Study on effect of nanoparticles on boiling phase transition by using molecular dynamics simulation

Yangjun Qin,Yanbiao Wang,Jin Zhao,Zhuolin Tang

doi:10.1063/5.0082551

Abstract

The effects of nanoparticles on phase transition of Ar/Cu nanofluid were performed by adopting non-equilibrium molecular dynamics (NEMD) simulation. For the study of nanofluid phase transition phenomena, the physical parameters of the nanofluid such as total energy, temperature, density, the number of gas atoms, and thermal conductivity of Ar/Cu nanofluid were calculated. By adding more nanoparticles into Ar fluid, the temperature rise rate decreased and the phase transition time occurred in more time. Phase transition time was delayed by up to 24.7%. The results showed that increasing the number of nanoparticles led to more Ar atoms within the solid–liquid interaction forces. Furthermore, the thermal conductivity of Ar/Cu nanofluid was calculated by using the Green–Kubo and NEMD methods. The enhancement of thermal conductivity of nanofluid can be up to 12.5% compared with base fluid, and the maximum thermal conductivity was 0.64 W/mK. The heat flux enhanced with more nanoparticles.

Highlights

Nanofluid1,2 with great thermal conductivity becomes the focus of attention in the field of heat transfer
Abu-Hamdeh et al.21 reported that the barrier size influences the thermal behavior of Ar/Cu nanofluid in molecular dynamics simulation (MDS), and the results showed that the atomic barrier shortens the atomic phase transition time
The conjugate gradient (CG) algorithm42 was applied in energy minimization

Summary

Introduction

Nanofluid with great thermal conductivity becomes the focus of attention in the field of heat transfer. The properties of nanofluid, such as thermal conductivities, convective heat transfer, and boiling heat transfer, were studied by many researchers. The experimental and simulation results showed that the thermal conductivity and heat transfer performance of nanofluids are superior to those of base fluid.. Abu-Hamdeh et al. reported that the barrier size influences the thermal behavior of Ar/Cu nanofluid in MDS, and the results showed that the atomic barrier shortens the atomic phase transition time. Factors such as the scale and internal morphology of the nanochannel influence the phase transition process

Methods

Results

Conclusion