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Characterization of the heat transfer accompanying electrowetting or gravity-induced droplet motion

机译：伴随电润湿或重力引起的液滴运动的传热特性

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摘要

Electrowetting (EW) involves the actuation of liquid droplets using electric fields and has been demonstrated as a powerful tool for initiating and controlling droplet-based microfluidic operations such as droplet transport, generation, splitting, merging and mixing. The heat transfer resulting from EW-induced droplet actuation has, however, remained largely unexplored owing to several challenges underlying even simple thermal analyses and experiments. In the present work, the heat dissipation capacity of actuated droplets is quantified through detailed modeling and experimental efforts. The modeling involves three-dimensional transient numerical simulations of a droplet moving under the action of gravity or EW on a single heated plate and between two parallel plates. Temperature profiles and heat transfer coefficients associated with the droplet motion are determined. The influence of droplet velocity and geometry on the heat transfer coefficients is parametrically analyzed. Convection patterns in the fluid are found to strongly influence thermal transport and the heat dissipation capacity of droplet-based systems. The numerical model is validated against experimental measurements of the heat dissipation capacity of a droplet sliding on an inclined hot surface. Infrared thermography is employed to measure the transient temperature distribution on the surface during droplet motion. The results provide the first in-depth analysis of the heat dissipation capacity of electrowetting-based cooling systems and form the basis for the design of novel microelectronics cooling and other heat transfer applications.
机译：电润湿（EW）涉及使用电场来驱动液滴，并且已被证明是用于启动和控制基于液滴的微流体操作（如液滴传输，生成，分裂，合并和混合）的强大工具。然而，由于即使是简单的热分析和实验也面临一些挑战，因此由EW引起的液滴驱动所产生的热传递仍未得到充分研究。在目前的工作中，通过详细的建模和实验工作来量化驱动液滴的散热能力。该建模涉及液滴在重力或EW作用下在单个加热板上以及在两个平行板之间运动的三维瞬态数值模拟。确定与液滴运动相关的温度曲线和传热系数。参数分析了液滴速度和几何形状对传热系数的影响。发现流体中的对流模式会严重影响基于液滴的系统的热传输和散热能力。该数值模型针对在倾斜的热表面上滑动的液滴的散热能力的实验测量值进行了验证。红外热像仪用于测量液滴运动过程中表面的瞬时温度分布。结果首次对基于电润湿的冷却系统的散热能力进行了深入分析，并为新型微电子冷却和其他传热应用的设计奠定了基础。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第18期|p.4037-4050|共14页
  • 作者

    Niru Kumari; Suresh V. Garimella;

  • 作者单位

    Cooling Technologies Research Center, em NSFI/UCRC, School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States;

    Cooling Technologies Research Center, em NSFI/UCRC, School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    heat transfer; droplet motion; electrowetting;

    机译：传热液滴运动电润湿;

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