Energy-efficient micro-jet cooling for high-power electronics using phase-change materials

Project Abstract

The rapid advancement of high-power electronics in data centers, telecommunications, and aerospace systems demands effective thermal management solutions that combine high heat removal capability with energy efficiency and reliability. This work investigates energy-efficient micro-jet cooling employing phase-change materials (PCMs) as a hybrid cooling strategy to manage the intense heat fluxes associated with modern electronic devices. The core objective is to enhance thermal performance while reducing pumping power and enabling compact, robust cooling modules suitable for integration with next-generation microprocessors and power electronics modules. A multi-fidelity approach is adopted, combining experimental measurements, advanced numerical simulations, and materials characterization to capture the coupled phenomena of phase transition, jet impingement heat transfer, and electronic enclosure dynamics. The study begins with a comprehensive analysis of the governing heat transfer mechanisms in micro-jet cooling, including forced convection, jet-to-surface impingement, and latent heat absorption/release during PCM phase transitions. We formulate a coupled heat transfer model that integrates Navier–Stokes equations for the jet flow with enthalpy-based energy equations for the PCM, incorporating surface microstructures and contact resistance at the chip–coolant interface. The PCM is selected for its high latent heat, tunable melting point, and chemical compatibility with common substrate materials, enabling pronounced thermal buffering during transient power pulses. The model is validated against high-resolution infrared thermography and micro-thermocouple arrays, as well as phase-field simulations of melting and solidification fronts. A novel experimental setup is developed to quantify the performance of PCM-enhanced micro-jet cooling under realistic duty cycles and varying power loads. Key metrics include maximum chip temperature, temperature uniformity, thermal resistance, and cumulative energy consumption of the pump. The PCM’s melting behavior is engineered through alloying and microencapsulation techniques to achieve tailored phase-change temperatures near the device’s critical thermal threshold. We explore jet operating parameters— Reynolds number, jet-to-target standoff distance, and nozzle geometry— to maximize heat transfer coefficients while minimizing pumping energy. In addition, the influence of PCM porosity, packing density, and thermal conductivity enhancements via nano-fillers is systematically investigated to optimize latent-heat storage and conduction pathways. The results reveal that PCM-assisted micro-jet cooling can deliver substantial reductions in peak temperatures by leveraging latent heat during transient spikes, while the high convective coefficients of micro-jet impingement maintain surface temperatures within safe margins. The hybrid approach demonstrates up to X% improvement in energy efficiency over conventional single-phase micro-jet cooling under the same load conditions, with notable gains in thermal uniformity and reduced pump power. Sensitivity analyses identify critical design parameters, including PCM melting temperature, jet velocity, and interfacial thermal resistance, guiding practical implementation. The study provides a scalable framework for integrating PCM-enhanced micro-jet cooling into compact electronic packages, contributing to prolonged device life, increased performance margins, and reduced energy footprints in high-power applications.

Project Overview

What This Project Is About

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A straightforward look at how tiny jets of fluid (micro-jet cooling) can remove heat from powerful electronics. The project explores using phase-change materials to absorb heat more efficiently as temperatures rise, helping devices run cooler and longer.

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The Problem It Addresses

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High-power electronics generate a lot of heat. Traditional cooling methods struggle to keep temperatures low without bulky systems or high energy use. This project investigates a compact cooling approach that can handle high heat load while saving energy and reducing size.

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Objectives of the Project

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1. Understand how micro-jet cooling works and why phase-change materials can help.
2. Model heat transfer in a micro-jet cooling setup with phase-change materials.
3. Evaluate performance metrics such as heat removal efficiency and temperature uniformity.
4. Identify design parameters that optimize cooling while minimizing energy use.
5. Provide guidelines for practical implementation in electronics packaging.

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What You Will Do Step by Step

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1) Review basic cooling concepts and phase-change materials. 2) Create simple models of heat transfer in a micro-jet setup. 3) Simulate how the material absorbs heat during phase change. 4) Compare different jet and material configurations. 5) Analyze results for temperature, efficiency, and stability. 6) Discuss practicality for real devices and potential improvements.

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Expected Outcome

Anticipated findings include a demonstration that micro-jet cooling with phase-change materials can achieve lower peak temperatures and higher energy efficiency, with clear guidance on feasible designs for integration into electronic systems.