Influence of the base fluid and surfactant arrangement on the enhancement of the heat transfer in metal-nanofluids used in concentrating solar power plants: a molecular level perspective
- Elisa I. Martín
- Antonio Sánchez-Coronilla
- Javier Navas
- Roberto Gómez-Villarejo
- Rodrigo Alcántara
- Concha Fernández-Lorenzo
Editorial: CRC PressTaylor & Francis Group
ISBN: 978-1-1386-0526-8
Año de publicación: 2019
Tipo: Capítulo de Libro
Resumen
This chapter presents a comparative molecular dynamics study of metal based nanofluids with and without the presence of a surfactant. The isobaric specific heat and thermal conductivity values obtained by molecular dynamics calculations show the same tendency as the experimental results for the base fluid and the copper, silver, and nikkel nanofluids and gold (Au) nanofluid with surfactant. Depending on the kind of metal incorporated into the fluid, a different arrangement of the base fluid molecules around the metal nanoparticle is found. Au nanofluids were prepared in presence of a surfactant, and it is of interest to understand its role in the system. Therefore a structural reorganisation of the remaining base fluid molecules around the metal is involved by the movement of surfactant molecules from an inner to outer layer further from the gold unit cell. Improvements in properties such as isobaric specific heat or thermal conductivity have been reported on metal based nanofluids