Abstract

In this paper a critical investigation of layering phenomenon has been carried out, by means of experimental and numerical analyses, to explain the differences in thermal conductivity between nanofluids based on metal (Cu) and metal oxide (CuO) nanoparticles. Particularly, molecular dynamics simulations have been developed to investigate the adsorption of water molecules surrounding Cu and CuO nanoparticles of various sizes. Furthermore, different volume concentrations of nanoparticles in water have been analyzed. The numerical results revealed two shell-like formations of water molecules (layers) close to the Cu nanoparticle surface, differently from CuO nanoparticle, where no significant layering phenomenon has been observed. This result can explain the higher thermal conductivity of Cu-based nanofluid with respect to CuO-based one, which has been experimentally measured. The numerical and experimental results lead to the conclusion that layers of ordered water molecules surrounding metal nanoparticles play an important role in explaining experimental data of nanofluid thermal conductivity.

Autore Pugliese

• De Risi Arturo , Colangelo Gianpiero , Milanese Marco

Tutti gli autori

• Milanese M. , Iacobazzi F. , Colangelo G. , de Risi A.

Titolo volume/Rivista

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER

Anno di pubblicazione

2016

ISSN

0017-9310

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

20

Ultimo Aggiornamento Citazioni

28/04/2018

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile