EHD Fluid Cooling for Compact Electronic Enclosures
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Solution Overview
Problem
Existing thermal management techniques for small-scale heat generating components are inefficient and bulky, particularly due to the use of nozzles and pumps, which are expensive and not suitable for compact designs.
Innovation Solution
An electrohydrodynamic (EHD) flow unit with electrodes is used to control the flow of a thermal management fluid within an enclosure, directing it towards or away from the heat generating component without the need for nozzles, utilizing dielectric liquids and gases like acetone, alcohols, helium, and fluorocarbon-based fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If immersion cooling with pump unit and nozzles is used, then thermal management efficiency is improved, but device complexity and bulkiness increase
Solution Approach 1:
The patent extracts and eliminates the pump unit and nozzle components from the immersion cooling system. Instead of using mechanical pumping and directional nozzles, the invention applies electrohydrodynamic forces directly to the dielectric fluid to achieve circulation and targeted cooling, thereby simplifying the system architecture while maintaining cooling efficiency.
Solution Approach 2:
The patent replaces the mechanical pump unit with an electrohydrodynamic system. By applying high voltage between electrodes, the system generates electrostatic forces that drive fluid circulation without mechanical moving parts, thus reducing device complexity and bulkiness while achieving effective thermal management.
2Ease of operation
If immersion cooling with nozzles is used, then fluid flow direction is controlled, but manufacturing cost and device size increase
Solution Approach 1:
The patent removes the expensive nozzle components from the system. Fluid flow direction is controlled not by physical nozzles but by positioning electrodes strategically, allowing the dielectric fluid to be directed toward heat-generating components through electrohydrodynamic forces, thereby reducing manufacturing costs and simplifying production.
Solution Approach 2:
The patent substitutes mechanical nozzles with an electrostatic field-based control mechanism. By applying voltage to electrodes positioned near heat-generating components, the system directs fluid flow through electrohydrodynamic attraction, achieving precise flow control without expensive mechanical nozzle assemblies.
3Productivity
If smaller components with higher power dissipation are used, then system performance is improved, but heat generation in smaller areas increases
Solution Approach 1:
The patent implements localized cooling by positioning electrodes in close proximity to specific heat-generating components. The electrohydrodynamic system creates localized fluid circulation patterns that concentrate cooling effects precisely where heat is generated, enabling effective thermal management of high-power-density components without requiring system-wide cooling infrastructure.
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 approach enables precise control of fluid flow for efficient cooling, allowing targeted cooling of specific areas and reducing bulkiness, while maintaining compactness and efficiency.
Implementation Method 1
The first flow unit may be activated by applying a voltage difference between the first and second electrodes of the flow unit. The electric field generated by the electrodes may bring the fluid to a flow.
Implementation Method 2
During use, the emitter may be adapted to emit electrons into the fluid and/or to negatively charge matter, such as particles or impurities of the fluid, in a close proximity of the emitter.
Data Source
AI summary
An arrangement for thermal management is disclosed, wherein a heat generating component is arranged within an enclosure, defined by an enclosure wall and in thermal contact with a thermal management fluid. The arrangement comprises an electrohydrodynamic flow unit, comprising a first and a second electrode, for controlling the flow of fluid within the enclosure.