Eccentric Light Emitting Wheel for Thermal Boundary Layer Dispelling
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Solution Overview
Problem
In laser-light emitting material wheels, such as laser-ceramic phosphor wheels, thermal resistance is hindered by the formation of a thermal boundary layer due to convective heating, which impedes heat dissipation from the wheel to the air.
Innovation Solution
Introducing eccentricity to the light emitting wheel by offsetting its center-of-mass from its center-of-rotation, causing the wheel to vibrate and oscillate, thereby disrupting and dispelling the thermal boundary layer and reducing thermal impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wheel rotates at high speed to improve light output, then productivity increases, but thermal boundary layer formation worsens heat dissipation
Solution Approach 1:
The patent introduces eccentricity into the rotating wheel structure, causing it to vibrate mechanically during rotation. This vibration disrupts the thermal boundary layer that forms around the wheel, preventing the stagnant hot air layer from accumulating and thereby improving heat dissipation while maintaining high rotational speeds for light output
2Stability of the object's composition
If the wheel is designed with perfect symmetry to reduce vibration, then stability improves, but thermal boundary layer dispersal worsens
Solution Approach 1:
The patent deliberately introduces asymmetry through an eccentric design element (such as an off-center weight or non-circular feature) in the wheel structure. This controlled asymmetry creates the necessary vibration to disrupt thermal boundary layers while the overall rotational motion maintains sufficient stability for operational purposes
Solution Approach 2:
The patent modifies the wheel's physical parameters by introducing eccentricity, which changes the distribution of mass or structural features. This parameter change enables the wheel to generate beneficial vibrations that disperse thermal boundary layers during rotation, resolving the contradiction between stability and thermal management
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 vibration and oscillation of the wheel enhance convective cooling by creating surface turbulence, effectively reducing thermal impedance and improving heat dissipation.
Implementation Method 1
a cooling plate configured to cool the light emitting material
Implementation Method 2
the wheel is provided with an off-center center-of-mass, to deliberately introduce eccentricity to the wheel when rotating. This causes the wheel to one or more of vibrate and oscillate
Implementation Method 3
hot air collects around the wheel due to convective heating of the air by the heated wheel
Implementation Method 4
The vibration and oscillation of the wheel enhance convective cooling by creating surface turbulence
Data Source
AI summary
A light emitting wheel with eccentricity for dispelling a thermal boundary layer a light emitting material is provided, including a device comprising: a light emitting material; a cooling plate configured to cool the light emitting material, the cooling plate comprising a center-of-mass that is different from a center-of-rotation of the cooling plate; and, a hub located at the center-of-rotation of the cooling plate.