Multilayer Heat Sink Channels to Suppress Boundary Layer Growth
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Solution Overview
Problem
Conventional heat sinks experience reduced heat transfer performance near the outlet due to growth of velocity/thermal boundary layers and vapor bubbles, and increased pressure drops lead to inefficient cooling, potentially causing overheating and damage to electronic components.
Innovation Solution
A multilayer channel heat sink structure with staggered and differently shaped first and second channel parts, along with alternating flow configurations, to enhance stagnation and heat transfer areas, thereby suppressing boundary layer growth and maintaining efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cooling fluid flows through a single channel, then the structure is simple, but the heat transfer performance decreases near the outlet due to boundary layer growth
Solution Approach 1:
The heat sink is divided into multiple channels (first channel, second channel, third channel) with different flow paths. The cooling fluid is segmented to flow through different channels, preventing boundary layer growth in any single channel and maintaining heat transfer performance throughout the heat sink.
Solution Approach 2:
The patent introduces a multi-dimensional channel arrangement where channels extend in different directions (first channel in first direction, second channel in second direction, third channel in third direction). This spatial arrangement increases the stagnation area and prevents boundary layer development by creating three-dimensional flow patterns.
2Area of stationary object
If the flow path is extended to increase heat transfer area, then the cooling coverage is improved, but the pressure drop increases rapidly
Solution Approach 1:
The extended flow path is segmented into multiple channels with different lengths and directions. Each channel provides a portion of the total heat transfer area, distributing the pressure drop across multiple parallel paths rather than one long sequential path, thereby reducing overall pressure drop while maintaining large heat transfer area.
Solution Approach 2:
Channels are arranged in three-dimensional space extending in different directions, allowing the heat transfer area to be expanded volumetrically rather than just planarly. This reduces the required flow path length for achieving a given heat transfer area, thereby reducing pressure drop.
3Productivity
If the channel flow rate is increased to improve cooling, then the heat transfer coefficient increases, but the velocity boundary layer grows and reduces effectiveness near outlet
Solution Approach 1:
The total cooling load is distributed across multiple channels, each handling a portion of the flow. This segmentation allows each channel to maintain effective flow velocity without excessive boundary layer growth, as the flow is divided into manageable segments rather than one high-velocity channel.
Solution Approach 2:
By arranging channels in three dimensions with different orientations, the patent creates multiple stagnation areas where high-velocity jet impingement occurs. This three-dimensional arrangement ensures that increased flow rate benefits are distributed across multiple impingement zones rather than concentrated in a single outlet region, maintaining cooling effectiveness throughout.
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 multilayer channel structure effectively prevents overheating by improving heat transfer performance and critical heat flux, maintaining efficient cooling across the heat sink while minimizing pressure drops.
Implementation Method 1
a main body part which is provided with an inlet through which a cooling fluid is introduced and an outlet through which the cooling fluid is discharged
Implementation Method 2
capable of suppressing the growth of a velocity/thermal boundary layer and vapor bubble layer that occurs along each channel by increasing a stagnation area and heat transfer area of jet impingement
Data Source
AI summary
The present invention relates to a heat sink with a multilayer channel structure, the heat sink includes a main body part which is provided with an inlet through which a cooling fluid is introduced and an outlet through which the cooling fluid is discharged, a first channel part provided inside the main body part and through which the cooling fluid flows, and a second channel part which is provided inside the main body part and through which the cooling fluid flows, wherein the second channel part is disposed to be stacked on the first channel part, the first channel part and the second channel part extend in different directions, and the second channel part communicates with the first channel part.