Immersion Cooling Heat Sink with Mid-Groove Flow Distribution
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Solution Overview
Problem
Existing immersion liquid cooling systems suffer from poor heat dissipation efficiency due to limited fluid mobility and uneven heat exchange across the fin assembly, with the front section being cold and the rear section being hot, primarily due to restricted flow channels and viscosity of dielectric fluid.
Innovation Solution
The immersion liquid cooling heat sink design includes a fin assembly with grooves and liquid inlet ports positioned to allow dielectric liquid to flow directly from the mid-section of the fin assembly to its ends, ensuring uniform heat exchange capacity by pouring dielectric liquid into grooves that communicate between fin modules and outlets, thereby facilitating complete heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the dielectric liquid is forced to pass through the passage by external forces, then the fluidity of the dielectric liquid is improved, but the heat exchange capacity of the dielectric liquid is greatly reduced in the middle of each passage, resulting in significant difference in heat dissipation efficiency between the front section and the rear section of the heat sink
Solution Approach 1:
The heat sink is divided into multiple independent flow channels, each with its own inlet and outlet ports. This segmentation allows the dielectric liquid to be distributed to multiple passages simultaneously, ensuring that each passage receives adequate coolant flow and maintains uniform heat exchange capacity throughout its length, preventing the front-rear heat dissipation efficiency difference.
Solution Approach 2:
Multiple intermediate inlet ports are introduced along the passages to serve as additional liquid supply points. These intermediary ports ensure that the middle sections of the passages receive sufficient dielectric liquid, maintaining heat exchange capacity throughout the entire passage length and eliminating the heat exchange deficit in the middle sections.
2Volume of moving object
If the spacing of the flow channel between adjacent fins is limited, then the structural compactness is maintained, but the dielectric fluid has poor fluidity due to certain viscosity, resulting in reduced overall heat dissipation efficiency
Solution Approach 1:
The system transitions from static, limited natural convection to dynamic forced circulation by introducing pumps and structured flow channels with multiple inlet ports. This dynamic approach actively drives the viscous dielectric fluid through the compact fin spacing, overcoming viscosity-related flow resistance while maintaining the compact heat sink structure.
Solution Approach 2:
The patent employs hydraulic principles by using pumps to force the dielectric liquid through the flow channels and by designing the channel geometry to optimize liquid flow. The multiple inlet ports create a distributed hydraulic system that ensures adequate flow distribution throughout the compact structure, overcoming the viscosity constraints in limited spacing.
3Device complexity
If the liquid inlet port is configured to be corresponsive the inlets of all passages, then the structure is simplified, but the dielectric liquid can only flow from the inlet to the outlet of each passage sequentially, resulting in significant difference in heat dissipation efficiency between the front section and the rear section
Solution Approach 1:
The single inlet port is segmented into multiple inlet ports, each serving specific passages. This segmentation transforms the sequential flow pattern into a parallel flow distribution system, where dielectric liquid can simultaneously supply multiple passages through different inlet ports, ensuring uniform heat dissipation across all sections while maintaining reasonable structural complexity.
Solution Approach 2:
The inlet port configuration transitions from a one-dimensional sequential arrangement to a multi-dimensional distributed network. Multiple inlet ports are positioned at different locations and orientations to correspond with different passage inlets, creating a spatially distributed flow distribution system that achieves uniform heat dissipation without excessive structural complexity.
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
This design ensures uniform heat exchange across the fin assembly, overcoming the inefficiencies of previous systems by maintaining consistent heat dissipation performance from the front to the rear sections, enhancing overall heat dissipation efficiency.
Implementation Method 1
a heat generating element of an electronic device (such as a server) is immersed in a dielectric liquid (which is a non-conductive liquid) inside the sealed chassis of the electronic device in order to carry away the heat generated by the heat generating element through the physical properties of the dielectric liquid
Implementation Method 2
the single-phase system uses a pump to drive the dielectric liquid to produce a circulation flow, and operates with a heat and cold exchanger to achieve the effect of heat dissipation
Implementation Method 3
Related-art immersion liquid cooling systems, regardless of the single-phase or biphasic systems, are usually equipped with a heat sink having a plurality of fins and mounted on the heat generating element, and the heat sink is immersed in the dielectric liquid, not only rapidly conducting the heat generated by the heat generating element to each fin
Implementation Method 4
but also cooling down the temperature by the dielectric liquid
Implementation Method 5
the single-phase system uses a pump to drive the dielectric liquid to produce a circulation flow
Implementation Method 6
the biphasic system uses a low boiling point dielectric liquid in connection part with a condenser to continuously produce phase changes of the dielectric liquid, so as to achieve the heat dissipation effect
Implementation Method 7
the biphasic system uses a low boiling point dielectric liquid in connection part with a condenser to continuously produce phase changes of the dielectric liquid
Implementation Method 8
the biphasic system uses a low boiling point dielectric liquid in connection part with a condenser to continuously produce phase changes of the dielectric liquid
Data Source
AI summary
An immersion liquid cooling heat sink includes a substrate, a fin assembly and a housing. The fin assembly is disposed on the substrate and includes a first fin module and a second fin module, both having multiple passages. Each passage has an inlet and an outlet, the first and second fin modules are spaced from each other to form a first groove which communicate between each inlet of the first fin module and each inlet of the second fin module. The housing is disposed on the substrate and has a first liquid inlet port, and covers the entire fin assembly and exposes each outlet. The first liquid inlet port is arranged corresponding to the first groove and communicates to the first groove, so as to enable a dielectric fluid to flow directly from the mid-section to two ends of the fin assembly.