Composite Structure for Boundary Layer Viscosity Control
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Solution Overview
Problem
Flexible surface materials experience reduced service life due to internal heat buildup from pressure or resistance of a liquid medium, which can also increase the temperature of the fluid medium's boundary layer, reducing its viscosity and viscous resistance.
Innovation Solution
A composite structure is formed by inlaying a flexible surface layer with a non-heat-conduction rigid substrate and incorporating thermal conduction materials like graphene, silver powder, or AlN to enhance heat transfer, allowing for controlled temperature management and reduced viscosity of the fluid medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the flexible surface layer is deformed under liquid medium pressure, then the temperature of the boundary layer increases, but the service life of the flexible surface layer material decreases due to heat buildup
Solution Approach 1:
The patent applies local quality by creating a non-uniform thermal conductivity distribution within the flexible surface layer. Thermal conduction materials (graphene, aluminum powder, silver powder, or AlN) are added to specific regions or throughout the material to create zones of enhanced heat transfer capability. This allows the surface layer to locally manage heat differently, transferring it to the boundary layer where it can be dissipated, while preventing heat buildup in the flexible material itself.
Solution Approach 2:
The patent employs composite materials by combining the flexible surface layer material with thermal conduction materials such as graphene, aluminum powder, silver powder, or AlN. This creates a composite structure where the flexible matrix maintains the necessary flexibility and deformation capability, while the thermal conduction materials provide enhanced heat transfer pathways. The composite structure enables simultaneous achievement of flexibility and improved thermal management.
2Loss of energy
If thermal conduction material is added to the flexible surface layer, then heat transfer efficiency improves, but the material composition complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the thermal conductivity parameter of the flexible surface layer through the addition of thermal conduction materials. By adjusting the type, concentration, and distribution of materials such as graphene, aluminum powder, silver powder, or AlN, the thermal conductivity can be optimized to achieve effective heat transfer while maintaining material flexibility and simplicity of composition.
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 composite structure effectively reduces the kinematic viscosity of the fluid medium's boundary layer, thereby decreasing its viscous resistance by efficiently transferring heat generated from the interaction with the liquid medium.
Implementation Method 1
A thermal conduction material is added in to the flexible surface layer material. The thermal conduction material is graphene, silver powder or AIN, a heat conduction net chain is formed in the flexible surface layer material, so that the heat produced by the work which is applied by the liquid medium to a coupled structure can be maximally transferred out
Data Source
Figure 1~2
AI summary
The invention discloses a composite structure capable of changing the viscosity of a liquid medium. The composite structure is formed by inlaying a flexible surface layer into a rigid substrate. According to the composite structure, the flexible surface layer is combined with the rigid substrate in an inlaying manner to couple a non-smooth structure of the rigid substrate with the flexible surface layer, so that the maximum deformation capacity of the flexible surface layer is obtained, and the temperature can rise by 2-3 °C. By adding high-performance heat conduction nanometer materials, such as graphene, aluminum powder, silver powder or the like in a flexible surface layer material, a heat conduction net chain is formed in the flexible surface layer material, so that the heat produced by the work which is applied by the liquid medium to a coupled structure can be maximally transferred out, and the aging of the flexible surface layer material can be effectively prevented, and the control to the temperature of a boundary layer of the liquid medium is realized. Therefore, the kinematic (dynamic) viscosity of the fluid medium of the boundary layer is reduced, and then the viscous resistance of the liquid medium is reduced.