Loop Thermosiphon Vapor-Liquid Routing to Prevent Dry Out
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Solution Overview
Problem
Existing loop thermosiphons face challenges in enhancing thermal performance by preventing dry out and flooding while increasing heat transfer rates, particularly under high heat flux conditions.
Innovation Solution
A loop thermosiphon assembly with a thermal interface component, vapor channels, and coolant pipes configured to direct vaporized coolant upwards and liquefied coolant downwards, incorporating features like porous linings, capillary wicking layers, and solid barriers to manage coolant flow and prevent backflow, thereby enhancing evaporation and condensation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the filling ratio and coolant flow rate are raised to enhance efficiency, then heat transfer rate is improved, but dry out and flooding risks increase
Solution Approach 1:
The patent divides the evaporator into multiple segments with separate vapor channels and coolant pipes. Each segment has its own vapor barrier and capillary wicking layer, allowing independent control of coolant distribution. This segmentation prevents localized dry out while maintaining high overall heat transfer rates by ensuring uniform coolant flow across all evaporator regions.
Solution Approach 2:
The patent implements location-specific structures including vapor barriers positioned at critical vapor-liquid interfaces, capillary wicking layers at the evaporator bottom for localized coolant replenishment, and strategically placed porous linings. These local quality enhancements ensure that high heat flux regions receive adequate coolant while preventing flooding in other areas, resolving the contradiction between high heat transfer and reliability.
2Productivity
If vapor channels and coolant pipes are configured to direct flow efficiently, then thermal performance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into integrated components. The vapor barrier serves both as a flow direction controller and a structural support element. The capillary wicking layer simultaneously acts as a coolant distribution mechanism and a vapor seal. The porous lining combines vapor channel formation with structural reinforcement. This merging reduces the number of separate components needed, thereby reducing device complexity while maintaining improved thermal performance.
Solution Approach 2:
Key components perform multiple functions: the vapor barrier not only directs vapor flow but also supports the evaporator structure and prevents liquid backup; the coolant pipes serve both as cooling channels and as structural elements defining the evaporator geometry. This multi-functionality reduces the overall component count and simplifies the device structure while achieving efficient thermal management.
3Reliability
If porous linings and capillary wicking layers are added to manage coolant flow, then prevention of dry out is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs porous linings and capillary wicking layers made from materials with controlled pore structures that can be manufactured using established techniques such as sintering, foaming, or fabricating with specific mesh structures. These porous materials are integrated directly into the evaporator manufacturing process rather than being added as separate components, which simplifies assembly and reduces overall manufacturing complexity while effectively preventing dry out through capillary-driven coolant distribution.
4Ease of operation
If vapor barriers and solid barriers are implemented to prevent backflow, then coolant flow control is improved, but device complexity increases
Solution Approach 1:
The vapor barriers and solid barriers are designed to automatically regulate coolant flow and vapor movement based on local pressure and temperature conditions without requiring external control systems. The barriers self-adjust to prevent backflow when needed while allowing free flow under normal operating conditions, providing intelligent flow control that simplifies system operation without adding complex control mechanisms.
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 assembly achieves higher heat transfer rates and improved thermal efficiency by preventing dry out and flooding, optimizing coolant flow and heat dissipation in high-performance processors and electronic components.
Implementation Method 1
a liquid coolant undergoes phase changes (vaporization and condensation) and the system has self-sustaining motion driven by pressure differences between hot and cold regions and gravity
Implementation Method 2
Heat is absorbed from a heat source by the evaporator causing liquid coolant within the evaporator to vaporize
Implementation Method 3
The condenser is where the vaporized liquid coolant releases heat, typically to a heat sink or other cooling mechanism(s). As the vapor cools in the condenser, it condenses back into a liquid state
Implementation Method 4
self-sustaining motion driven by pressure differences between hot and cold regions and gravity
Implementation Method 5
incorporating features like porous linings, capillary wicking layers
Data Source
AI summary
A loop thermosiphon assembly may include a thermal interface component configured to be coupled to a heat source to be cooled, a channel coupled to the thermal interface component, a first vapor channel coupled to the channel, and one or more coolant pipes coupled to the first vapor channel and the channel. The channel includes a vapor barrier and a second vapor channel. The first vapor channel is in communication with the thermal interface component via the second vapor channel. The one or more coolant pipes is in communication with the thermal interface component via the vapor barrier. The second vapor channel and the first vapor channel direct vaporized liquid coolant upwards and away from the thermal interface component and heat source, and the one or more coolant pipes and the vapor barrier direct liquefied vapor coolant downwards and toward the thermal interface component and the heat source.