Stacked-Plate Filter Lip Design for Boundary Layer Control
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Solution Overview
Problem
Existing stacked-plate filters face challenges in efficiently separating smaller particulates from multiphase fluid streams due to boundary layer effects, which lead to increased pressure drops and instability when plates are spaced closely together, especially when dealing with liquids.
Innovation Solution
The introduction of inward weirs or lips at the edges of the plates to modify the boundary layer displacement, allowing for closer spacing of plates while maintaining fluid flow, by narrowing the inlet gap and enhancing fluid flow downstream, thereby reducing pressure drops and increasing the tolerance for particulate exclusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If plates are spaced closely together to exclude smaller particulates, then filtering precision is improved, but boundary layer effects increase causing higher pressure drops and flow instability
Solution Approach 1:
The patent applies preliminary action by introducing inward weirs or lips at the plate edges before the boundary layer can fully develop. These structural features preemptively modify the flow pattern at the inlet, creating a controlled entry region that prevents excessive boundary layer growth downstream while maintaining close plate spacing for fine particulate exclusion.
Solution Approach 2:
The patent changes the geometric parameters of the plate structure by adding inward weirs or lips that extend into the flow passage. This modifies the effective inlet gap width and alters the boundary layer development characteristics, allowing close spacing to be maintained without the adverse pressure drop effects that would otherwise occur.
2Manufacturing precision
If plates are spaced closely together to improve particulate separation, then filtering precision is improved, but flow stability deteriorates due to boundary layer interference
Solution Approach 1:
The inward weirs or lips perform preliminary action by establishing a modified flow regime at the inlet before boundary layers from opposing plates can interact and cause instability. This preliminary structural modification ensures stable flow development throughout the passage while maintaining the close spacing needed for fine particulate separation.
3Stress or pressure
If inward weirs or lips are added to modify boundary layer, then pressure drop is reduced and flow stability is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by adding inward weirs or lips only at specific locations (the edges or inlet regions of the plates) rather than modifying the entire plate structure. This localized modification achieves the boundary layer control and pressure drop reduction while minimizing the increase in overall device complexity.
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
This configuration enables the effective separation of smaller particulates with reduced pressure drops and increased stability, allowing for higher throughput and longer filter operation without clogging, even in multiphase fluid conditions.
Implementation Method 1
the plates comprise a lip that modifies the boundary layer formed by fluids passing along the plates
Data Source
AI summary
Described is a stacked-plate apparatus having a plurality of plates stacked along an axis and having gaps between adjacent plates, each of which act as flow passageways for flow of fluid from a fluid inlet to a fluid outlet. Pairs of adjacent plates comprise one and optionally two lips, which extend axially into the flow passageway at the fluid inlet, thereby narrowing an inlet gap between the plates at the fluid inlet. The lips enhance the flow of fluid towards the fluid outlet of the flow passageway, for at least a working distance downstream thereof, as compared to a pair of adjacent plates that does not have the lips.