Guidelines for Designing Micropillar Structures for Enhanced Evaporative Heat Transfer
- 13 October 2021
- journal article
- research article
- Published by ASME International in Journal of Electronic Packaging
- Vol. 143 (4)
- https://doi.org/10.1115/1.4052465
Abstract
Over the last several decades, cooling technologies have been developed to address the growing thermal challenges associated with high-powered electronics. However, within the next several years, the heat generated by these devices is predicted to exceed 1 kW/cm2, and traditional methods, such as air cooling, are limited in their capacities to dissipate such high heat fluxes. In contrast, two-phase cooling methods, such as microdroplet evaporation, are very promising due to the large latent heat of vaporization associated with the phase change process. Previous studies have shown non-axisymmetric droplets exhibit different evaporation characteristics than spherical droplets. For a droplet pinned atop a micropillar, the solid-liquid and liquid-vapor interfacial area, the volume, and thickness of the droplet are the major factors that govern the evaporation heat transport process. In this work, we develop a shape optimization tool using the particle swarm optimization algorithm to maximize evaporation from a droplet confined atop a micropillar. The tool is used to optimize the shape of a nonaxisymmetric droplet. Compared to droplets atop circular and regular equilateral triangular micropillar structures, we find that droplets confined on pseudo-triangular micropillar structures have 23.7% and 5.7% higher heat transfer coefficients, respectively. The results of this work will advance the design of microstructures that support droplets with maximum heat transfer performance.Keywords
This publication has 33 references indexed in Scilit:
- Computer Simulations of Evaporation of Pinned Sessile Droplets: Influence of Kinetic EffectsLangmuir, 2012
- On the Effect of Marangoni Flow on Evaporation Rates of Heated Water DropsLangmuir, 2008
- A novel particle swarm optimization approach for product design and manufacturingThe International Journal of Advanced Manufacturing Technology, 2008
- Spray cooling heat transfer: The state of the artInternational Journal of Heat and Fluid Flow, 2007
- Assessment of the effectiveness of nanofluids for single-phase and two-phase heat transfer in micro-channelsInternational Journal of Heat and Mass Transfer, 2007
- Evaporative deposition patterns: Spatial dimensions of the depositPhysical Review E, 2005
- Analysis of the Effects of Marangoni Stresses on the Microflow in an Evaporating Sessile DropletLangmuir, 2005
- Topology Optimization of Multicomponent Beam Structure via Decomposition-Based Assembly SynthesisJournal of Mechanical Design, 2005
- Evaporation of a Sessile Droplet on a SubstrateThe Journal of Physical Chemistry B, 2002
- Generalized Bernstein Polynomials and Bézier Curves: An Application of Umbral Calculus to Computer Aided Geometric DesignAdvances in Applied Mathematics, 2001