International Journal of Heat and Mass Transfer, volume 166, pages 120801

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

Publication typeJournal Article
Publication date2021-02-01
scimago Q1
wos Q1
SJR1.224
CiteScore10.3
Impact factor5
ISSN00179310, 18792189
Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes
Abstract
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.

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