Anisotropic Heat Dissipation for Aerosol Device Exterior Cooling
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Solution Overview
Problem
Existing aerosol-generating devices suffer from excessive external heating, making them uncomfortable to touch due to inadequate heat dissipation.
Innovation Solution
Incorporating a heat dissipation element made from a material with anisotropic thermal insulation properties, such as graphene, surrounding the heating chamber to dissipate heat predominantly in axial and tangential directions, reducing heat transfer to the device's exterior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating element heats the aerosol-forming substrate to volatilization temperature, then aerosol generation is achieved, but the device exterior becomes too hot to touch
Solution Approach 1:
The patent applies local quality by implementing a heat dissipation element with directionally selective thermal conductivity. The material has high thermal conductivity in axial and tangential directions (parallel to the longitudinal axis) but low conductivity in the radial direction (perpendicular to the axis). This creates localized heat dissipation pathways that channel heat away from the heating chamber along the device length while preventing radial heat transfer to the exterior housing, thus maintaining safe external temperatures while preserving effective heating chamber temperatures.
Solution Approach 2:
The patent employs asymmetry through the use of anisotropic thermal conductivity in the heat dissipation element. The material properties are deliberately asymmetric with respect to direction: thermal conductivity is high along the axial and tangential directions but low in the radial direction. This asymmetric heat dissipation behavior allows heat to be preferentially conducted along the device axis away from the heating chamber while blocking radial heat flow to the outer housing, resolving the contradiction between effective heating and safe external temperature.
2Temperature
If heat is dissipated radially to the surrounding housing, then external cooling is achieved, but hotspots are created on the device exterior
Solution Approach 1:
The heat dissipation element exhibits local quality through its directionally dependent thermal conductivity. By having high conductivity in axial/tangential directions and low conductivity in the radial direction, the material creates localized heat flow pathways that guide heat away from the heating chamber along the device axis rather than allowing radial heat flow to create hotspots on the exterior housing. This maintains user comfort while achieving effective heat management.
Solution Approach 2:
The asymmetric thermal conductivity of the heat dissipation material prevents radial heat flow that would create exterior hotspots. The material's asymmetric property (high conductivity parallel to axis, low conductivity perpendicular to axis) ensures heat is dissipated along the device length rather than radially outward to the housing, thereby maintaining safe and comfortable external surface temperatures for user contact.
3Temperature
If conventional isotropic heat dissipation materials are used, then heat is distributed in all directions, but the device becomes uniformly hot throughout
Solution Approach 1:
The patent applies parameter changes by utilizing materials with anisotropic thermal conductivity parameters. Instead of using conventional isotropic materials that conduct heat equally in all directions (leading to uniform heating throughout the device), the invention employs materials where the thermal conductivity parameter varies with direction. This allows heat to be preferentially conducted in axial and tangential directions while limiting radial conduction, achieving effective heat distribution without creating uniformly hot device regions and avoiding the need for complex active thermal management systems.
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 solution effectively distributes heat evenly throughout the device, preventing hotspots and ensuring the exterior remains safe to touch by dissipating heat into the device's ambient environment.
Implementation Method 1
The heat dissipation element is made from a material that dissipates heat predominantly in one or both of an axial and tangential direction with respect to a longitudinal axis of the heating chamber
Implementation Method 2
The heat dissipation element is made from a material that dissipates heat predominantly in one or both of an axial and tangential direction with respect to a longitudinal axis of the heating chamber. The heat dissipation element is made of graphene. Graphene has the advantage of having anisotropic characteristics concerning its thermal insulation properties.
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
The invention relates toan aerosol-generating device that may comprise a heating chamber and a heat dissipation element. The heat dissipation element may be arranged at least partly surrounding the heating chamber. The heat dissipation element may be made from a material that dissipates heat predominantly in one or both of an axial and tangential direction with respect to a longitudinal axis of the heating chamber.