In-Liquid Plasma Device Using Gas-Phase Isolation
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Solution Overview
Problem
Conventional in-liquid plasma generation techniques face instability and inefficiency due to electrode components dissolving into the liquid and fluctuating plasma density, as electrodes are often submerged and subject to changing liquid conditions.
Innovation Solution
An in-liquid plasma generation device with a projecting dielectric-covered electrode and a surrounding electrode isolated from the liquid, forming a plasma generation field through which gas is introduced, preventing electrode dissolution and stabilizing plasma generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrodes are placed in direct contact with the liquid for plasma generation, then plasma can be generated, but electrode components dissolve into the liquid causing contamination
Solution Approach 1:
A gas layer is introduced as an intermediary medium between the electrode and the liquid. The electrode generates plasma in the gas phase, and the resulting chemically active species are transferred to the liquid through the gas-liquid interface, preventing direct contact between the electrode and liquid while maintaining plasma generation effectiveness
Solution Approach 2:
The gas bubble acts as a flexible barrier or shell that isolates the electrode from the liquid. This gas envelope allows electrical discharge to occur in the gas phase while preventing electrode material from dissolving into the liquid, effectively separating the plasma generation zone from the liquid treatment zone
2Productivity
If electrodes are submerged in liquid for plasma generation, then plasma can be produced, but the plasma density and amount become unstable due to changing liquid conditions
Solution Approach 1:
The gas phase serves as a stable intermediary medium for plasma generation, decoupling the plasma generation process from the variable liquid environment. This allows plasma to be generated in the more stable gas phase while still achieving liquid treatment through transfer of chemically active species
Solution Approach 2:
The system separates the plasma generation function (in gas phase) from the liquid treatment function (at gas-liquid interface). This segmentation allows each process to occur in its optimal environment, with plasma generation in the stable gas phase and chemical transfer at the interface
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 configuration enables highly efficient and stable plasma generation, producing a liquid rich in active species with enhanced plasma generation efficiency and stability, preventing electrode material dissolution and maintaining consistent plasma density.
Implementation Method 1
a plasma generation field in which a plasma generation electric field is formed by applying a voltage to between the electrodes
Implementation Method 2
a discharge caused by applying a voltage is a dielectric barrier discharge
Implementation Method 3
generating plasma in a gas supplied into a liquid
Data Source
AI summary
An in-liquid plasma generation device includes a housing which holds a liquid in an internal space, a gas supply tube which includes an opening in the internal space and discharges a gas into the liquid through the opening, a first electrode which has projecting part projecting into the internal space via the opening from inside of the gas supply tube, the projecting part including a conductor covered by a dielectric, a second electrode which surrounds the projecting part of the first electrode and includes a conductor isolated from the liquid by a dielectric, and a voltage applier which applies a voltage to between the first electrode and the second electrode. A space between the projecting part and the second electrode is a flow passage in which the gas discharged from the opening flows.