Atomic rheology analysis of the external magnetic field effects on nanofluid in non-ideal microchannel via molecular dyn
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Atomic rheology analysis of the external magnetic field effects on nanofluid in non‑ideal microchannel via molecular dynamic method Yuanzhou Zheng1,2 · Xinzhu Zhang1,2 · Mohammad Nouri3 · Ali Amini3 · Arash Karimipour4 · Maboud Hekmatifar5,6 · Roozbeh Sabetvand7 · Qooyen Ngooyen3 · Aliakbar Karimipour8 Received: 25 March 2020 / Accepted: 17 August 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract In the present study, the molecular dynamics method is used to probe the aggregation phenomenon of hybrid nanoparticle within platinum microchannel with pyramidal barriers. In molecular dynamics simulations, argon atoms are described as base fluid particles and for the interaction between these atoms, we use Lennard-Jones potential, while the platinum–platinum and Al2O3 nanoparticles interactions are simulated applying the embedded atom method force field. To analyze the achieved simulation results, some physical parameters such as potential energy, temperature, and distance of nanoparticles center of mass are calculated. The results show external magnetic field decrease the aggregation phenomenon in nanoparticles. Numerically, by adding external magnetic field to simulation box, the COM distance of nanoparticles reaches to 2.7 Å and the aggregation time of nanoparticles changes from 1.7 to 2.3 ns. These appropriate effects of external magnetic field from our computational study can be used in the design of heat transfer applications. Keywords Hybrid · Molecular dynamic simulation · Aggregation · Microchannel
Introduction A nanofluid can be defined as a fluid having nanosized particles, which is named nanoparticles. The colloidal suspensions of nanoparticles are designed by these fluids [1, 2]. Oxides, metals, silicon carbides, and carbon nanotubes are the components of nanoparticles, which are used in nanofluids. Further, oil, ethylene glycol, and water are some of the common fluids [3]. Innovative features of nanofluids cause * Arash Karimipour [email protected] Aliakbar Karimipour [email protected] 1
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Engineering Research Center of Fujian University for Marine Intelligent Ship Equipment, Minjiang University, Fuzhou 350108, China School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
them potentially effective for lots of uses in heat transmitting, such as fuel cells, microelectronics, pharmaceutic procedures, and hybrid-powered engines, electronic cooling systems, household fridges, chillers, heat exchangers, in machining, grinding equipment and in boiler flue gas temperature decreasing [4, 5]. One of the most importance of these structures is good thermal conductivity of them [6–8]. In comparison with the common fluids, they indicate better thermic power of conducting and convicted heat transmitting 4
Department of Mechanical Engineering, Najafabad branch, Islamic Azad University, Najafabad, Ira
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