Multiplex Helical Inertial Filter for Low-Pressure-Drop Separation
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Solution Overview
Problem
Existing life support systems for spacecraft face challenges in efficiently collecting liquid droplets and solid particles from gas streams due to the low-gravity environment, with active separators and fine filters exhibiting issues such as complexity, pressure drop, and increased mass, power consumption, and noise.
Innovation Solution
A filter utilizing a deflected pathway with helical conduit geometry within a porous material that passively separates liquid and solid particles using inertial, capillary, and wetting forces, allowing for passive liquid droplet and particle collection with low pressure drop and no moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active separators are used to separate liquid droplets and solid particles from gas streams, then separation effectiveness is improved, but device complexity increases and reliability decreases
Solution Approach 1:
The patent extracts and eliminates moving parts from the separation system by using a static porous media filter with helical conduits. The separation function is achieved through passive inertial forces and capillary wicking action rather than active mechanical components, thereby improving reliability while maintaining separation effectiveness.
Solution Approach 2:
The system uses self-service principles by allowing the porous media to automatically wick and transport collected liquid droplets and particles through capillary forces without requiring external power or control systems. The helical conduit geometry passively generates centrifugal forces during gas flow to enhance separation, making the system self-regulating and more reliable.
2Measurement precision
If fine filters are used to collect liquid droplets and solid particles, then separation precision is improved, but pressure drop increases significantly
Solution Approach 1:
The patent employs helical (curved) conduit geometry within the porous media to generate passive centrifugal forces that enhance particle and droplet separation. The curved pathways cause inertial impaction of particles onto the filter media surfaces, improving collection precision without requiring the extremely fine, high-pressure-drop structures of conventional filters.
Solution Approach 2:
The system changes the operational parameters by using larger pore dimensions in the helical conduit regions compared to traditional fine filters. This allows gas flow to maintain lower pressure drop while still achieving effective separation through the combination of inertial forces in the helical paths and capillary wicking in the porous media.
3Reliability
If conventional filters are used in low-gravity environments, then filtration function is maintained, but system mass and power consumption increase
Solution Approach 1:
The patent replaces mechanical separation mechanisms (such as active separators with moving parts) with passive physical forces - specifically inertial forces generated by helical flow paths and capillary wicking forces in porous media. This substitution eliminates the need for heavy mechanical components and power consumption, reducing system mass while maintaining reliable filtration function in low-gravity environments.
4Productivity
If active separation systems are implemented, then separation performance is improved, but power consumption and noise increase
Solution Approach 1:
The system achieves separation performance through self-service mechanisms where the flowing gas itself generates the necessary centrifugal forces via helical conduit geometry, and the collected liquid is automatically transported by capillary wicking action. No external power is required to drive separation or liquid removal, maintaining high productivity while eliminating power consumption and noise associated with active systems.
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 filter effectively separates gas and liquid streams with low pressure drop and no additional power consumption, enhancing reliability and suitability for low-gravity environments by using centrifugal forces to collect droplets in the porous media.
Implementation Method 1
particles/droplets are driven to conduit surfaces where they adhere and are wicked inward and thus collected in the porous media. The capillary wicking force leads to the uniform passive migration of the fluid throughout the media
Implementation Method 2
a filter described herein employs a deflected pathway, such as a helical conduit geometry within a porous material, that exploits passively induced centrifugal (inertial) forces on particle/liquid laden airflows. For example, particles/droplets are driven to conduit surfaces where they adhere
Implementation Method 3
The conduit pore dimension is expected to be larger than the media pore dimension. Thus, the variable porosity component (droplet phase separating media) exploits inertial, capillary, and wetting forces to quickly separate gas/vapor-driven droplet streams
Data Source
AI summary
Methods and systems are provided for a multiplexed phase separating inertial filter that is composed of helical through holes generating centrifugal separating forces. In one example, the inertial filter may be a planar porous material with an array of helical channels, each helical channel of the array of helical channels extending from a top surface of the porous material to a bottom surface of the porous material.