Modifying capillary pressure and boiling regime of micro-porous wicks textured with graphene oxide
- Authors
- Jo, Hong Seok; An, Seongpil; Xuan Hung Nguyen; Kim, Yong Il; Bang, Boo-Hyoung; James, Scott C.; Choi, Jeehoon; Yoon, Sam S.
- Issue Date
- 5-1월-2018
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Heat pipe; Wicking; Capillary pressure; Permeability; Boiling limitation; Graphene oxide
- Citation
- APPLIED THERMAL ENGINEERING, v.128, pp.1605 - 1610
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED THERMAL ENGINEERING
- Volume
- 128
- Start Page
- 1605
- End Page
- 1610
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/78002
- DOI
- 10.1016/j.applthermaleng.2017.09.103
- ISSN
- 1359-4311
- Abstract
- Liquid flow inside a heat pipe due to capillary forces can be used to cool electronic devices. To promote capillary-driven flow, a multilayer, porous wicking surface was designed for optimal liquid transport. The multilayer-porous structure consists of micro-porous structure decorated with nanomaterials. Herein, we demonstrate that micro-porous copper coated with graphene oxide (GO) has elevated capillary forces that can increase both the critical heat flux and the convective heat transfer coefficient. The thin GO layer promotes hydrophilicity that enhances the wettability of the wicking surface. However, an excessively thick GO coating can decrease permeability even in the presence of increased capillary pressures such that overall flow is hindered. In this work an optimal coating thickness is identified and characterized by heat-transfer experiments and scanning electron microscopy. (C) 2017 Elsevier Ltd. All rights reserved.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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