Fuel Cell Manifold Baffle for Uniform Reactant Distribution
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Solution Overview
Problem
Existing fuel cell manifold designs face challenges in evenly distributing reactants like oxygen across the cell stack assembly, leading to potential local starvation and reduced operational life due to high velocity air expansion and increased complexity in channel additions.
Innovation Solution
A baffle system within the manifold with distinct portions of varying widths and lengths is used to create different flow distribution regions, with deflectors and seal members to redirect and secure airflow, ensuring uniform distribution to the fuel cell components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional channels are added to the manifold to improve reactant distribution, then reactant distribution is improved, but device complexity increases
Solution Approach 1:
The baffle is divided into multiple portions (first portion, second portion, third portion) with different widths perpendicular to the flow direction. This segmentation creates distinct flow distribution regions that address reactant distribution issues without adding complex manifold channels, thereby improving reliability while avoiding increased device complexity.
2Quantity of substance
If high velocity air is supplied into the manifold to increase reactant supply, then reactant supply is improved, but fluid flow distribution becomes uneven
Solution Approach 1:
Different portions of the baffle have different widths perpendicular to the flow direction, creating local variations in flow distribution characteristics. The first portion has a greater width than the second portion, which has a greater width than the third portion, allowing each region to handle the high velocity air flow appropriately and achieve uniform distribution despite high inlet velocity.
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 baffle system effectively distributes reactants uniformly across the fuel cell stack, preventing airflow from moving away and ensuring adequate reactant supply to all components, thereby enhancing fuel cell operational life and efficiency.
Implementation Method 1
The different portions of the baffle establish different fluid supply regions... The first portion and the second portion establish fluid supply regions that prevent fluid from moving away from the manifold surface toward the fuel cell
Data Source
Figure 1~3
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AI summary
According to an embodiment, an assembly for use in a fuel cell includes a manifold having at least one inlet and at least one surface configured to facilitate fluid flow from the inlet along a direction in the manifold. A baffle is situated generally parallel to the direction of flow. The baffle has a first portion, a second portion and a third portion. The first portion is closer to the inlet than the second portion. The second portion is closer to the inlet than the third portion. The first portion has a first width situated generally perpendicular to the flow direction. The second portion has a second width situated generally perpendicular to the flow direction. The second width is less than the first width. The third portion has a third width situated generally perpendicular to the flow direction. The third width is greater than the second width.