Co-designing electronics with microfluidics for more sustainable cooling

Area of Science:

• Materials Science
• Mechanical Engineering
• Electrical Engineering

Background:

• Electronics power density is increasing due to data growth and miniaturization.
• Current cooling methods are energy and water-intensive, posing environmental challenges.
• Existing embedded cooling solutions do not fully leverage energy-saving potential.

Purpose of the Study:

• To develop a more sustainable and efficient electronic cooling technology.
• To explore the benefits of co-designing microfluidics and electronics on a single substrate.
• To demonstrate a monolithic integrated manifold microchannel cooling structure.

Main Methods:

• Co-designing microfluidic channels and electronic components on a semiconductor substrate.
• Developing a monolithically integrated manifold microchannel cooling structure.
• Experimental validation of heat extraction capabilities and pumping power requirements.

Main Results:

• Achieved heat fluxes exceeding 1.7 kW/cm² with only 0.57 W/cm² pumping power.
• Observed a coefficient of performance over 10,000 for single-phase water-cooling at >1 kW/cm² heat flux.
• Demonstrated a 50-fold increase in performance compared to straight microchannels, with a high average Nusselt number of 16.

Conclusions:

• The integrated cooling technology offers superior thermal management efficiency.
• This approach significantly reduces energy and water consumption for electronics cooling.
• Enables further electronics miniaturization, potentially extending Moore's Law and creating compact power converters.