Nanodiamonds – Ethylene Glycol nanofluids: Experimental investigation of fundamental physical properties

Żyła, Gaweł; Vallejo, Javier P.; Fal, Jacek; Lugo, Luis

doi:10.1016/j.ijheatmasstransfer.2018.01.073

Cited by 82 publications

(42 citation statements)

References 62 publications

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“…It should be noted that ethylene glycol (EG) based nanofluids may have viscoelastic structure. These properties were fixed in several papers [9,18,27,[34][35][36]. The EG nanofluids with Fe2O3 particles (29±18 nm) showing shear thinning and thixotropy [9].…”

Section: Results the Effect Of Nanoparticle Size On Rheological Behamentioning

confidence: 99%

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Rheological behavior of water and ethylene glycol based nanofluids containing oxide nanoparticles

Минаков

Rudyak

Pryazhnikov

2018

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The paper presents the results of experimental study of rheological behavior of nanofluids based from consideration of several tens of nanofluids based on water, ethylene glycol and engine oil, containing particles of different oxides and diamond. The sizes of nanoparticles ranged from 5 to 150 nm, while their volume concentration ranged from 0.25 to 8%. At that, no dispersants were used when preparing tested nanofluids. It is shown that in some cases, when increasing nanoparticle concentration, rheological behavior of nanofluids becomes non-Newtonian and is well described by power-law fluid models or Herschel-Bulkley fluids. The influence of nanoparticle size and material, as well as the nature of the base fluid on the rheological behavior of nanofluids have been studied.

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Section: Results the Effect Of Nanoparticle Size On Rheological Behamentioning

confidence: 99%

“…In recent paper [27] the viscoelastic behavior fixed in two EG nanofluids with nanodiamonds particles at very small concentrations (mass fraction from 0.01 to 0.1). It was presented that both examined nanofluid exhibit viscoelastic structure, with high value of storage modulus.…”

Section: Results the Effect Of Nanoparticle Size On Rheological Behamentioning

confidence: 99%

Rheological behavior of water and ethylene glycol based nanofluids containing oxide nanoparticles

Минаков

Rudyak

Pryazhnikov

2018

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The readers can refer to several papers such as Refs. [93][94][95][96][97][98][99][100][101][102][103][104] on the thermal conductivity of EG-based nanofluids and Refs. [105][106][107][108][109][110][111][112][113] on the thermal conductivity of water based nanofluids, as well as comprehensive reviews such as Refs.…”

Section: Experimental Based Correlationsmentioning

confidence: 99%

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

et al. 2019

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It has been more than two decades since the discovery of nanofluids-mixtures of common liquids and solid nanoparticles less than 100 nm in size. As a type of colloidal suspension, nanofluids are typically employed as heat transfer fluids due to their favorable thermal and fluid properties. There have been numerous numerical studies of nanofluids in recent years (more than 1000 in both 2016 and 2017, based on Scopus statistics). Due to the small size and large numbers of nanoparticles that interact with the surrounding fluid in nanofluid flows, it has been a major challenge to capture both the macro-scale and the nano-scale effects of these systems without incurring extraordinarily high computational costs.To help understand the state of the art in modeling nanofluids and to discuss the challenges that remain in this field, the present article reviews the latest developments in modeling of nanofluid flows and heat transfer with an emphasis on 3D simulations. In part I, a brief overview of nanofluids (fabrication, applications, and their achievable thermo-physical properties) will be presented first.Next, various forces that exist in particulate flows such as drag, lift (Magnus and Saffman), Brownian, thermophoretic, van der Waals, and electrostatic double layer forces and their significance in nanofluid flows are discussed. Afterwards, the main models used to calculate the thermophysical properties of nanofluids are reviewed. This will be followed with the description of the main physical models presented for nanofluid flows and heat transfer, from single-phase to Eulerian and Lagrangian two-phase models. In part II, various computational fluid dynamics (CFD) techniques will be presented. Next, the latest studies on 3D simulation of nanofluid flow in various regimes and configurations are reviewed. The present review is expected to be helpful for researchers working on numerical simulation of nanofluids and also for scholars who work on experimental aspects of nanofluids to understand the underlying physical phenomena occurring during their experiments.

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“…Water and toluene were selected as reference materials to perform device calibration. Relative uncertainty of density measurements with this device was established to be lower than 0.1% [67].…”

Section: Thermophysical Characterizationmentioning

confidence: 99%

NePCM Based on Silver Dispersions in Poly(Ethylene Glycol) as a Stable Solution for Thermal Storage

et al. 2019

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The main objective of this study is to design and characterize silver suspensions based on poly(ethylene glycol) PEG400, Ag/PEG400, as energy storage media for low-temperature applications. A polyvinylpyrrolidone (PVP) treatment was applied to ~22 nm silver nanoparticles to ensure good stability in poly(ethylene glycol). An array of different experimental techniques was utilized to analyze the molecular mass and purity of base poly(ethylene glycol), morphology of dry PVP-capped Ag nanoparticles, hydrodynamic average size of dispersed Ag particles, as well as thermal stability of PEG400 and Ag/PEG400 dispersions. Samples exhibited good temporal stabilities with average hydrodynamic diameter around 50 nm according to dynamic light scattering analyses. Melting and solidification transitions were investigated in terms of temperature and enthalpy from differential scanning calorimeter (DSC) thermograms. The thermophysical characterization was completed with thermal conductivity (k), dynamic viscosity (η), isobaric heat capacity (Cp), density (ρ), and surface tension (σ) measurements of designed materials using a Hot Disk thermal conductivimeter, a rotational rheometer, a DSC calorimeter working with a quasi-isothermal modulated method, a U-tube densimeter and a drop shape analyzer, respectively. For a nanoparticle loading of only 1.1% in mass, sub-cooling reduced by 7.1% and thermal conductive improved by 3.9%, with almost no penalization in dynamic viscosity (less than 5.4% of increase). Maximum modifications in Cp, ρ, and σ were 0.9%, 2.2%, and 2.2%, respectively. Experimental results were compared with the values provided by using different theoretical or semi-empirical equations. In particular, good descriptions of dynamic viscosity as functions of temperature and nanoparticle volume concentration were obtained by using the Vogel–Fulcher–Tammann equation and a first-order polynomial η( ϕ v , n p ) correlation, with absolute average deviations of 2.2% and 0.55%, respectively.

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Nanodiamonds – Ethylene Glycol nanofluids: Experimental investigation of fundamental physical properties

Cited by 82 publications

References 62 publications

Rheological behavior of water and ethylene glycol based nanofluids containing oxide nanoparticles

Rheological behavior of water and ethylene glycol based nanofluids containing oxide nanoparticles

Recent advances in modeling and simulation of nanofluid flows-Part I: Fundamentals and theory

NePCM Based on Silver Dispersions in Poly(Ethylene Glycol) as a Stable Solution for Thermal Storage

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