Hollow Electrode Assembly for Plasma Generation
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Solution Overview
Problem
Existing electrodes in plasma generation systems face overheating issues, leading to reduced lifespan and limited analysis times due to the lack of effective thermal management during plasma discharge.
Innovation Solution
A hollow electrode assembly with a conduit for supplying fresh, non-ionized gas that is thermally cooled, featuring a metal or metal alloy casing with controlled porosity for gas effusion, which helps in extending anode life and enabling longer analysis times by regulating gas flow and pressure differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional electrodes are used in plasma generation, then plasma discharge can be achieved, but the electrodes overheat leading to reduced lifespan and limited analysis times
Solution Approach 1:
The electrode assembly incorporates a porous structure that allows fresh, non-ionized gas to permeate through the electrode body. This porous design enables internal gas flow paths that facilitate convective cooling throughout the electrode volume, effectively removing heat generated during plasma discharge and preventing thermal overload while extending operational lifespan.
Solution Approach 2:
The invention employs gas flow through the electrode assembly to achieve thermal management. By introducing fresh gas through conduits and allowing it to flow through the porous electrode structure, the system uses the kinetic energy and thermal properties of the moving gas to cool the electrode internally, replacing the conventional external cooling methods with an integrated pneumatic cooling approach.
2Temperature
If gas flow is increased through the electrode to improve cooling, then electrode temperature decreases, but gas pressure control becomes more challenging
Solution Approach 1:
The porous structure provides distributed flow paths that reduce pressure drops compared to confined channels. The interconnected pore network allows gas to flow through the electrode with minimal resistance, enabling effective cooling at lower pressure differentials and simplifying pressure control while maintaining high gas flow rates for thermal management.
Solution Approach 2:
The system dynamically balances gas flow rate and pressure differential to optimize both cooling efficiency and pressure control. By adjusting operational parameters such as gas source pressure and flow rate, the system adapts to maintain optimal thermal conditions without exceeding pressure control capabilities, achieving effective cooling under dynamically adjusted conditions.
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 solution effectively thermally cools the electrodes, extending their lifespan and enabling longer analysis times by controlling gas flow and pressure differentials, while also shielding the gas inside the electrode from ionizing plasma and impinging ions and electrons.
Implementation Method 1
at least one conduit for the supply of fresh, non-ionized gas to a plasma discharge from the electrode
Implementation Method 2
The gas passing the electrode goes from a higher gas pressure environment inside the electrode to a lower gas pressure environment on the outside of the electrode
Implementation Method 3
If a selected amount of porosity is introduced into the metal or metal allow casing during casting, Fick's law of diffusion further governs the pressure differential between the internal high pressure of the electrode and the surrounding vacuum plasma
Implementation Method 4
an effusion membrane through which the non-ionized gas can pass to supply the plasma discharge from the electrode
Implementation Method 5
The non-ionized gas comprises ions and electrons which are thermally cooled by the assembly
Implementation Method 6
the electrode is used as an anode and the casing shields the gas inside the electrode from the ionizing plasma and impinging negative ions and electrons from a cathode
Data Source
AI summary
A hollow electrode assembly through which gas from a gas supply can pass and be effused across the casing of the electrode for supplying a gas for a plasma discharge. The gas passing the electrode goes from a higher gas pressure environment inside the electrode to a lower gas pressure environment on the outside of the electrode. The casing of the electrode through which the gas effuses can be a metal or metal allow which provides for a controlled flow of the gas through the wall. The flow rate of the gas can be controlled by one or more of the porosity of the metal or metal alloy used, the type of gas used, the pressure differential between the inside and outside of the electrode, and the temperature of the system. The electrode assembly can be used in and high temperature plasma generators.