Article: Use of nanofluids as coolants in buoyancy-driven thermal management of embedded heating components of small-scale devices Journal: Progress in Computational Fluid Dynamics, An International Journal (PCFD) 2019 Vol.19 No.4 pp.250 - 263 Abstract: A two-phase model based on the double-diffusive approach is used to perform a numerical study on natural convection of water-based nanofluids in square cavities partially heated at the bottom wall and cooled at both sides, assuming that Brownian diffusion and thermophoresis are the only slip mechanisms by which the solid phase can develop a significant relative velocity with respect to the liquid phase. Numerical simulations are basically executed for Al2O3 + H2O, using the diameter and the average volume fraction of the suspended nanoparticles, the cavity width, the heated fraction of the bottom wall, the average temperature and the temperature difference imposed across the cavity, as independent variables. Additional simulations are also performed using CuO or TiO2 nanoparticles. It is found that the cooperation between the solutal and thermal buoyancy forces results in a significant enhancement of the heat transfer performance of the nanofluid compared with the pure base liquid. Inderscience Publishers - linking academia, business and industry through research

Title: Use of nanofluids as coolants in buoyancy-driven thermal management of embedded heating components of small-scale devices

Authors: Massimo Corcione; Paweł Ocłoń; Alessandro Quintino; Elisa Ricci; Andrea Vallati

Addresses: DIAEE Sezione Fisica Tecnica, Sapienza Università di Roma, via Eudossiana 18, 00184 Rome, Italy ' Institute of Thermal Power Engineering, Cracow University of Technology, al. Jana Pawła II 37, 31-864 Kraków, Poland ' DIAEE Sezione Fisica Tecnica, Sapienza Università di Roma, via Eudossiana 18, 00184 Rome, Italy ' DIAEE Sezione Fisica Tecnica, Sapienza Università di Roma, via Eudossiana 18, 00184 Rome, Italy ' DIAEE Sezione Fisica Tecnica, Sapienza Università di Roma, via Eudossiana 18, 00184 Rome, Italy

Abstract: A two-phase model based on the double-diffusive approach is used to perform a numerical study on natural convection of water-based nanofluids in square cavities partially heated at the bottom wall and cooled at both sides, assuming that Brownian diffusion and thermophoresis are the only slip mechanisms by which the solid phase can develop a significant relative velocity with respect to the liquid phase. Numerical simulations are basically executed for Al₂O₃ + H₂O, using the diameter and the average volume fraction of the suspended nanoparticles, the cavity width, the heated fraction of the bottom wall, the average temperature and the temperature difference imposed across the cavity, as independent variables. Additional simulations are also performed using CuO or TiO₂ nanoparticles. It is found that the cooperation between the solutal and thermal buoyancy forces results in a significant enhancement of the heat transfer performance of the nanofluid compared with the pure base liquid.

Keywords: nanofluid; natural convection; square enclosure; partially-heated bottom wall; two phase modelling; enhanced heat transfer.

DOI: 10.1504/PCFD.2019.100872

Progress in Computational Fluid Dynamics, An International Journal, 2019 Vol.19 No.4, pp.250 - 263

Received: 25 Apr 2017
Accepted: 13 Nov 2017
Published online: 19 Jul 2019 *

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Title: Use of nanofluids as coolants in buoyancy-driven thermal management of embedded heating components of small-scale devices

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