BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
Spreading Characteristics of Nanofluid Droplets Impacting onto a Solid Surface

Participants in the publication
S. M. Sohel Murshed (Author)
INSTITUTO SUPERIOR TÉCNICO
CQE
C. A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE

Summary
This paper reports an experimental investigation on the spreading characteristics of nanofluid droplets impinging on aluminum substrate under the influence of several key factors such as nanoparticle volume fraction, substrate temperature, and the Weber number. Sample nanofluid used is prepared by dispersing several volumetric concentrations (1 to 5%) of titanium dioxide nanoparticles in ethylene glycol. The entire dynamic process of each droplet collision with the substrate surface and the spreading phenomena is captured by using a high speed camera and then the transient spreading diameter and height of droplet are determined. It is found that the higher the concentration of nanoparticles the larger the spreading diameter of nanofluid droplet. As the surface temperature increases, the overall spreading diameter and height of nanofluid droplet significantly decreases and increases, respectively. At larger Weber number, the final spreading of the nanofluid droplet is also found to be larger than that of lower Weber number. Present results demonstrate that spreading characteristics of nanofluid droplets impacting onto solid surface are greatly influenced by each of the aforementioned factors.


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
Journal of Nanoscience and Nanotechnology

Publication Identifiers

Publisher
American Scientific Publishers



Document Identifiers
DOI - https://doi.org/10.1166/jnn.2011.3745
URL - http://dx.doi.org/10.1166/jnn.2011.3745

Keywords
Nanofluids nanoparticles droplet spreading substrate temperature

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