Numerical Study of Turbulent Flow and Heat Transfer of Nanofluids in Pipes

Boertz, Hendrik; Baars, Albert; Cieśliński, Janusz T.; Smoleń, Sławomir

doi:10.1080/01457632.2017.1295739

Cited by 15 publications

(4 citation statements)

References 37 publications

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“…Menni et al, [24] inspected the hydrodynamic and thermal behavior of water, ethylene glycol and water-ethylene glycol as base fluids dispersed by aluminum oxide nano-sized solid particles. Boertz et al, [25] used the single-phase approach to model the flow of SiO2/water-Ethylene glycol nanofluids through a heat pipe heat exchanger under a constant heat flux. The mass ratio of base fluid was 60:40 EG/W, and the nanoparticle concentrations were changed from zero to 10%.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Turbulent Flows and Convective Heat Transfer of Al2O3-Water Nanofluids In A Circular Tube

Mahammedi

Ameur

Menni

et al. 2020

ARFMTS

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The convective heat transfer of Al2O3-water nanofluids through a circular tube with a constant heat flux boundary condition is studied numerically. Turbulent flow conditions are considered with a Reynolds number ranging from 3500 to 20000. The numerical method used is based on the single-phase model. Four volume concentrations of Al2O3-water nanoparticles (0.1, 0.5, 1, and 2%) are used with a diameter of nanoparticle of 40 nm. A considerable increase in Nusselt number, axial velocity, and turbulent kinetic energy was found with increasing Reynolds number and volume fractions. However, the pressure losses were also increased with the raise of Re and nanoparticles concentration.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Turbulent Flows and Convective Heat Transfer of Al2O3-Water Nanofluids In A Circular Tube

Mahammedi

Ameur

Menni

et al. 2020

ARFMTS

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“…Boertz et al 97 used the single-phase approach to model the flow of SiO 2 /water-EG nanofluids through a heat pipe heat exchanger under a constant heat flux. The mass ratio of base fluid was 60:40 EG/W, and the nanoparticle concentrations were changed from 0% to 10%.…”

mentioning

confidence: 99%

Advances of nanofluids in heat exchangers—A review

Menni

Chamkha

Ameur³

2020

Heat Trans

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Recently, many researchers have focused on their studies on the analysis of nanofluid flows due to their participation in the enhancement of heat transfer rates in industrial processes. The ordinary fluids, such as water, mineral oils, and so on, are known for their low thermal conductivity in heat transfer processes. A significant enhancement in the thermal properties of ordinary fluid may be obtained by adding nanoparticles having a diameter of less than 100 nm or suspension of fibers. Better spreading, wetting, dispersion, and stability and with acceptable viscosity are the main advantageous properties of nanofluids on a solid surface. The nanofluids are encountered in various thermal engineering systems such as in heat exchangers, refrigeration, thermal management of fuel cells, cooling of nuclear reactors, microelectromechanical systems, and others. In particular, the thermal conversion is known as a great application of nanotechnology, and many studies have been achieved with such fluids in heat exchangers. Therefore, this paper aims to present a global insight into the different applications of nanofluids in various heat exchangers, that is, heat pipe and plate-fin heat exchangers. All research works have been summarized into three main parts: laminar, transition, and turbulent nanofluid flow regimes.

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“…The term "relaxation time" refers to the balanced state of a system, that is, without interactions with the environment (isolated), yet the phenomenon can be referred approximately to transients. Relaxation processes consequently lead to medium dispersity, which is reflected by the propagation of disturbances at the phase velocity calculated from the relationship [3,24,[42][43][44]:…”

Section: Dynamic Instabilitiesmentioning

confidence: 99%

Regression Model of Dynamic Pulse Instabilities during Condensation of Zeotropic and Azeotropic Refrigerant Mixtures R404A, R448A and R507A in Minichannels

2022

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This paper presents experimental research and mathematical modeling data concerning the impact of unit dynamic instabilities on the phase-transition condensation processes of the zeotropic mixtures R404A and R448A and azeotropic R507A refrigerants in pipe minichannels. The R507 refrigerant is currently used as a temporary substitute for R404A, whereas R448A is a sustainable prospective substitute for R404A. The study presents experimental testing data for the condensation processes of these refrigerants in pipe minichannels and a proposal for the use of dimensional analysis, including the P-Buckingham theorem, to determine the regression relationship explaining the propagation of unit dynamic instabilities. Based on the experimental studies performed, regression computational models were developed and showed satisfactory agreement in the range of 20% to 25%. They give the possibility to identify, in a utilitarian, way the speed of propagation of temperature and pressure instabilities during the liquefaction of refrigerants. The study was carried out on pipe minichannels with an internal diameter of di = 3.3, 2.3, 1.92, 1.44 and 1.40 mm.

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Numerical Study of Turbulent Flow and Heat Transfer of Nanofluids in Pipes

Cited by 15 publications

References 37 publications

Numerical Study of Turbulent Flows and Convective Heat Transfer of Al2O3-Water Nanofluids In A Circular Tube

Numerical Study of Turbulent Flows and Convective Heat Transfer of Al2O3-Water Nanofluids In A Circular Tube

Advances of nanofluids in heat exchangers—A review

Regression Model of Dynamic Pulse Instabilities during Condensation of Zeotropic and Azeotropic Refrigerant Mixtures R404A, R448A and R507A in Minichannels

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