Salt templated and graphene nanoplatelets draped copper (GNP-draped-Cu) composites for dramatic improvements in pool boiling heat transfer
Autor: | Anju Gupta, Aniket M. Rishi, Satish G. Kandlikar |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Science chemistry.chemical_element Sintering 02 engineering and technology 010402 general chemistry 01 natural sciences Article Engineering Boiling Composite material Porosity Ball mill Multidisciplinary Critical heat flux Thermoelectric devices and materials Microporous material 021001 nanoscience & nanotechnology Copper Mechanical engineering 0104 chemical sciences Superheating chemistry Medicine 0210 nano-technology |
Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-14 (2020) Scientific Reports |
ISSN: | 2045-2322 |
Popis: | We demonstrate a novel technique to achieve highly surface active, functional, and tunable hierarchical porous coated surfaces with high wickability using a combination of ball milling, salt-templating, and sintering techniques. Specifically, using ball-milling to obtain graphene nanoplatelets (GNP) draped copper particles followed by salt templated sintering to induce the strength and cohesiveness to the particles. The salt-templating method was specifically used to promote porosity on the coatings. A systematic study was conducted by varying size of the copper particles, ratio of GNP to copper particles, and process parameters to generate a variety of microporous coatings possessing interconnected pores and tunnels that were observed using electron microscopy. Pool boiling tests exhibited a very high critical heat flux of 289 W/cm2 at a wall superheat of just 2.2 °C for the salt templated 3 wt% GNP draped 20 µm diameter copper particles with exceedingly high wicking rates compared to non-salt-templated sintered coatings. The dramatic improvement in the pool boiling performance occurring at a very low surface temperature due to tunable surface properties is highly desirable in heat transfer and many other engineering applications. |
Databáze: | OpenAIRE |
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