Impinging Jet Cooling via Transducer Oscillation
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Solution Overview
Problem
Current cooling techniques for microelectronic devices, such as impinging jet systems, often result in non-uniform cooling and increased costs due to the need for multiple openings and additional pumping devices, which can lead to inefficiencies and higher costs.
Innovation Solution
A controlled jet system that uses transducers to perturb the jet in an out-of-phase mode, stabilizing its oscillation and maintaining maximum downward momentum at a predetermined location, ensuring uniform cooling across a larger area while reducing the need for multiple openings and additional pumping devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple steady impinging jets are used to cool larger areas, then the heat transfer coefficient is maintained at a more uniform level over a wider region, but the device complexity and cost increase due to multiple openings and pumping devices
Solution Approach 1:
The single jet is segmented into multiple coherent vortex structures through transducer-induced oscillations, creating multiple cooling zones from one opening. The jet breaks up into smaller coherent structures that distribute cooling more uniformly across the target surface without requiring multiple physical openings or pumping devices.
Solution Approach 2:
The jet transitions from a steady state to a dynamically oscillating state through transducer actuation. The oscillations at specific frequencies create time-varying flow patterns that enhance mixing and distribute coolant more uniformly across the target area, achieving uniform cooling without additional static openings.
2Device complexity
If a single impinging jet is used for cooling, then the device complexity is reduced, but the cooling is non-uniform and effective only at localized areas with high heat fluxes
Solution Approach 1:
Transducers induce mechanical vibrations in the jet flow at specific frequencies, creating oscillating flow patterns that enhance mixing and distribution. These vibrations break the jet into coherent vortex structures that spread coolant more uniformly across the target surface, transforming localized cooling into area-wide uniform cooling.
Solution Approach 2:
The flow parameters of the jet (velocity, frequency, oscillation amplitude) are dynamically adjusted through transducer actuation. By controlling the oscillation frequency and amplitude, the jet's cooling distribution pattern is modified to achieve uniform heat transfer across the target surface while maintaining a single opening configuration.
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 controlled jet system provides enhanced localized and overall cooling by stabilizing the jet's oscillation, ensuring uniform heat transfer and reducing costs through efficient coolant distribution, thereby improving the cooling performance and flexibility in cooling applications.
Implementation Method 1
Transducers positioned between the material layer and the target near the opening are actuated to perturb the jet in a direction substantially perpendicular to the jet.
Implementation Method 2
A jet of coolant, such as air, is directed through an opening in a material layer toward a target element, such as microelectronic circuits coupled to a circuit board.
Implementation Method 3
Control of the jet stabilizes both jet edges to obtain maximum downward momentum. Thus, the jet washes the target surface without separation, thereby enhancing local cooling.
Data Source
AI summary
A system (50) for cooling a target element (56) includes a structure (52) having an opening (62) extending through the layer (52), a pumping device (32) positioned behind the structure (52), and a target element (56) positioned in front of the structure (52). Transducers (58, 60) are positioned at opposing ends (74, 76) of the opening (62) between the structure (52) and the target element (56). The pumping device (32) drives a jet (70) of coolant through the opening (62) toward the target element (56). The transducers (58, 60) produce output signals (84, 86) that perturb the jet (70) to control oscillation of the jet (70) in order to stabilize the jet (70) for impingement with a predetermined location (96) on the target element (56). The jet (70) uniformly spreads from the location (96) to provide cooling over a surface (100) of the target element (56).