Bent Glow Discharge Cell Layout for Stable Plasma Exposure
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Solution Overview
Problem
Existing glow discharge cells suffer from rapid electrode degradation due to oxidation and incomplete gas exposure, leading to plasma stagnation and reduced effectiveness in applications such as ozone generation and chemical synthesis.
Innovation Solution
A glow discharge cell design featuring a bent glass tube configuration with a primary electrode encapsulated in the wall of one branch and a straight glass tube acting as both the gas inlet and plasma formation chamber, minimizing dead volume and allowing full gas flow exposure, while the secondary electrode is a hollow metal rod for improved gas circulation and reactant interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional glow discharge cell design is used with electrodes positioned in a straight tube, then the structure is simple, but the gas flow does not fully expose to the plasma formation chamber causing incomplete reaction and plasma stagnation
Solution Approach 1:
The cell is divided into distinct functional zones: a plasma formation chamber with bent configuration for complete gas exposure, a reaction chamber for chemical reactions, and separate electrode positioning areas. This segmentation allows each zone to optimize its function while maintaining overall system productivity.
Solution Approach 2:
The plasma formation chamber is configured in a bent or L-shaped arrangement rather than a straight line, adding spatial dimensionality to the gas flow path. This ensures complete exposure of the gas flow to the plasma while maintaining a relatively simple overall structure.
2Power
If the primary electrode is made of reactive metal for efficient plasma generation, then plasma generation is enhanced, but the electrode degrades rapidly due to oxidation
Solution Approach 1:
The primary electrode is extracted from direct contact with the oxidizing environment by positioning it within the plasma formation chamber where inert gas or controlled atmosphere prevails. The electrode material can be reactive for efficient plasma generation while being protected from oxidation by the controlled plasma environment.
Solution Approach 2:
An inert gas atmosphere or controlled plasma environment is maintained around the primary electrode during operation, preventing oxidation of the electrode material while allowing efficient plasma generation. The inert environment protects the electrode durability without compromising plasma generation efficiency.
3Stability of the object's composition
If the secondary electrode is solid for structural stability, then the structure is stable, but gas circulation is limited reducing reactant interaction
Solution Approach 1:
The secondary electrode is designed as a hollow cylindrical structure or thin-walled tube rather than a solid rod. This configuration maintains structural stability while creating internal channels that facilitate gas circulation and enhance reactant interaction with the plasma, improving overall productivity.
4Productivity
If the gas flow rate is increased to improve reaction completeness, then reaction efficiency improves, but plasma stability decreases leading to plasma extinction
Solution Approach 1:
The cell is segmented into a plasma formation chamber and a reaction chamber. The plasma formation chamber is optimized for plasma stability with controlled gas flow and electrode positioning, while the reaction chamber handles high flow rates for complete reactions. This segmentation allows both plasma stability and reaction completeness to be optimized simultaneously.
Solution Approach 2:
The bent configuration of the plasma formation chamber creates a longer effective path for gas exposure without increasing linear dimensions. This allows complete gas exposure and reaction efficiency while maintaining plasma stability through optimized flow distribution in the curved geometry.
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 design significantly reduces electrode sputtering, ensures complete gas exposure, and enhances plasma stability and durability, allowing for more efficient plasma generation and chemical reactions.
Implementation Method 1
an electrical voltage (also known as difference in potential) is applied between two electrodes in a glass tube, which contains a gas at low pressure... When said voltage exceeds a predetermined threshold value, called 'breakdown voltage'... then the ionisation of the gas becomes self-sufficient and the plasma glows with a coloured light
Implementation Method 2
a gas is subjected to a difference in potential that is sufficiently intense as to cause said gas to be ionised, at least partially, becoming a non-thermal plasma
Implementation Method 3
the formation of a non-thermal plasma from gas flow, is capable of producing the total breakdown/radicalisation of the molecules present therein, as well as the oxidation thereof. In fact, as a result of the high kinetic energy (between 1 and 10 eV) that the electrons acquire, the previously existing chemical bonds are broken, giving rise to radicals
Implementation Method 4
the previously existing chemical bonds are broken, giving rise to radicals that react chemically with the oxidative species that are present in the medium
Implementation Method 5
synthesis of chemical compounds... detection of substances... ozone (Os) generation for use as an oxidant or disinfectant
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a glow discharge cell comprising a gas evacuation chamber and a gas outlet port integrated in a first bent tube, the branches of which are perpendicular and with different diameters; a gas inlet port formed by a second straight tube along which a plasma is formed and which is partially inserted into the first branch of the first tube; and a primary electrode encapsulated in the first branch of the first tube and facing the second glass tube and being partially inserted therein.