Fuel Cell Separator Projections for Vertical Air and Water Flow
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Solution Overview
Problem
Current fuel cell separators do not effectively manage the vertical flow of air and product water, leading to reduced gas utilization and performance in fuel cell stacks.
Innovation Solution
A separator design with strategically placed projections in flow channels to facilitate vertical air flow between adjacent channels, increasing residence time and gas utilization by ensuring smooth air movement and easy product water discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional separator design without projections is used, then manufacturing is simpler, but vertical air flow between adjacent flow channels is not established, reducing gas utilization and performance
Solution Approach 1:
The separator incorporates projections at specific locations within flow channels rather than uniformly across the entire separator. These localized projections create vertical air flow between adjacent flow channels at critical points, improving gas utilization without requiring complex modifications throughout the entire separator structure.
Solution Approach 2:
The separator is divided into multiple flow channels with discrete projections positioned at predetermined points within each channel. This segmentation allows independent optimization of flow patterns in different regions, enabling vertical air flow establishment while maintaining overall structural simplicity.
2Duration of action of moving object
If projections are added to facilitate vertical air flow, then residence time and gas utilization increase, but manufacturing complexity increases
Solution Approach 1:
The projections are designed with specific geometric parameters (height, width, spacing, and positioning within flow channels) that are optimized to create effective vertical air flow and extend residence time. By carefully controlling these parameters, the design achieves improved gas utilization while maintaining manufacturability through standardized projection geometries.
3Stability of the object's composition
If projections are positioned at corresponding points in adjacent flow channels, then flow symmetry is maintained, but product water discharge efficiency decreases
Solution Approach 1:
The projection positioning breaks the symmetric pattern by placing projections at non-corresponding points in adjacent flow channels. This asymmetric arrangement creates vertical air flow that enhances product water discharge efficiency by preventing water accumulation, while still maintaining overall flow balance through strategic positioning.
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 design enhances gas utilization and performance by stabilizing air flow and facilitating the discharge of product water, thereby improving the efficiency of the fuel cell stack.
Implementation Method 1
vertical flow of air between adjacent flow channels formed in the separator is established; thus allowing product water in the fuel cell stack to be easily discharged, residence time of gas introduced into the fuel cell stack increases
Implementation Method 2
hydrogen ions and oxygen ions are generated by catalyst, and the hydrogen ions and the oxygen ions electrochemically react with each other, thereby creating electrical energy and water (product water)
Data Source
AI summary
In an embodiment, a separator for a fuel cell includes a plurality of flow channels configured to flow gas or product water, and which are provided at a plurality of points with projections that project in first and second directions, wherein each of the plurality of flow channels is provided at set points thereof with a corresponding one of the projections but an adjacent flow channel is not provided with the projections at a point corresponding to the set point of the former flow channel, and some of the projections which project in one direction among the first and second directions are aligned on one straight line.