Multi-Layer Filter Media Wettability Optimization
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Solution Overview
Problem
Existing surface modified filter media do not adequately enhance fluid separation efficiency, particularly in applications like fuel-water separation, due to limitations in air permeability, fiber diameter distribution, and hydrophobicity/hydrophilicity, which restricts their performance in removing contaminants effectively.
Innovation Solution
A non-woven filter media with multiple layers, where at least one layer is surface modified to alter wettability and air permeability, allowing for enhanced fluid separation by incorporating hydrophobic and hydrophilic surfaces with varying air permeability and mean flow pore sizes, enabling improved coalescence and shedding of fluid droplets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer filter media is used, then the structure is simple, but the fluid separation efficiency is insufficient
Solution Approach 1:
The filter media is divided into multiple layers, each with specific thickness, porosity, and surface modification characteristics. The first layer has a first porosity and the second layer has a second porosity different from the first, allowing each layer to perform specific separation functions that collectively achieve high fluid separation efficiency while maintaining a manageable multi-layer structure.
2Reliability
If uniform porosity is used throughout the media, then the manufacturing is simple, but the coalescence and shedding performance is limited
Solution Approach 1:
Different regions of the filter media have different porosity values. The first layer has a first porosity optimized for initial separation, while the second layer has a second porosity optimized for coalescence and shedding. This local variation in porosity throughout the media enables enhanced coalescence and shedding performance while maintaining manufacturability through controlled fabrication parameters.
3Reliability
If all layers have the same air permeability, then the manufacturing is easier, but the fluid separation efficiency is reduced
Solution Approach 1:
The porosity parameter is varied between layers to optimize fluid separation efficiency. The first layer has a first porosity and the second layer has a second porosity different from the first, creating different air permeability characteristics in each layer. This parameter variation enhances separation performance while the porosity values are controlled within achievable ranges to maintain reasonable manufacturability.
4Reliability
If the media thickness is increased, then the separation capacity is improved, but the air permeability decreases
Solution Approach 1:
Rather than using a single thick layer, the media is segmented into multiple thinner layers with different porosity values. This segmentation allows the total thickness to provide adequate separation capacity while the varying porosity across layers maintains better air permeability compared to a uniform thick layer, as each layer can be optimized for its specific function.
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 multi-layer filter media achieves significantly improved fluid separation efficiency, with enhanced coalescence and shedding capabilities, effectively addressing the limitations of existing technologies by optimizing surface modifications and layer configurations.
Implementation Method 1
a first layer having a hydrophobic surface... a third layer, where a surface of the third layer is coated with a hydrophilic material
Implementation Method 2
The fiber web provides a porous structure that permits fluid (e.g., gas, liquid) to flow through the media. Contaminant particles (e.g., dust particles, soot particles) contained within the fluid may be trapped on or in the fiber web.
Implementation Method 3
a third layer, where a surface of the third layer is coated with a hydrophilic material
Data Source
AI summary
Surface modified filter media, including surface modified filter media having enhanced performance characteristics, are provided. In some embodiments, a filter media may comprise two or more layers designed to enhance fluid separation efficiency. One or more of the layers may have at least a portion of a surface that is modified to alter and/or enhance the wettability of the surface with respect to a particular fluid. In certain embodiments involving a filter media including more than one surface modified layer, at least one surface modified layer may have a greater air permeability and/or mean flow pore size than that of another surface modified layer. Such a configuration of layers may result in the media having enhanced fluid separation properties compared to filter media that do not include such modified layers or configuration of layers, all other factors being equal. The filter media may be well-suited for a variety of applications, including filtering fuel, air, and lube oil.