Metallic Pillars for Two-Phase Flow Stability in 3D IC Cooling
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Solution Overview
Problem
Current two-phase cooling systems for integrated circuits face challenges in effectively managing heat removal and flow stability in 3D ICs, particularly due to rapid bubble growth leading to pressure drop fluctuations and non-uniform heating profiles.
Innovation Solution
The formation of micro-metallic pillars between semiconductor structures within an enclosure facilitates controlled two-phase flow, thermal, and electrical interconnections, stabilizing flow and bubble generation in micro-channels, and providing structural support in 3D chip stacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If two-phase cooling systems are used for high performance ICs, then heat removal efficiency is improved, but pressure drop fluctuations occur due to rapid bubble growth
Solution Approach 1:
The patent introduces a porous coating layer as an intermediary between the micro-channel walls and the coolant. This porous layer acts as a buffer that moderates bubble growth and stabilizes two-phase flow, reducing pressure fluctuations while maintaining effective heat removal from the IC junctions
2Temperature
If micro-channels are embedded inside stackable silicon dies, then temperature profile control is improved, but flow distribution uniformity deteriorates
Solution Approach 1:
The patent applies local quality by creating porous coatings with spatially varying properties - the porous layer density and porosity are optimized locally at different positions within the micro-channels. This allows tailored flow distribution and bubble behavior in different regions, ensuring uniform two-phase flow throughout the embedded micro-channel network while maintaining precise temperature profile control
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 approach enhances two-phase flow stability, generates uniform flow velocity fields, and effectively transfers heat from ICs to the coolant, reducing boiling wall superheat and pressure fluctuations, thereby improving cooling efficiency.
Implementation Method 1
the fluid cooling the arrangement of metallic pillars through a two-phase cooling process
Implementation Method 2
using vaporization near high performance integrated circuits (ICs)
Implementation Method 3
the arrangement of metallic pillars electrically and thermally connect the first semiconductor structure to the second semiconductor structure
Data Source
AI summary
A method of forming metallic pillars between a fluid inlet and outlet for two-phase fluid cooling. The method may include; forming an arrangement of metallic pillars between two structures, the metallic pillars are electrically connected to metallic connecting lines that run through each of the two structures, the arrangement of metallic pillars located between a fluid inlet and a fluid channel, the fluid channel having channel walls running between arrangements of the metallic pillars and a fluid outlet, whereby a fluid passes through the arrangement of metallic pillars to flow into the fluid channel.