Evaporation of Gold Nanofluid Sessile Drops on Heated Substrate

I. Zaaroura, S. Harmand, J. Carlier, R. Boukherroub
Université Polytechnique Hauts-de-France (UPHF),

Keywords: nanofluids, gold nanoparticles, droplet evaporation, evaporation rate, marangoni cell


Abstract In recent years, nanofluids have received a great deal of attention because of their potential use in many applications. Nanofluids represent a new and innovative class of heat transfer fluids that can be used in a variety of fields, including engine cooling, heat exchangers, microelectronics, fuel cells, and more. In this paper, experiments for investigating the evaporation of gold nanofluid droplets, with two different diameters (5 and 10 nm) and volume concentrations (1 and 4%), were executed on a heated hydrophobic silicon substrate (Amb, 60 and 80 °C). A drop shape analyzer (KRUSS Software) was utilized to record the evaporation process for the profile analysis under the same condition (50% Humidity). Also, an infrared camera was used to observe the droplet surface gradient temperature at the same time. The analysis focus on the effect of nanoparticles diameter and volume concentration on the evaporation rate compared to the base fluid. In addition, the gradient surface temperature instabilities due to marangoni cells affect the dynamic deposition of nanoparticles on the silicon substrate. Keywords: Nanofluids; Gold nanoparticles; Droplet evaporation; Evaporation rate; Marangoni cell