Alternating Current Electrothermal Flow for Energy Efficient Thermal Management of Microprocessor Hot Spots

TL;DR

This paper introduces an energy-efficient cooling method using Alternating Current Electrothermal Flow (ACET) to reduce microprocessor hot spots by over 30%, leveraging heat sources to drive fluid flow without external power.

Contribution

The study demonstrates a novel ACET-based cooling technique that is highly energy efficient and effective for microprocessor thermal management, with detailed parametric analysis and comparison to existing methods.

Findings

Hot spot temperature reduced by over 30% at 10-12 V AC voltage.

Optimal fluid conductivity range maximizes cooling efficiency.

ACET outperforms other micro-cooling technologies in energy efficiency.

Abstract

The paper presents numerical results on an innovative concept of an efficient, site-specific cooling technology for microprocessor hot spots using Alternating Current Electrothermal Flow (ACET). ACET deploys an electrokinetic transport mechanism without requiring any external prime mover and can be shown to be highly effective in reducing hot spot temperatures below their allowable limits. The proposed technique leverages the heat source(s) itself to drive the fluid in the ACET cooling mechanism, thereby making this a highly energy efficient active technique. Our parametric analyses present the optimal range of fluid properties, viz. electrical conductivity where the cooling efficiency is maximum. Further, the impact of geometrical parameters as well as input voltages has been characterized. Our results show a reduction of hot spot temperature by more than 30% for flow through a channel of 600 microns under appropriate conditions at an applied AC voltage of 10-12 V. Comparison with other micro-cooler technologies show the proposed technique to be more energy efficient in its range of operation. These results establish the potential of the ACET cooling and can open up a new avenue to be explored for thermal management of miniaturized devices and systems.