A new effective viscosity model for nanofluids

Etaig, Saleh; Hasan, Reaz; Perera, Noel

doi:10.1108/hff-11-2016-0462

Cited by 7 publications

(6 citation statements)

References 17 publications

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“…review papers by Buongiorno et al (2009), Choi (1995Choi ( ,2009, Choi et al (2004), Kakaç and Pramuanjaroenkij (2009), Wong and Leon (2010), Manca et al (2010), Fan and Wang (2011), Mahian et al (2013), Sheikholeslami and Ganji (2016), Myers et al (2017), Mahian et al (2019aMahian et al ( , 2019b, etc., include the impressive enhancement of thermal conductivity and overall heat transfer. Important results on transfer phenomena in nanofluids can be found also in the papers: Bondareva et al (2015), Sheremet and Pop (2015), Etaig et al (2018) and Sheremet et al (2018).…”

Section: Introductionmentioning

confidence: 95%

MHD free convection flow in an inclined square cavity filled with both nanofluids and gyrotactic microorganisms

Sheremet

Groşan

Pop

2019

HFF

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Purpose This paper aims to study the magnetohydrodynamic (MHD)-free convection flow in an inclined square cavity filled with both nanofluids and gyrotactic microorganism. Design/methodology/approach The benefits of adding motile microorganisms to the suspension include enhanced mass transfer, microscale mixing and anticipated improved stability of the nanofluid. The model includes equations expressing conservation of total mass, momentum, thermal energy, nanoparticles, microorganisms and oxygen. Physical mechanisms responsible for the slip velocity between the nanoparticles and the base fluid, such as Brownian motion and thermophoresis, are accounted for in the model. Findings It has been found that the Hartmann number suppresses the heat and mass transfer, while the cavity and magnetic field inclination angles characterize a non-monotonic behavior of the all considered parameters. A rise of the Hartmann number leads to a reduction of the influence rate of the magnetic field inclination angle. Originality/value The present results are original and new for the study of MHD-free convection flow in an inclined square cavity filled with both nanofluids and gyrotactic microorganisms.

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Section: Introductionmentioning

confidence: 95%

MHD free convection flow in an inclined square cavity filled with both nanofluids and gyrotactic microorganisms

Sheremet

Groşan

Pop

2019

HFF

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“…This is likely as a result of the magnetic properties of the Nanoparticles employed and their tendency to move with respect to the source. Etaig et. al.…”

Section: Numerical Modelingmentioning

confidence: 99%

Determining the Thermal Effects of Channels on Porous Heat Sinks Under Forced Convection Conditions with Nanofluid: An Experimental and Numerical Study

Welsford¹

2021

Preprint

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The present study determines the effects which foam metals and Nanofluid have on the performance of a simulated CPU. The present study employs yAl2O3-water Nanofluid and 6061- T6 Aluminum foam metal with a porosity of 0.91 and permeability of 40 pores per linear inch formed in bulk media and porously filled channels. The concentrations evaluated are 0.1%, 0.3%, and 0.6% by volume. The study shall consider both original empirical results and numerical results obtained from COMSOL Multiphysics, showing good agreement with a maximum error of 4.3%. The present study. When considering the average Nusselt number as the representation of the strength of the heat transfer mechanism, and as such ignoring pumping requirements, it is shown that the use of porously filled channels interacting with 0.6% Nanofluid produces the most effective combination. However, when pumping power is relevant, a combination of bulk porous media interacting with 0.3% Nanofluid is observed. The results obtained herein can be applied to the cooling of electronics, or any other system wherein a general inward heat flux is applied.

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“…Thus, nanoparticles existence affects the heat transfer rate and is required in usages. Several references on nanofluids could be found in books by Nield and Bejan (2013), Das et al (2008), Minkowycz et al (2013) and papers by Shenoy et al (2016), Etaig et al (2018) and in the review papers by Buongiorno et al (2009), Kakaç and Pramuanjaroenkij (2009), Manca et al (2010), Fan and Wang (2011), Mahian et al (2013), Sheikholeslami and Ganji (2016), Myers et al (2017), Rahimi et al (2019), etc. These reviews discuss in detail the preparation of nanofluids, theoretical and experimental investigations of thermal conductivity and viscosity of nanofluids and the work done on convective transport in nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Free convection in an inclined cavity filled with a nanofluid and with sinusoidal temperature on the walls

Cîmpean

Pop

2019

HFF

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Purpose This paper aims to develop a numerical study of the steady natural convection in an inclined square porous cavity filled by a nanofluid with sinusoidal temperature distribution on the side walls and adiabatic conditions on the upper and lower walls. Design/methodology/approach Governing equations transformed in terms of the dimensionless variables using the Darcy–Boussinesq approximation have been solved numerically using a central finite-difference scheme. The Gaus-Siedel iteration technique was used for the system of discretized equations. The two-phase nanofluid model including the Brownian diffusion and thermophoresis effects has been considered for simulation of nanofluid transport inside the cavity. Findings The numerical results of streamlines, isotherms and isoconcentrations are investigated and the effect of different important parameters, such as inclination angle of the cavity, amplitude ratio of the sinusoidal temperature or phase deviation, is discussed. The results obtained for no inclination of the cavity are compared and successfully validated with previous reported results of the literature. The important findings of the study are focused on the changes made by the inclination angle and the periodic thermal boundary conditions, on the heat and fluid flow. Originality/value The originality of the present study is given by the mathematical model presented for an inclined cavity, the numerical solution with new results for inclined cavity and the applications for design of solar energy devices such as solar collectors in which the boundary conditions vary with time because of changes in weather conditions.

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A new effective viscosity model for nanofluids

Cited by 7 publications

References 17 publications

MHD free convection flow in an inclined square cavity filled with both nanofluids and gyrotactic microorganisms

MHD free convection flow in an inclined square cavity filled with both nanofluids and gyrotactic microorganisms

Determining the Thermal Effects of Channels on Porous Heat Sinks Under Forced Convection Conditions with Nanofluid: An Experimental and Numerical Study

Free convection in an inclined cavity filled with a nanofluid and with sinusoidal temperature on the walls

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