Loop Heat Pipe Segmentation for Backflow Resistance
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Solution Overview
Problem
Traditional heat pipes and loop type heat pipes face challenges in improving heat dissipation performance due to the opposing flow directions of gaseous and liquid working fluids, which can lead to hindered flow and reduced efficiency.
Innovation Solution
A loop type heat dissipation structure that includes a heat pipe with a capillary structure and a communicating pipe, where the gaseous working fluid is divided in the evaporation section to reduce flow rate and backflow resistance, enhancing heat dissipation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gaseous working fluid flows rapidly through the pipeline to improve heat dissipation efficiency, then the heat dissipation efficiency is improved, but the backflow resistance of the liquid working fluid increases due to hindered flow
Solution Approach 1:
The heat pipe is divided into multiple independent flow channels (first flow channel, second flow channel, third flow channel, fourth flow channel) with separate capillary structures. This segmentation allows gaseous and liquid working fluids to flow in separate paths, preventing mutual interference and reducing backflow resistance while maintaining high heat dissipation efficiency through parallel heat transfer paths.
Solution Approach 2:
The capillary structure is extracted and placed exclusively in the liquid working fluid return channel, while the gaseous working fluid flows through a separate pipeline without capillary structures. This separation ensures that the capillary force only assists liquid flow without being hindered by gaseous fluid, reducing backflow resistance while maintaining efficient heat dissipation.
2Productivity
If a capillary structure is added to assist liquid working fluid return flow, then the heat dissipation performance is improved, but the device complexity increases
Solution Approach 1:
The capillary structure serves multiple functions: it provides the return flow path for liquid working fluid, acts as a structural support element, and enables passive flow control through capillary forces. By integrating these functions into a single component, the design avoids additional complex mechanisms while improving heat dissipation performance.
Solution Approach 2:
The capillary structure utilizes capillary forces to automatically drive the liquid working fluid from the condensation section back to the evaporation section without requiring external power or control mechanisms. This self-service approach improves heat dissipation performance while avoiding additional complexity from active pumping or control systems.
3Productivity
If the gaseous working fluid flow rate is increased to improve heat dissipation efficiency, then the heat dissipation efficiency is improved, but the exothermic condensation effect is affected
Solution Approach 1:
The condensation section is divided into multiple independent condensation channels (first condensation channel, second condensation channel, third condensation channel, fourth condensation channel), each handling a portion of the gaseous working fluid. This segmentation distributes the condensation load, allowing efficient heat dissipation while maintaining effective condensation in each channel by preventing excessive flow velocity in any single channel.
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 proposed structure improves heat dissipation performance by reducing backflow resistance and enhancing heat release and condensation in the condensation section, leading to more effective heat management.
Implementation Method 1
the liquid working fluid is pushed by the gaseous working fluid to flow from the condensation section to the evaporation section along a closed circuit... the capillary structure is distributed on an inner wall surface of the pipeline and extends from the first condensation section to the first evaporation section
Implementation Method 2
The working fluid absorbs heat in the evaporation section to evaporate from a liquid state to a gaseous state and flows along the first direction to the condensation section
Implementation Method 3
the working fluid releases heat in the condensation section to condense from the gaseous state to the liquid state... the working fluid condenses from the gaseous state to the liquid state in the first condensation section
Data Source
AI summary
A loop type heat dissipation structure includes a heat pipe, a communicating pipe, and working fluid. The heat pipe includes a pipeline, a capillary structure, and a first barrier body. The pipeline has a first evaporation section, a first condensation section, an outlet, and an inlet. The outlet is located at an edge of the first evaporation section, and the inlet is located at an edge of the first condensation section. The capillary structure is distributed on an inner wall surface of the pipeline and extends from the first condensation section to the first evaporation section. The first barrier body is disposed in the first condensation section and is connected to the capillary structure. One end of the communicating pipe is communicated with the outlet, and the other end of the communicating pipe is communicated with the inlet. The working fluid flows in the heat pipe and the communicating pipe.