Microfluidic Array Electrode Geometry for Pumping Efficiency
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Solution Overview
Problem
Current electrohydrodynamic (EHD) pumps for cooling electronic devices, such as satellites and power electronics, face limitations in pumping efficiency and space efficiency, requiring improved fluid flow control and compact thermal management systems.
Innovation Solution
An array of flow units with a grid structure electrode and a collector electrode, where the electrodes are offset to enhance fluid flow directionality, and the use of a voltage source to control fluid flow, allowing for increased pumping efficiency and compact design by arranging flow units in a lateral plane, enabling re-circulation and efficient fluid communication between units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional EHD pumps are used for cooling electronic devices, then cooling function is provided, but the pump size and weight are large, reducing space efficiency
Solution Approach 1:
The pump is divided into multiple flow units arranged in an array, where each flow unit contains a grid structure electrode with bridges and joints. This segmentation allows the pump to achieve compact size while maintaining pumping efficiency through the collective action of multiple flow units
Solution Approach 2:
The flow units are arranged in a lateral plane configuration rather than a linear or stacked arrangement. This two-dimensional array layout reduces the overall pump volume while maintaining effective pumping capacity through parallel fluid flow paths
2Temperature
If traditional EHD pumps are used, then fluid transport is achieved, but the surface-to-volume ratio is low, reducing heat dissipation efficiency
Solution Approach 1:
The lateral plane arrangement of flow units creates a flattened pump geometry with extended surface area in the lateral dimensions while maintaining compact volume. This increases the surface-to-volume ratio, enabling more effective heat dissipation from the pump structure and electronic components
3Volume of moving object
If electrodes are placed close together to reduce pump size, then compact design is achieved, but fluid flow directionality and control are reduced
Solution Approach 1:
The grid structure electrode features bridges with specific height-to-gauge ratios (height > gauge, preferably at least twice) that create localized flow control characteristics. This local geometric optimization maintains fluid flow directionality and control effectiveness within the compact pump volume
Solution Approach 2:
The offset positioning of the second electrode relative to the first electrode in the downstream direction pre-establishes favorable fluid flow paths and pressure gradients. This preliminary geometric arrangement ensures effective flow control is maintained even with reduced electrode spacing in the compact design
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 solution enhances pumping efficiency, reduces the size and weight of the pump, and increases the surface-to-volume ratio, facilitating better heat dissipation and cooling efficiency in compact electronic devices.
Implementation Method 1
an array of flow units, wherein the flow units are arranged to have a lateral extension in a common lateral plane. Each flow unit is adapted to control a respective flow of a fluid... Each flow unit comprises a first electrode and a second electrode... applying an electric potential difference between the first electrode and the second electrode
Implementation Method 2
The first electrode comprises bridges and joints forming a grid structure, which is arranged to allow the fluid to flow there through
Data Source
AI summary
An array of flow units for controlling a flow of a fluid is disclosed. The flow units are arranged to have a lateral extension in a common lateral plane. A downstream side of a first flow unit is in fluid communication with an upstream side of a second flow unit to allow a flow of fluid to pass through the flow units. The flow units comprise first and second electrodes which are connectable to a voltage source. At least a portion of the first electrode has a maximum height in a direction parallel to the direction of the flow and a maximum gauge in a direction orthogonal to the direction of the flow, wherein the maximum height is larger than the maximum gauge to improve the pumping efficiency of the device. A method for controlling a fluid flow using the array is also disclosed.