Electrohydrodynamic Flow Unit for Satellite Thermal Management
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Solution Overview
Problem
Current thermal management systems for electronic devices, particularly in space applications like satellites, face challenges in efficiently controlling fluid flow and heat dissipation due to limited space and energy constraints, necessitating improved control over fluid circulation for effective thermal management.
Innovation Solution
A fluidic device with a flow unit comprising a grid structure of electrodes, where the second electrode is offset from the first in the downstream direction, allowing for voltage control to regulate fluid flow, acting as a valve to manage heat flow by either enhancing or reducing circulation within a closed loop system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If forced flow of fluid is used to improve cooling efficiency, then heat dissipation performance is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent replaces mechanical pumping systems with an electrohydrodynamic flow unit that uses electric fields to generate fluid flow. The flow unit comprises electrodes that create ionized regions in the fluid, generating body forces that drive circulation without moving mechanical parts, thereby reducing device complexity while maintaining cooling efficiency
Solution Approach 2:
The patent changes the physical state of the fluid by creating ionized regions through electric fields. By controlling the ionization parameter (electric field strength), the system can modulate fluid flow characteristics and heat transfer efficiency, enabling dynamic thermal management without mechanical complexity
2Temperature
If forced flow of fluid is used to improve cooling efficiency, then heat dissipation performance is improved, but energy consumption increases
Solution Approach 1:
The patent employs periodic or pulsed electric fields rather than continuous application. The flow unit can be activated in cycles matching the thermal load requirements, reducing average energy consumption while maintaining effective cooling when needed. This is particularly valuable in satellite applications where energy resources are limited
Solution Approach 2:
By dynamically adjusting the electric field strength and ionization level, the system optimizes energy efficiency. The flow unit operates at minimum necessary energy levels to achieve required heat dissipation, and can be scaled or modulated based on real-time thermal management needs
3Ease of operation
If grid structure electrode is used to allow fluid flow through, then flow control capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The electrode is divided into a grid structure with multiple segments rather than a single continuous element. This segmentation provides multiple flow paths and control zones, enabling sophisticated flow regulation while allowing manufacturing tolerances in individual grid elements to average out, reducing overall precision requirements
Solution Approach 2:
The grid structure serves multiple functions: it provides electrical conduction, defines flow paths, and acts as a support structure. This multi-functionality reduces the need for additional precision-manufactured components, as the grid performs several roles simultaneously with relaxed tolerance requirements
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 solution enables efficient thermal management by controlling fluid flow to optimize heat transport, reducing or eliminating circulation when necessary to prevent overheating or cooling, thus providing a reliable and space-efficient thermal management system for electronic devices in harsh environments.
Implementation Method 1
One example of such active cooling systems includes electrohydrodynamical (EHD) pumps wherein ionized particles or molecules interact with an electric field and entrain a flow of a thermal management medium
Implementation Method 2
wherein ionized particles or molecules interact with an electric field
Implementation Method 3
The circulating fluid may be utilized for heat transport for heating or cooling purposes. The heat may e.g. be transported away from a heat generating application such as e.g. an electronic circuit or device, and dissipated to the surroundings or transferred to a heat sink
Data Source
AI summary
A fluidic device is disclosed, comprising an enclosed passage that is adapted to convey a circulating fluid. The enclosed passage comprises a flow unit having a first electrode and a second electrode offset from the first electrode in a downstream direction of a flow of the circulating fluid. The first electrode is formed as a grid structure and arranged to allow the circulating fluid to flow through the first electrode. The fluidic device may be used for controlling or regulating the flow of the fluid circulating in the enclosed passage, and thereby act as a valve opening, reducing or even closing the passage.