Capillary Structure for Directional Fluid Transport Against Pressure
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Solution Overview
Problem
Existing fluid handling structures face inefficiencies due to random fiber orientation in porous materials, requiring large masses of materials for fluid transport and struggling with backflow and external pressure, such as gravity, which previous technologies have not adequately addressed.
Innovation Solution
A capillary structure with varying depth and width profiles, including diverging, connective, and transition sections, designed for passive directional fluid transport, where the depth in the transition section is less than in the diverging sections, allowing for efficient fluid flow against gravity and reducing backflow by creating a concave-convex meniscus transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random orientation of fibers in porous structures is used, then fluid transport capacity is reduced, but large masses of materials are required to move fluid volumes
Solution Approach 1:
The invention utilizes a porous substrate with integrated capillary channels that combine the benefits of porous material absorption with directed fluid transport pathways. The capillary channels are formed within the porous structure, allowing fluid to be absorbed and transported efficiently without requiring large masses of random fiber materials.
Solution Approach 2:
The capillary channel is divided into multiple sections (first capillary section, second capillary section, transition section) with different geometric properties. Each section is optimized for specific functions: the first section for forward flow, the second for preventing backflow, and the transition section for directional control, thereby improving fluid transport capacity with reduced material requirements.
2Reliability
If conventional capillary structures are used, then backflow cannot be eliminated, but fluid transport against gravity or external pressure is limited
Solution Approach 1:
The capillary channel exhibits asymmetric geometry with different cross-sectional areas in the first and second capillary sections relative to the transition section. This asymmetry creates different capillary pressure requirements for forward and backward flow, enabling unidirectional transport while resisting backflow and external pressure effects.
Solution Approach 2:
The invention changes geometric parameters (cross-sectional area, channel depth, width) along the capillary channel length. The transition section has reduced depth compared to the diverging sections, creating a geometric barrier that prevents backflow while allowing forward transport against gravity and external pressure.
3Productivity
If equal depth capillary channels are used, then manufacturing is simplified, but directional transport perpendicular to surface is not achieved
Solution Approach 1:
Different sections of the capillary channel have different local geometric qualities. The first and second capillary sections have greater depth for effective fluid transport, while the transition section has reduced depth to create the directional barrier. This local variation in depth optimizes directional transport efficiency while maintaining manufacturability.
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 design enhances fluid handling efficacy by increasing volumetric flow rates, reducing friction, and allowing directional flow control, even against external pressures, while being tolerant of variations in capillary dimensions and wetting properties, thus improving the robustness and efficiency of fluid transport.
Implementation Method 1
A capillary structure with varying depth and width profiles, including diverging, connective, and transition sections, designed for passive directional fluid transport
Implementation Method 2
creating a concave-convex meniscus transition
Data Source
AI summary
A capillary structure for passive, directional fluid transport, includes a capillary having a forward direction and a backward direction extending in an x-y plane and a depth extending in a z-direction, the capillary including first and second capillary units each having a diverging section having a backward end, a forward end, and a width in the y-direction, wherein the width increases from the backward end to the forward end, wherein the backward end of the second capillary unit diverging section is connected to the forward end of the first capillary unit diverging section to form a transition section having a step decrease in width from the forward end of the first capillary unit diverging section to the backward end of the second capillary unit diverging section, and wherein the depth in the transition section is less than the depth in each diverging section.