Two-phase passive heat carriers/spreaders are effective thermal management tools. However, their thermal performance is limited due to the transport characteristics of their wick structure. To enhance the performance of passive heat spreaders and expand their use to applications with high heat loads and severe operating environments, better wick structures are being developed. Advancements in the design of these structures have been hampered by a lack of models that can predict fluid flow rate in wicks over a wide range of geometrical parameters. The focus of this study is to find such a model for micro-pillar arrays. The model is intended for use in optimizing an array to achieve maximum liquid permeability at a given hydrostatic pressure. Two wicking devices with different pillar spacings were fabricated. The maximum heat transfer capacities of the devices at various wicking lengths were compared with predictions of selected correlations. A model by Byon et al.  predicted the experimental results with reasonable accuracy.
- Heat Transfer Division
Parametric Study of the Transport Properties of Wicking Micro-Pillar Arrays
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Tej, S, Horner, D, & Moghaddam, S. "Parametric Study of the Transport Properties of Wicking Micro-Pillar Arrays." Proceedings of the ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer in Multiphase Systems; Heat and Mass Transfer in Biotechnology. Minneapolis, Minnesota, USA. July 14–19, 2013. V002T07A028. ASME. https://doi.org/10.1115/HT2013-17593
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