Vortex Generators for Heat Sink Cooling Efficiency
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Solution Overview
Problem
Next-generation telecommunications and electro-optical components face increased power dissipation challenges due to enhanced functionality, requiring improved cooling solutions beyond standard aluminum heat sinks and fan airflow, which are limited by noise constraints and inefficiency.
Innovation Solution
The implementation of vortex generators upstream of heat sinks to create unsteady airflow, enhancing heat transfer by reducing thermal resistance without significant pressure drop penalties, utilizing inexpensive and lightweight plastic designs that can be placed in underutilized spaces on circuit packs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If copper heat sinks are used instead of aluminum, then thermal conductivity is improved, but cost increases significantly
Solution Approach 1:
The patent changes the material parameter from copper to aluminum, accepting lower thermal conductivity but achieving significant cost reduction. This is compensated by optimizing the heat sink geometry and adding vortex generators to enhance convective heat transfer, thereby achieving acceptable thermal performance at lower cost.
2Temperature
If fan airflow is increased to improve cooling, then heat dissipation is improved, but noise levels increase beyond allowable limits
Solution Approach 1:
The patent introduces vortex generators that create dynamic, unsteady flow patterns in the cooling air. This dynamic flow structure enhances heat transfer coefficients without requiring increased fan speed, thereby improving cooling efficiency while maintaining acceptable noise levels.
Solution Approach 2:
The patent changes the flow regime parameter from steady laminar flow to unsteady turbulent flow through vortex generation. This parameter change enhances convective heat transfer coefficients, allowing effective cooling at lower fan speeds and thus reducing noise.
3Temperature
If individual heat sinks are placed on each optical transceiver, then cooling effectiveness is improved, but space utilization is reduced due to wasted space between transceivers
Solution Approach 1:
The patent merges multiple individual heat sinks into a single shared heat sink structure that serves multiple optical transceivers. This consolidation eliminates the wasted space between individual heat sinks while maintaining effective cooling through the use of vortex generators that enhance heat transfer across the shared structure.
Solution Approach 2:
The patent creates a universal heat sink structure that performs the cooling function for multiple optical transceivers simultaneously. This multi-functional design optimizes space utilization by eliminating redundant heat sink structures while maintaining adequate cooling performance through vortex-induced flow enhancement.
4Temperature
If vortex generators are added to enhance heat transfer, then thermal resistance is reduced, but device complexity increases
Solution Approach 1:
The patent segments the vortex generation function into discrete, modular vortex generator elements that can be independently positioned and optimized. This segmentation allows for simplified manufacturing and assembly while achieving the desired flow disruption and heat transfer enhancement with minimal increase in overall device complexity.
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 achieves a greater than 10% reduction in thermal resistance of heat sinks, improving cooling efficiency while maintaining low costs and minimal weight, and can be applied to various electronics cooling applications.
Implementation Method 1
a vortex generator disposed within the flow such that a vortex or other perturbation is imparted to the cooling fluid flow
Implementation Method 2
a normally steady airflow is made unsteady by, for example, a vortex generator disposed within the flow
Implementation Method 3
the standard cooling solution for telecommunications equipment (and other heat generating equipment) is to thermally connect metal (e.g., aluminum) heat sinks to heat generating components and to force air through these heat sinks via fans
Data Source
AI summary
Use of vortex generators to improve efficacy of heat sinks used to cool telecommunications, electrical and electro-optical components.