Curved Diode Heat Pipe for Unidirectional Thermal Rectification
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Solution Overview
Problem
Existing heat management systems for devices like electronic components, engine, and fuel cell stacks face challenges in efficiently managing unidirectional heat flow, as they often require either heat expulsion or absorption, which existing technologies fail to address effectively.
Innovation Solution
A heat pipe heat flux rectifier with a curved diode design, incorporating an adiabatic section, evaporator, condenser, and non-condensable gas reservoir, operates as a thermal conductor when heat is applied to the evaporator and as a thermal insulator when heat is applied to the condenser, utilizing a wicking material and non-condensable gas to control heat flow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a heat pipe is designed to conduct heat in one direction, then thermal conductivity in the forward direction is improved, but thermal insulation in the reverse direction deteriorates
Solution Approach 1:
The heat pipe employs asymmetric structural design including a curved adiabatic section and strategically positioned non-condensable gas reservoir that creates different thermal resistance characteristics for forward and reverse heat flow directions, enabling high thermal conductivity in the forward direction while maintaining thermal insulation in the reverse direction
Solution Approach 2:
A non-condensable gas reservoir is introduced as an intermediary element within the heat pipe system. This gas reservoir acts as a selective mediator that allows efficient heat transfer in the forward direction through vapor condensation while creating thermal resistance in the reverse direction by blocking vapor flow, thus resolving the contradiction between forward thermal conductivity and reverse thermal insulation
2Adaptability or versatility
If a curved adiabatic section is added to the heat pipe, then unidirectional heat flux control is improved, but device complexity increases
Solution Approach 1:
The heat pipe incorporates a curved adiabatic section instead of a straight configuration. This curvature is strategically designed to optimize the thermal path and enhance the unidirectional heat flux control capability by creating natural thermal gradients and flow patterns that favor forward heat transfer while resisting reverse heat transfer, achieving improved adaptability without proportionally increasing complexity
3Reliability
If a non-condensable gas reservoir is added to control heat flow direction, then thermal rectification performance is improved, but manufacturing complexity increases
Solution Approach 1:
The heat pipe is segmented into distinct functional sections: evaporator section, curved adiabatic section, condenser section, and non-condensable gas reservoir. This segmentation allows each component to be optimized and manufactured separately with specific functions, making the overall complex system more manageable in terms of manufacturing and assembly by treating it as a collection of simpler modular components
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 heat pipe heat flux rectifier enables efficient unidirectional heat transfer, allowing devices to operate optimally by dissipating or absorbing heat as needed, with a thin profile and controlled boiling point, enhancing thermal conductivity and insulation properties.
Implementation Method 1
a wicking material... The wicking material may include a substantially uniform wick, while other embodiments may utilize different wicking materials or structures for each section. Regardless, the wicking material may include a porous media
Implementation Method 2
the first curved diode heat pipe stores a fluid... operates as a thermal conductor when heat is applied to the evaporator section
Implementation Method 3
an evaporator section that is coupled to the adiabatic section... operates as a thermal conductor when heat is applied to the evaporator section
Implementation Method 4
a condenser section that is coupled to the adiabatic section... operates as a thermal conductor when heat is applied to the evaporator section
Implementation Method 5
a non-condensable gas reservoir that is coupled to the condenser section for storing non-condensable gas... operates as a thermal insulator when heat is applied to the condenser section
Data Source
AI summary
Embodiments for a heat pipe heat flux rectifier are provided. One embodiment includes a first curved diode heat pipe that includes an adiabatic section that includes a curved portion, an evaporator section that is coupled to the adiabatic section, and a condenser section that is coupled to the adiabatic section. In some embodiments, the first curved diode heat pipe includes a non-condensable gas reservoir that is coupled to the condenser section for storing non-condensable gas, where the first curved diode heat pipe stores a fluid and a wicking material. In some embodiments, the first curved diode heat pipe operates as a thermal conductor when heat is applied to the evaporator section and as a thermal insulator when heat is applied to the condenser section.