Electrolysis Flow Path for Elastic Turbulence Bubble Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The formation of gas bubbles on electrode surfaces in electrochemical cells reduces the available surface area for electrochemical reactions, leading to decreased current density due to masking and impeded gas movement, particularly in systems with porous electrodes.
Innovation Solution
Employing elastic turbulence in the flow of electrolyte liquids within electrochemical half-cells by using solutes like high molecular weight polymers or viscoelastic surfactants, combined with flow paths that induce changes in flow direction, to enhance gas release from solid surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the surface area of an electrode is increased within a constant outline size, then the current density is improved, but the permeability of the electrode decreases causing a higher pressure-drop across the electrode
Solution Approach 1:
The patent applies elastic turbulence, a dynamic flow regime, to enhance gas bubble detachment from electrode surfaces. By inducing transient, chaotic flow patterns through elastic instabilities in the electrolyte, the system dynamically disrupts bubble adhesion without requiring static increases in electrode surface area or high pressure drops, thus resolving the contradiction between current density and energy consumption.
Solution Approach 2:
The patent changes the flow regime parameter from laminar to elastic turbulent flow by controlling Reynolds number and elastic properties of the electrolyte. This parameter change enables effective gas removal at lower pressure drops, maintaining high current density while reducing the energy required for liquid circulation compared to conventional high-pressure drop designs.
2Productivity
If gas bubbles adhere to the solid surface, then the surface area available for electrochemical reaction is reduced, but the gas bubbles remain on the surface until they reach a size at which their buoyancy overcomes the adhesion
Solution Approach 1:
Elastic turbulence acts as a form of mechanical disturbance that vibrates and disrupts the interface between gas bubbles and the electrode surface. This vibration prevents stable bubble adhesion and promotes earlier detachment, keeping the electrode surface area available for electrochemical reactions and maintaining high current density.
Solution Approach 2:
The patent replaces the conventional reliance on gravity-driven buoyancy (mechanical force) with elastic turbulent flow patterns. Instead of waiting for bubbles to grow large enough for buoyancy to overcome adhesion, the elastic turbulence provides continuous mechanical disruption that substitutes for and enhances the natural buoyancy mechanism, enabling smaller bubbles to detach earlier and maintain more active surface area.
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
Elastic turbulence maintains a higher electrode surface availability for reactions, improving current density and reducing energy consumption by facilitating earlier detachment of gas bubbles, thus enhancing the efficiency of gas production.
Implementation Method 1
the liquid is in a condition of elastic turbulence while it is in contact with the one or more solid surfaces
Implementation Method 2
gas is formed from liquid in an electrochemical half-cell the gas is initially in solution in the liquid. The liquid becomes supersaturated with the gas and bubbles begin to form on the solid surface where the gas is first formed
Implementation Method 3
The liquid becomes supersaturated with the gas and bubbles begin to form
Implementation Method 4
Interfacial tension causes the very small bubbles to adhere to the solid surface
Implementation Method 5
they remain on the surface until they reach a size at which their buoyancy overcomes the adhesion to the solid surface
Data Source
Figure 1~2
Figure 3~6
Figure 4
AI summary
An electrochemical half-cell operates to form a gas at a solid surface which may be an electrode. The electrolyte liquid contains an additive, which is a high molecular weight flexible linear polymer or a viscoelastic linear surfactant. A flow path through the half-cell is configured to compel flow of liquid through the half-cell to make a succession of changes of direction. The electrolyte liquid is pumped through the half-cell at rate which is sufficient that the additive and flow path configuration put the flowing electrolyte in a state of elastic turbulence which causes bubbles of gas to detach from the surface on which they are formed while they are still small, freeing the surface area for further reaction. The half-cell may be part of an electrolyser making hydrogen and oxygen from water.