Multilayer Phononic Crystal Structure for Thickness-Direction Heat Control
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Solution Overview
Problem
Conventional monolayer phononic crystal structures are limited in controlling heat flow in the thickness direction due to their thinness, which restricts the application of phononic crystal structures in devices requiring reduced thermal conductivity.
Innovation Solution
A multilayer body comprising two phononic crystal layers with distinct through hole arrangements, where the through directions of the holes in each layer are substantially parallel, allowing for enhanced control of heat flow in both in-plane and thickness directions by creating a phononic band gap that reduces thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a monolayer phononic crystal structure is used, then the structure is simple to manufacture, but the control of heat flow in the thickness direction is limited due to thinness
Solution Approach 1:
The patent transitions from a two-dimensional monolayer phononic crystal structure to a three-dimensional multilayer structure by stacking multiple phononic crystal layers with through holes extending in the thickness direction. This dimensional expansion enables control of heat flow in both in-plane and thickness directions, resolving the limitation of monolayer structures while maintaining manufacturability through repeated layer deposition
2Ease of manufacture
If simple porosification is used to reduce thermal conductivity, then the process is simple, but the thermal conductivity reduction is limited compared to phononic crystal structures
Solution Approach 1:
The patent combines two approaches: the base material is porosified to reduce intrinsic thermal conductivity, and phononic crystal structures with through holes are introduced to create additional thermal resistance pathways. This composite approach achieves superior thermal conductivity reduction compared to either method alone, while the porosification step maintains process simplicity
3Temperature
If multiple phononic crystal layers are stacked to enhance heat flow control, then thermal conductivity is reduced effectively, but the device complexity increases
Solution Approach 1:
The patent divides the phononic crystal structure into multiple discrete layers, each with through holes extending through its thickness. This segmentation allows independent optimization of each layer while achieving cumulative thermal management effects. The modular layer structure reduces overall complexity compared to attempting to create equivalent functionality in a single thick layer
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 structure effectively reduces thermal conductivity and increases electrical resistance, making it suitable for applications where low thermal conductivity and controlled heat flow are necessary, such as in semiconductors and insulators.
Implementation Method 1
a first phononic crystal layer 11 and a second phononic crystal layer 21... the first phononic crystal structure including a plurality of regularly arranged first through holes 12... the second phononic crystal structure including a plurality of regularly arranged second through holes 22... creating a phononic band gap that reduces thermal conductivity
Data Source
AI summary
The present disclosure provides a novel multilayer body. The multilayer body of the present disclosure includes a first phononic crystal layer and a second phononic crystal layer disposed on or above the first phononic crystal layer. The first phononic crystal layer has a first phononic crystal structure including a plurality of regularly arranged first through holes. The second phononic crystal layer has a second phononic crystal structure including a plurality of regularly arranged second through holes. The through direction of the plurality of first through holes in the first phononic crystal layer is substantially parallel to the through direction of the plurality of second through holes in the second phononic crystal layer.