Fuel Cell Separator Flow Channel with Island Patterns for Gas Mixing
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Solution Overview
Problem
Existing fuel cell separators suffer from laminar flow leading to inefficient gas utilization and require additional equipment for fuel recirculation, which increases costs and complexity.
Innovation Solution
A separator with a flow channel structure featuring alternating column-shaped patterns with different spacing distances from the channel walls, creating irregular flow velocities and uniform flow quantities, enhancing turbulent flow and fuel concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a linear flow channel is used in the separator, then the structure is simple and easy to manufacture, but laminar flow occurs causing poor gas circulation and low fuel utilization efficiency
Solution Approach 1:
The flow channel is segmented into multiple sub-channels by introducing pattern structures (ridges or protrusions) that divide the single linear channel into parallel flow paths. This segmentation creates multiple flow streams that can be independently controlled, improving gas distribution and fuel utilization while maintaining manufacturing simplicity through modular pattern replication.
Solution Approach 2:
The invention transitions from a two-dimensional linear flow channel to a three-dimensional structured channel by adding vertical patterns (ridges protruding into the channel). This dimensional addition creates complex flow patterns including vortexes and turbulence, transforming the flow regime from simple laminar to enhanced mixed flow, thereby improving gas circulation and fuel utilization efficiency.
2Productivity
If a circulation cycle for fuel reuse is introduced, then fuel utilization efficiency is improved, but additional equipment and costs are required
Solution Approach 1:
The separator structure itself provides the circulation function through its built-in pattern geometry. The ridges or protrusions create vortexes and turbulence that naturally promote fuel circulation and mixing within the channel, eliminating the need for external circulation pumps or separate circulation cycles. The system serves its own circulation needs through its structural design.
Solution Approach 2:
The circulation function is merged with the flow channel structure by integrating pattern elements directly into the separator. The same component that guides fuel flow also generates the turbulence and vortexes needed for circulation, combining multiple functions (flow guidance, mixing, circulation promotion) into a single integrated structure, thereby reducing equipment complexity and cost.
3Stability of the object's composition
If uniform flow velocity is maintained in the channel, then flow distribution is stable, but fuel concentration becomes uneven and membrane drying occurs during low humidity operation
Solution Approach 1:
The pattern structures are designed with asymmetric geometries where ridges or protrusions have varying heights, widths, or spacing along the channel length. This asymmetry creates localized variations in flow velocity and turbulence intensity, promoting better fuel mixing and concentration distribution while maintaining overall flow stability. The asymmetric patterns prevent dead zones and ensure uniform fuel delivery to the membrane.
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 improved flow channel structure ensures uniform flow quantity and irregular flow velocity, increasing fuel cell efficiency and preventing membrane drying during low humidity operations.
Implementation Method 1
enhancing turbulent flow and fuel concentration
Implementation Method 2
a gas flow occurs without circulation due to the generation of laminar flow
Data Source
Figure 1~2
Figure 3(a)~4
Figure 5(a)~5(b)
AI summary
The present invention relates to a separator for a fuel cell and a fuel cell including the same, and in particular, by forming an island-type pattern in a flow channel formed in a separator for a fuel cell, and inducing irregular flow velocity distribution and uniform flow quantity distribution in the flow channel, a fuel cell efficiency and performance may be enhanced, and a drying phenomenon may be prevented during fuel cell operation.