Experimental investigation on silver-graphene hybrid nanofluid droplet evaporation and wetting characteristics of its nanostructured droplet residue

Farooq R. Siddiqui, Edwin C.Y. Tso, Sau C. Fu, Christopher Y.H. Chao, Huihe Qiu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

6 Citations (Scopus)


Droplet evaporation is a complex phase change process with a wide range of cooling applications, such as spray cooling and dropwise hotspot cooling in microelectronics, to name a few. The hybrid nanofluid droplet evaporation and its residue effects on evaporation of the subsequent hybrid nanofluid droplet is investigated in this research. Silver-graphene (Ag-GNP) hybrid nanofluid exhibiting synergistic thermal properties is investigated and prepared by dispersing silver nanoparticles along with graphene nanoplatelets in water at 0.1% volume fraction and with different mixing ratios, followed by ultra-sonication. The evaporation rate and wetting characteristics of a 3 µl volume of Ag-GNP hybrid nanofluid droplet on a copper surface were studied using an optical tensiometer. Once dried, the nanoporous structure of the residue surface was examined using a scanning electron microscope, while the surface roughness was measured using an optical profiler. Experiments were continued to further investigate the evaporation rate and wetting effects of the subsequent Ag-GNP hybrid nanofluid droplet over the residue surface. The results showed improved wetting characteristics, with 88% reduction in initial static contact angle and 163-196% enhancement in evaporation rate of the subsequent Ag-GNP hybrid nanofluid droplets over the residue surfaces as compared to the copper surface.

Original languageEnglish
Title of host publicationFluid Measurement and Instrumentation; Micro and Nano Fluid Dynamics
PublisherAmerican Society of Mechanical Engineers(ASME)
ISBN (Electronic)9780791859070
Publication statusPublished - 2019
EventASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019 - San Francisco, United States
Duration: 28 Jul 20191 Aug 2019

Publication series

NameASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019


ConferenceASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019
Country/TerritoryUnited States
CitySan Francisco


  • Droplet evaporation
  • Droplet residue
  • Hybrid nanofluid
  • Nanostructured surface

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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