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Droplet Boiling on Micro-Pillar Array Surface ─ Transition Boiling Regime.

Tianjiao Wang1, Zhixuan Hu1, Shengqiang Shen1

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Summary

This study investigates droplet boiling in transition boiling on micropillar surfaces. Optimized surfaces enhance cooling by controlling droplet behavior and heat transfer for efficient spray cooling.

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Area of Science:

  • Heat Transfer
  • Fluid Dynamics
  • Materials Science

Background:

  • Droplet boiling in transition boiling regime offers high heat transfer capacity and avoids film boiling deterioration.
  • Quantifying transient heat transfer and droplet behavior during transition boiling is challenging.

Purpose of the Study:

  • To systematically investigate droplet boiling in the transition boiling regime on micropillar array surfaces.
  • To analyze transient droplet behavior, liquid bridge motion, three-phase contact line dynamics, and heat transfer performance.
  • To optimize micropillar geometry for enhanced cooling performance.

Main Methods:

  • Utilized a lab-built lattice Boltzmann model to simulate droplet boiling.
  • Analyzed vapor film evolution, morphological changes, and pressure distribution.
  • Investigated the influence of micropillar dimensions on droplet contact time and area.

Main Results:

  • Identified the competition between capillary pressure and vapor film pressure as key to droplet rebound triggers.
  • Demonstrated that low micropillar permeability leads to pressure buildup, facilitating droplet rebound.
  • Showcased the optimization of micropillar geometry for improved cooling performance.

Conclusions:

  • Micropillar array surfaces can be optimized to enhance transition boiling heat transfer.
  • Understanding droplet-vapor interactions and contact line dynamics is crucial for effective spray cooling.
  • The study provides insights into controlling droplet behavior for advanced thermal management solutions.