Topology-Optimized Fluid Diode for High Diodicity
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Solution Overview
Problem
Existing fluid diodes with flat-walled structures cannot completely stop reverse flow and require specific alignment of inlet and outlet ports, limiting their diodicity and versatility in applications.
Innovation Solution
A fluid flow device with an optimized network of channels, aligned inlet and outlet, and determined channel positions using topology optimization methods to achieve improved diodicity, featuring a Reynolds number between 100 and 300, a decreasing Darcy number, and specific aspect ratios to enhance unidirectional flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed-geometry fluid diode with flat-walled structures is used, then the device is easy to fabricate and robust, but it cannot completely stop reverse flow and has limited diodicity
Solution Approach 1:
The fluid diode is segmented into multiple channels with different geometries (straight channel, arc channel, and diffuser channel) that work together to achieve superior reverse flow blocking while maintaining forward flow efficiency. Each channel serves a specific function in the overall diodic mechanism.
Solution Approach 2:
The device employs asymmetric channel configurations where the arc channel and diffuser channel create different flow resistance characteristics for forward and reverse flows. The asymmetric geometry enables the device to distinguish between flow directions and achieve high diodicity.
2Reliability
If the inlet and outlet ports are specifically positioned and oriented as in the original Tesla valve, then the device achieves flow rectification, but the alignment requirements limit versatility and ease of installation
Solution Approach 1:
The fluid diode design incorporates multiple channel types (straight, arc, and diffuser channels) that enable the device to maintain high diodicity performance across different port orientations and configurations. This multi-functional channel system allows the same device structure to adapt to various installation requirements while preserving flow rectification capability.
Solution Approach 2:
The device introduces a diffuser channel that expands in the flow direction, adding a dimensional element that helps accommodate different port orientations. The diffuser geometry provides flow adaptation in multiple directions, reducing the strict alignment requirements of traditional Tesla valves.
3Reliability
If the network of fluid channels is configured with optimized shapes and connectivity, then diodicity is significantly improved, but the device complexity increases
Solution Approach 1:
Different regions of the device employ different channel geometries optimized for their specific functions: straight channels for low-resistance forward flow, arc channels for flow direction control, and diffuser channels for reverse flow blocking. Each local region has tailored properties that contribute to overall diodicity without requiring complex global restructuring.
Solution Approach 2:
The device merges multiple channel functions into a single integrated structure where straight, arc, and diffuser channels work together in parallel and series configurations. This consolidation achieves high diodicity while avoiding the need for multiple separate components or overly complex individual channels.
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 optimized fluid diode design significantly improves diodicity by maximizing power dissipation in forward flow while minimizing reverse flow, allowing for efficient unidirectional fluid flow and robustness in various applications.
Implementation Method 1
A Tesla valve is composed of a straight and an embowed channel, and it utilizes inertial effect to drive part of reverse flow to the embowed channel thus dissipates its energy.
Implementation Method 2
A diffuser is a flow channel with expanding cross-section, and no doubt that flow in this direction requires smaller driving pressure.
Data Source
AI summary
The present invention is directed to an improved fluid diode using topology optimization with Finite Element Method (FEM). Topology optimization as a flexible optimization method has been extended to the fluid field. For given boundary conditions and constraints, it distributes a specific amount of pores (or remove materials to get channel) in the design domain to minimize/maximize an objective function. In this design, inlet and outlet ports are aligned and inflow and outflow are in the same direction. The present invention features an intricate network of fluid channels having optimized fluid connectivity and shapes, which significantly improves the diodicity of fluidic passive valves.