Conduit Design for Equalizing Flow Paths in Cross-Section Transitions
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Solution Overview
Problem
Existing fluid handling systems face challenges with dispersion and resolution losses due to end effects, particularly at transitions between regions of different cross-sectional areas, which limit the efficiency of fluid and sample transport in micro- and macroscale processes.
Innovation Solution
The introduction of a conduit with a predetermined shape having a small portal at one end and a large portal at the other, ensuring that the path length through the conduit is essentially the same from the small portal to anywhere within the large portal, thereby eliminating flow nonuniformities and distortions associated with traditional transitional sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional transitional sections are used to connect regions of different cross-sectional areas, then fluid flow is enabled between locations, but band spreading and dispersion occur due to unequal path lengths
Solution Approach 1:
The patent transitions from traditional two-dimensional planar transitional sections to a three-dimensional conduit structure. The conduit extends perpendicular to the channel axis, creating a vertical pathway that equalizes flow paths from the channel center to both walls. This dimensional change eliminates the unequal path length problem inherent in planar transitions while maintaining connection between regions of different cross-sectional areas.
Solution Approach 2:
The conduit design creates equipotential flow paths by ensuring that all fluid elements traveling from the channel center to either wall through the conduit experience equal path lengths. This is achieved by positioning the conduit such that its entrance and exit points are equidistant from the channel walls, and by designing the conduit internal geometry to provide uniform flow distribution, thereby eliminating dispersion caused by path length differences.
2Manufacturing precision
If channel width is reduced to minimize dispersion from path length differences, then separation resolution improves, but manufacturing difficulty and cost increase
Solution Approach 1:
The patent applies local quality by introducing a specialized three-dimensional conduit structure only at the critical transition zones where cross-sectional area changes occur, while the main channel sections can maintain their standard widths. This localized application of complex geometry eliminates the need to reduce the entire channel width, thereby maintaining separation resolution at transition points without increasing overall manufacturing difficulty.
3Productivity
If conventional inlet and outlet ports are used, then fluid transport between locations is enabled, but end effects cause flow nonuniformities and band broadening
Solution Approach 1:
The conduit acts as an intermediary structure between the channel interior and the inlet/outlet ports. It mediates the transition by providing a controlled pathway that equalizes flow distribution before fluid enters or exits the channel. The conduit's geometry is designed to eliminate end effects by ensuring uniform flow paths, thereby maintaining both transport efficiency and flow uniformity.
Data Source
AI summary
Non-limiting exemplary embodiment(s) of apparatus(es) and method(s) are described for the conveyance of fluid media and entrained materials between two or more locations, each possessing a different cross-sectional area. Equidistant pathways incorporated into uniquely designed conduits enable this transference to occur with minimal band spreading and separation resolution loss due to undesirable flow patterns that arise from end effects. The design enables the conduits to be employed with locations of almost any description including process channels, surfaces, or even open volume of any size and used for almost any purpose. The conduits and/or associated locations may be empty of any contents or filled with gelatinous, porous, granular, or particulated material. The design of non-limiting exemplary embodiment(s) of apparatus(es) and method(s) may be easily adapted or configured as necessary.