Porous-Cooled Ozoniser Structure for Higher Ozone Yield
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Solution Overview
Problem
Existing ozonisers suffer from low ozone yield due to inefficient heat transfer and limited Reynolds number, leading to high temperature-dependent ozone decomposition and restricted coolant choices.
Innovation Solution
Incorporating a porous material in the cooling-fluid channel to enhance heat transfer and using a planar sandwich structure with high thermal conductivity dielectrics and electrodes, allowing for turbulent coolant flow and improved heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laminar coolant flow is used in the cooling-fluid channel, then the flow remains stable and easy to control, but the heat transfer efficiency is low due to limited heat conduction between layers
Solution Approach 1:
The patent introduces a porous material (such as porous ceramic or metal foam) into the cooling-fluid channel. This porous structure creates numerous small channels that force the coolant to flow through a tortuous path, dramatically increasing the surface area for heat exchange between the coolant and the dielectric/electrode. The porous structure also induces turbulence at the micro-scale, enhancing convective heat transfer while maintaining overall flow stability.
2Temperature
If the coolant flow rate is increased to improve heat transport, then more heat can be removed, but the Reynolds number remains low and water consumption becomes unacceptable
Solution Approach 1:
The porous material provides a large internal surface area within a compact volume, allowing efficient heat transfer at lower flow rates. The tortuous flow paths through the porous structure create micro-turbulence that enhances heat transfer coefficients, enabling effective cooling with reduced coolant consumption compared to conventional smooth-channel designs.
Solution Approach 2:
The porous material transforms the heat transfer from a primarily two-dimensional surface exchange to a three-dimensional volumetric process. The coolant flows through the entire volume of the porous structure, utilizing the internal surface area of pores for heat exchange, thereby dramatically increasing the effective heat transfer area without increasing the external dimensions of the cooling channel.
3Device complexity
If conventional cooling methods with separated gas and fluid channels are used, then the structure is simple, but the heat must be dissipated via the dielectric which limits cooling efficiency
Solution Approach 1:
The porous material acts as an intermediate structure that bridges the gap between the gas channel and fluid channel. It provides direct thermal coupling between the dielectric/electrode and the coolant while maintaining electrical isolation. The high surface area to volume ratio of the porous structure enables efficient heat transfer from the reaction zone to the coolant without requiring the heat to traverse the entire thickness of the dielectric material.
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
Significantly increases ozone yield and efficiency while reducing coolant consumption and eliminating the need for electrically conductive heat carriers, enabling higher gas pressures without damaging dielectrics.
Implementation Method 1
The porous material provides a plurality of channels through which the cooling fluid, such as water, can be conveyed, whereby it is ensured that not only the portion of the cooling fluid that is in direct contact with the dielectric in a laminar flow but also nearly the entire cooling-fluid flow participates in the heat transport. The porous structure itself also participates in the heat transport.
Implementation Method 2
A cooling fluid, such as water, serving as a heat carrier is then conveyed through the cooling-fluid channel so that the cooling fluid cools the surface of the first dielectric or the surface of the second electrode.
Implementation Method 3
it is possible to produce ozone in an electrical field. Ozonisers comprising a first and a second electrode, between which a first dielectric is arranged, are used for this purpose. A gas channel, through which an oxygen-containing gas can be conveyed, is arranged between the first dielectric and the first electrode. The gas, which may be ambient air, is conveyed through the gas channel and thus through the electric field generated by the two electrodes. Ozone forms in the electrical field.
Data Source
AI summary
The present invention relates to an ozoniser comprising a first and a second electrode between which a first dielectric is arranged, wherein between the first dielectric and the first electrode, a gas channel is arranged, through which an oxygen-containing gas can be conveyed, wherein a first cooling-fluid channel is provided, the wall of which is formed at least in sections by the first dielectric or the second electrode. In order to provide an ozoniser that can realize an increased ozone yield compared to the known devices, it is proposed according to the invention that the cooling-fluid channel is filled with a porous material.