Interdigitated Flow Channel Plate for Uniform Reactant Gas Flow
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Solution Overview
Problem
Existing electrochemical cells face challenges in maintaining uniform reactant gas flow and reducing pressure loss across the flow channel, leading to inefficiencies in power generation and potential system failures due to non-uniform power distribution and increased pressure distribution.
Innovation Solution
The flow channel plate design features alternating supply and discharge flow channels with varying cross-sectional areas and shapes to stabilize the flow rate and pressure difference, ensuring uniform gas flow to the gas diffusion layer without increasing resistance, using interdigitated flow fields with specific width and depth adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple linear flow channel structure is used, then the device complexity is reduced, but the diffusion overvoltage increases and power distribution becomes non-uniform
Solution Approach 1:
The flow channel is segmented into multiple sections with different cross-sectional areas. The channel is divided into a first section with a first cross-sectional area and a second section with a second cross-sectional area that is larger than the first. This segmentation allows optimization of gas flow distribution across different regions of the gas diffusion layer, reducing diffusion overvoltage while maintaining manageable structural complexity.
Solution Approach 2:
Different sections of the flow channel are assigned different local properties (cross-sectional areas) to optimize performance at each location. The first section has a smaller cross-sectional area to promote gas flow into the gas diffusion layer at that region, while the second section has a larger cross-sectional area to accommodate increased flow demand. This local quality variation ensures uniform power distribution and reduces diffusion overvoltage throughout the entire channel.
2Loss of energy
If the flow channel cross-sectional area is increased to reduce resistance, then the flow rate increases, but the pressure difference becomes unstable and power distribution becomes non-uniform
Solution Approach 1:
The cross-sectional area parameter of the flow channel is changed along its length to optimize performance. The channel transitions from a first cross-sectional area in the first section to a second cross-sectional area in the second section, where the second area is larger. This parameter change stabilizes the pressure difference between the flow channel and the gas diffusion layer, ensuring uniform gas flow distribution and preventing non-uniform power distribution while reducing overall pressure loss.
3Manufacturing precision
If uniform cross-sectional area is maintained throughout the flow channel, then the manufacturing precision is simplified, but the gas flow distribution becomes non-uniform and power generation efficiency decreases
Solution Approach 1:
The flow channel is designed with different local cross-sectional areas to optimize gas flow distribution. The first section has a first cross-sectional area and the second section has a second cross-sectional area that is larger, creating localized flow optimization zones. This local quality variation improves power generation efficiency by ensuring uniform gas distribution to the gas diffusion layer, while the gradual transition between sections maintains manufacturability.
Solution Approach 2:
The flow channel cross-sectional area is made dynamic rather than static, varying along the length of the channel to match the changing flow requirements. The transition from the first cross-sectional area to the second larger cross-sectional area creates a dynamic flow distribution pattern that optimizes gas delivery to different regions of the gas diffusion layer, thereby improving overall power generation efficiency.
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 stabilizes reactant gas flow, reduces pressure loss, and enhances power generation efficiency by maintaining uniform power distribution and reducing the risk of system inefficiencies, thereby improving the durability and performance of electrochemical cells.
Implementation Method 1
a static pressure difference between the supply flow channel and the discharge flow channel that have the rib in between creates a flow to the gas diffusion layer
Implementation Method 2
By forming the structure such that a supply gas all passes through a gas diffusion layer, a forced convection to the gas diffusion layer below a rib (separator) is generated
Implementation Method 3
a partial pressure of the reactant gas in a vicinity of a three-phase boundary where the electrochemical reaction takes place can be increased
Data Source
AI summary
A flow channel plate according to the present embodiment includes a flow channel for a reactant gas supplied to an electrochemical reactor. The flow channel includes a supply flow channel having a closed flow channel end on a downstream side and a discharge flow channel having a closed flow channel end on an upstream side. The supply flow channel and the discharge flow channel are arranged side-by-side in a direction substantially perpendicular to a direction in which the reactant gas flows. At least one of a cross sectional area on the downstream side of the supply flow channel being smaller than a cross sectional area on an upstream side of the supply flow channel or a cross sectional area on a downstream side of the discharge flow channel being greater than a cross sectional area on the upstream side of the discharge flow channel is satisfied.