Local Heat Transfer Control using Liquid Dielectrophoresis at Graphene/Water Interfaces

• Published in: International journal of heat and mass transfer 2021-02, Vol.166, p.120801, Article 120801
• Main Authors: Yenigun, Onur, Barisik, Murat
• Format: Article
• Language: English
• Subjects: Electro-freezing; Electro-wetting; Kapitza resistance; Nano-scale heat transfer; Phonon transport
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2020.120801

•We studied heat transfer between few-layer graphene and water.•We obtained an active and local manipulation of heat transfer across two dimensions.•Liquid dielectrophoresis reduce interface thermal resistance to ultra-low values.•High electrode charges increase water thermal conductivity.•Results show an increase of up to nine times local heat transfer. Graphene-based materials are considered for the solution of the thermal management problem of current and next generation micro/nano-electronics with high heat generation densities. However, the hydrophobic nature of few-layer graphene makes passing heat to a fluid very challenging. We introduced an active and local manipulation of heat transfer between graphene and water using an applied, non-uniform electric field. When water undergoes electric field induced orientation polarization and liquid dielectrophoresis, a substantial increase in heat transfer develops due to a decrease in interfacial thermal resistance and increase in thermal conductivity. By using two locally embedded pin and plate electrodes of different sizes, we demonstrated a two-dimensional heat transfer control between two parallel few-layer graphene slabs. We obtained local heat transfer increase up to nine times at pin electrode region with an ultra-low Kapitza resistance through the studied non-uniform electric field strength range creating highly-ordered compressed water in the experimentally measured density limits. With this technique, heat can be (i) distributed from a smaller location to a larger section and/or (ii) collected to a smaller section from a larger region. Current results are important for hot spot cooling and/or heat focusing applications. [Display omitted]