Plasma generator
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Solution Overview
Problem
Existing methods for forming a plasma discharge in liquids suffer from instability due to the destabilizing effect of electric current flow, leading to periodic breakdowns and damage to the cathode.
Innovation Solution
A plasma generator with a stabilizing electrode is used to stabilize the plasma discharge within a fluid, preventing electrical breakdown and cathode damage by confining the interface between the gas-vapor and liquid phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plasma discharge is formed in a liquid using conventional electrode methods, then plasma treatment of the liquid can be achieved, but the plasma discharge becomes unstable due to electric current flow through the liquid
Solution Approach 1:
The invention divides the single plasma discharge region into two separate regions by introducing a stabilizing electrode: a first plasma discharge region between the cathode and stabilizing electrode, and a second plasma discharge region between the stabilizing electrode and anode. This segmentation isolates the unstable interface between gas-vapor and liquid phases to one location, preventing it from disrupting the entire plasma discharge system.
Solution Approach 2:
The stabilizing electrode acts as an intermediary element between the cathode and anode. It provides a controlled interface for the gas-vapor liquid phase boundary and manages the electric current distribution, thereby stabilizing the plasma discharge without preventing the necessary current flow through the liquid for treatment.
2Power
If voltage is increased to re-initiate plasma discharge after breakdown, then plasma intensity increases, but electrical breakdown and arcing occur causing cathode damage
Solution Approach 1:
By segmenting the plasma discharge into two regions, the invention allows independent control of plasma intensity in each region. The first region can be maintained at optimal intensity for treatment without risking catastrophic breakdown, as the stabilizing electrode prevents uncontrolled voltage escalation that would lead to arcing and cathode damage.
Solution Approach 2:
The stabilizing electrode provides a protective buffer that prevents direct arcing between the cathode and anode. It absorbs and distributes the electrical stress, cushioning against sudden voltage spikes that would otherwise cause catastrophic cathode damage while still allowing sufficient plasma intensity for effective treatment.
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 stabilizing electrode significantly enhances the stability of plasma initiation and maintenance, preventing electrical breakdown and cathode damage, thus improving the efficiency and reliability of plasma treatment processes.
Implementation Method 1
plasma discharge is formed around the cathode, which has a negative electric potential
Implementation Method 2
The electrical circuit for a two-phase medium (gas-vapor and liquid) can be represented as two active electrical resistances
Implementation Method 3
at the ends of which a high electric potential gradient and high intensity electric field is created
Implementation Method 4
similar to the burning of an electric corona in air at the tip of a corona electrode
Implementation Method 5
The heating of the liquid is caused by both the presence of conduction currents in the liquid and electrical currents of the plasma at the cathode
Implementation Method 6
a gas vapor bubble forms in the liquid around the cathode as the liquid is heated to a temperature above boiling
Implementation Method 7
increase in voltage leads to electrical breakdown between the cathode and the anode, a sharp increase in current and ultimately arcing between the anode and the cathode
Data Source
AI summary
A plasma generator includes a cathode, an anode, and a stabilizing electrode. The stabilizing electrode stabilises a region of plasma within a fluid. Methods of plasma generation and uses thereof are also provided.