Abstract
Passive pool boiling enhancements offer attractive cooling possibilities to address the demand for effective thermal management in high powered electronic systems. Enhancements in pool boiling have been achieved through area augmentation, providing additional nucleation sites or by inducing liquid wettability changes. Graphene, a two-dimensional material, has garnered significant attention of researchers due to its excellent thermal properties. In this study, heat transfer surfaces are dip coated with an electrochemically generated solution consisting of graphene oxide (GO) and graphene and its pool boiling performance with distilled water at atmospheric pressure was obtained. The surfaces were characterized using X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The static contact angles of the engineered surfaces are measured. The underlying wettability mechanisms are supported by high speed imaging of the nucleating bubbles. A maximum Critical Heat Flux (CHF) of 182 W/cm2 and a Heat Transfer Coefficient (HTC) of 96 kW/m2°C was obtained with the thinnest coating which translated to an enhancement of 42% in CHF and 47% in HTC when compared to a plain uncoated surface.
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