(574c) Copper-Carbon Nanomaterial Composite Coatings for Dramatic Improvements in Phase Change Heat Transfer
AIChE Annual Meeting
Wednesday, November 13, 2019 - 4:20pm to 4:45pm
This talk will examine various strategies to create multiscale surface-active engineered surfaces with tunable properties essentially roughness, porosity, hydrophilicity, wickability and wicking rates and their influence on the heat transfer properties. These surfaces were developed as benchmark studies, to produce a new class of hierarchical porous coatings to improve critical heat fluxes and heat transfer coefficients while facilitating morphology-induced mechanisms such as: wettability, contact angle hysteresis, roughness, and capillary wicking. In addition, the aging characteristics such as surface chemistry and morphology variablity resulting from repetitive chaotic boiling tests will also be discussed. High thermal conductivity along with improved hydrophilicity and wickability of the copper/carbon nanomaterial composites are attributed for the enhanced CHF. High-speed images revealed reduced bubble departure diameters and micro-size pores on the electrodeposited surface serving as nucleation sites. The increase in the bubble frequency and delayed formation of vapor blanket resulted in enhanced heat transfer properties.