage, and a controlling unit that controls the heating part. The controlling unit controls the heating part to generate film boiling in the liquid to generate ultrafine bubbles.