Journal ArticleDOI
Investigation on Convective Heat Transfer and Flow Features of Nanofluids
Yimin Xuan,Qiang Li +1 more
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TLDR
In this article, an innovative new class of heat transfer fluids can be engineered by suspending metallic nanoparticles in conventional heat-transfer fluids, which are expected to exhibit high thermal conductivities compared to those of currently used heat transfer fluid, and they represent the best hope for enhancing heat transfer.Abstract:
Low thermal conductivity is a primary limitation in the development of energy-efficient heat transfer fluids that are required in many industrial applications. In this paper we propose that an innovative new class of heat transfer fluids can be engineered by suspending metallic nanoparticles in conventional heat transfer fluids. The resulting {open_quotes}nanofluids{close_quotes} are expected to exhibit high thermal conductivities compared to those of currently used heat transfer fluids, and they represent the best hope for enhancement of heat transfer. The results of a theoretical study of the thermal conductivity of nanofluids with copper nanophase materials are presented, the potential benefits of the fluids are estimated, and it is shown that one of the benefits of nanofluids will be dramatic reductions in heat exchanger pumping power.read more
Citations
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Particle size effects in the thermal conductivity enhancement of copper-based nanofluids
TL;DR: It is found that the dispersion characteristics and thermal conductivity performance of copper-based nanofluids exhibited excellent dispersion in the presence of SDBS, which can be directly related to the particle/agglomerate size of the copper nanoparticles in water, as determined from dynamic light scattering.
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Convective Transport in a Nanofluid Saturated Porous Layer With Thermal Non Equilibrium Model
Beer S. Bhadauria,Shilpi Agarwal +1 more
TL;DR: In this article, the effect of local thermal non-equilibrium on linear and non-linear thermal instability in a horizontal porous medium saturated by a nanofluid has been investigated analytically.
Journal ArticleDOI
Comparative numerical study of single-phase and two-phase models for bio-nanofluid transport phenomena
TL;DR: In this article, a computational fluid dynamics simulation of laminar convection of Al2O3-water bio-nanofluids in a circular tube under constant wall temperature conditions was conducted, employing a single-phase model and three different two-phase models (volume of fluid (VOF), mixture and Eulerian).
Journal ArticleDOI
Natural Convection in a Non-Darcy Porous Cavity Filled with Cu–Water Nanofluid Using the Characteristic-Based Split Procedure in Finite-Element Method
TL;DR: In this paper, natural convection of Cu-water nanofluid in a differentially heated non-Darcy porous cavity was numerically investigated by using the characteristic-based split algorithm in finite element method.
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Numerical study of the enhancement of heat transfer for hybrid CuO-Cu nanofluids flowing in a circular pipe
TL;DR: A numerical simulation model for laminar flow of nanofluids in a pipe with constant heat flux on the wall was built to study the effect of the Reynolds number on convective heat transfer and pressure loss, and it was found that the pressure loss increases with an increase in the ReynoldsNumber, nanoparticle density and particle volume fraction.
References
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Book
Introduction to Heat Transfer
TL;DR: In this article, the physical concepts and methodologies of heat and mass transfer are explained for advanced undergraduate engineering majors, using a systematic method for problem solving and discusses the relationship of heat transfer to many important practical applications through examples and problems.
Journal ArticleDOI
Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles
Bock Choon Pak,Young I. Cho +1 more
TL;DR: In this article, the authors used a Brookfield rotating viscometer to measure the viscosities of the dispersed fluids with γ-alumina (Al2O3) and titanium dioxide (TiO2) particles at a 10% volume concentration.
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Thermal Conductivity of Heterogeneous Two-Component Systems
R. L. Hamilton,O. K. Crosser +1 more
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Measuring Thermal Conductivity of Fluids Containing Oxide Nanoparticles
TL;DR: In this paper, a transient hot-wire method was used to measure the thermal conductivity of a small amount of nanoparticles and the experimental results showed that these nanoparticles have substantially higher thermal conductivities than the same liquids without nanoparticles.
Journal ArticleDOI
Conceptions for heat transfer correlation of nanofluids
Yimin Xuan,Wilfried Roetzel +1 more
TL;DR: In this article, the authors proposed two different approaches for deriving heat transfer correlation of the nanofluid, and investigated the mechanism of heat transfer enhancement of the nano-fluid.