TY - JOUR

T1 - Features of Transport processes of Nanofluids

AU - Rudyak, Valery Ya

N1 - Funding Information: The author is grateful to A. Belkin, D. Guzei, S. Krasnolutsky, A. Minakov, M. Pryazhnikov, and D. Tretyakov, with whom most of the presented results were obtained. This work was carried out with the financial support of the Russian Science Foundation (Project No. 20-19-00043). Publisher Copyright: © 2021 by Begell House, Inc.

PY - 2021

Y1 - 2021

N2 - The current state of the description of the transport processes in nanofluids is discussed. The nanofluids with spherical nanoparticles and single-walled carbon nanotubes are analyzed. It was shown that the viscosity and thermal conductivity of the nanofluids with ordinary spherical nanoparticles are not described by the classical theories. Both viscosity and thermal conductivity depend not only on particles concentration but also on their size and material. The viscosity increases with decreasing particle size, but for thermal conductivity, the opposite behavior is fixed. The rheology of the nanofluids with carbon nanotubes studied is non-Newtonian and is essentially depended on the surfactant used. The thermal conductivity of nanofluids with carbon nanotubes is significantly (at least several times) higher than the thermal conductivity of nanofluids with spherical particles. In all cases, the thermal conductivity of the nanofluids with carbon nanotubes presented is much greater than the corresponding values of the Maxwell theory.

AB - The current state of the description of the transport processes in nanofluids is discussed. The nanofluids with spherical nanoparticles and single-walled carbon nanotubes are analyzed. It was shown that the viscosity and thermal conductivity of the nanofluids with ordinary spherical nanoparticles are not described by the classical theories. Both viscosity and thermal conductivity depend not only on particles concentration but also on their size and material. The viscosity increases with decreasing particle size, but for thermal conductivity, the opposite behavior is fixed. The rheology of the nanofluids with carbon nanotubes studied is non-Newtonian and is essentially depended on the surfactant used. The thermal conductivity of nanofluids with carbon nanotubes is significantly (at least several times) higher than the thermal conductivity of nanofluids with spherical particles. In all cases, the thermal conductivity of the nanofluids with carbon nanotubes presented is much greater than the corresponding values of the Maxwell theory.

KW - nanofluids

KW - nanoparticles

KW - carbon nanotubes

KW - viscosity

KW - thermal conductivity

KW - experiment

KW - molecular dynamics

KW - WALLED CARBON NANOTUBES

KW - THERMAL-CONDUCTIVITY ENHANCEMENT

KW - MOLECULAR-DYNAMICS SIMULATION

KW - HEAT-TRANSFER CHARACTERISTICS

KW - GLYCOL-BASED NANOFLUIDS

KW - AQUEOUS SUSPENSIONS

KW - ETHYLENE-GLYCOL

KW - VISCOSITY COEFFICIENT

KW - RHEOLOGICAL BEHAVIOR

KW - PARTICLE-SIZE

KW - Viscosity

KW - Experiment

KW - Nanofluids

KW - Carbon nanotubes

KW - Molecular dynamics

KW - Nanoparticles

KW - Thermal conductivity

UR - http://www.scopus.com/inward/record.url?scp=85126987574&partnerID=8YFLogxK

U2 - 10.1615/InterfacPhenomHeatTransfer.2021035919

DO - 10.1615/InterfacPhenomHeatTransfer.2021035919

M3 - Article

VL - 9

SP - 29

EP - 50

JO - Interfacial Phenomena and Heat Transfer

JF - Interfacial Phenomena and Heat Transfer

SN - 2169-2785

IS - 2

M1 - 4

ER -