Experimental and Numerical Study of Turbulent Fluid Flow and Heat Transfer of Al<sub>2</sub>O<sub>3</sub>/Water Nanofluid in a Spiral-Coil Tube

Doshmanziari, Faramarz Ilami; Kadivar, Mohammadreza; Yaghoubi, M.; Jalali-Vahid, D.; Arvinfar, Mohammad Ali

doi:10.1080/01457632.2016.1200380

Cited by 23 publications

(14 citation statements)

References 28 publications

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“…Water–Al 2 O 3 nanofluid at φ = 0 and φ = 0.5 per cent, inlet diameter of 8 mm and length of 3.45 m for spiral coil tube was considered, whereas the inlet temperature was 34°C. It is noticed that in Table V, the numerical predictions are in acceptable agreement with experimental data work (Doshmanziari et al , 2017 ) (maximum and average relative errors are 4.76 and 2.43 per cent, respectively). Hence, the used two-phase method is valid and, therefore, is used to simulate the nanofluid behavior in the current research.…”

Section: Problem Definition and Mathematical Methodssupporting

confidence: 76%

Energy saving with using of elliptic pillows in turbulent flow of two-phase water-silver nanofluid in a spiral heat exchanger

Khodabandeh

Toghraie

Chamkha

et al. 2019

HFF

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Purpose Increasing heat transfer rate in spiral heat exchangers is possible by using conventional methods such as increasing number of fluid passes and counter flowing. In addition, newer ideas such as using pillows as baffles in the path of cold and hot fluids and using nanofluids can increase heat transfer rate. The purpose of this study is to simulate turbulent flow and heat transfer of two-phase water-silver nanofluid with 0-6 Vol.% nanoparticle concentration in a 180° path of spiral heat exchanger with elliptic pillows. Design/methodology/approach In this simulation, the finite volume method and two-phase mixture model are used. The walls are subjected to constant heat flux of q″ = 150,000 Wm−2. The inlet fluid enters curves path of spiral heat exchanger with uniform temperature Tin = 300 K. After flowing past the pillows and traversing the curved route, the working fluid exchanges heat with hot walls and then exits from the section. In this study, the effect of radiation is disregarded because of low temperature range. Also, temperature jump and velocity slipping are disregarded. The effects of thermophoresis and turbulent diffusion on nanofluid heat transfer are disregarded. By using finite volume method and two-phase mixture model, simulations are performed. Findings The results show that the flow and heat transfer characteristics are dependent on the height of pillows, nanoparticle concentration and Reynolds number. Increasing Reynolds number, nanoparticle concentration and pillow height causes an increase in Nusselt number, pressure drop and pumping power. Originality/value Turbulent flow and heat transfer of two-phase water-silver nanofluid of 0-6 per cent volume fraction in a 180° path of spiral heat exchanger with elliptic pillows is simulated.

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Section: Problem Definition and Mathematical Methodssupporting

confidence: 76%

Energy saving with using of elliptic pillows in turbulent flow of two-phase water-silver nanofluid in a spiral heat exchanger

Khodabandeh

Toghraie

Chamkha

et al. 2019

HFF

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“…Kai et al found that compared with distilled water, the heat transfer coefficient and the Nu of silica nanofluids in circular tubes were significantly increased. The results of Doshmanziari et al . showed that the convective heat transfer coefficient of nanofluids was 61% higher than that of base fluids.…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size on the Heat Transfer Performance of SiO₂–Water Nanofluids

Zhang

Jing

et al. 2021

J. Phys. Chem. C

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It is common to improve heat transfer performance to meet the needs of small volume, low energy consumption, and high heat transfer performance of heat exchangers and mixers in industrial production. In the process of heat transfer, the fluid type considerably influences the heat transfer performance. Consequently, nanofluidswhich do not easily cause friction or blockages and which have the advantage of enhancing heat transferare used in place of traditional fluids to meet the abovementioned heat transfer requirements. In this work, an experimental system is established to measure the heat transfer performance of SiO2–water nanofluids. The convective heat transfer coefficients of SiO2–water nanofluids with different particle sizes are measured. The effects of particle sizes and the Reynolds number (Re) on the heat transfer coefficients are discussed. The results show that the particle size of SiO2 nanoparticles and Re have an important influence on the convective heat transfer coefficient. By adding SiO2 nanoparticles with particle sizes of 15, 30, and 80 nm in water, it is found that the convective heat transfer coefficient of nanofluids increases by 36.8, 30.2, and 23.6%, respectively, compared with that of pure water under the same Re. The change in the convective heat transfer coefficient in different regimes is compared. It is found that the convective heat transfer coefficient increases most near the transition point of laminar turbulence. The changes in physical properties of nanofluids with different particle sizes and the contribution ratio of micro-motion of nanoparticles to the increase in the convective heat transfer coefficient are investigated. The results show that with the change in the Reynolds number, the contribution of physical parameters to the convective heat transfer coefficient has not exceeded 50%. At the same time, it is found that the traditional single-phase convection heat transfer formula is not suitable for calculating the heat transfer coefficient of SiO2–water nanofluids. Therefore, the correlations for calculating the convective heat transfer of SiO2–water nanofluids in laminar and turbulent regimes are established.

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“…Under different flow conditions, Doshmanziari et al 108 addressed by experimental and numerical measurements the thermal performance of Al 2 O 3 /water nanofluid flowing in a spiral-coil tube. Compared with the base fluid, a thermal enhancement by about 61% was obtained, and a corresponding correlation was established.…”

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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Experimental and Numerical Study of Turbulent Fluid Flow and Heat Transfer of Al₂O₃/Water Nanofluid in a Spiral-Coil Tube

Cited by 23 publications

References 28 publications

Energy saving with using of elliptic pillows in turbulent flow of two-phase water-silver nanofluid in a spiral heat exchanger

Energy saving with using of elliptic pillows in turbulent flow of two-phase water-silver nanofluid in a spiral heat exchanger

Effect of Particle Size on the Heat Transfer Performance of SiO₂–Water Nanofluids

Advances of nanofluids in heat exchangers—A review

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Experimental and Numerical Study of Turbulent Fluid Flow and Heat Transfer of Al2O3/Water Nanofluid in a Spiral-Coil Tube

Cited by 23 publications

References 28 publications

Energy saving with using of elliptic pillows in turbulent flow of two-phase water-silver nanofluid in a spiral heat exchanger

Energy saving with using of elliptic pillows in turbulent flow of two-phase water-silver nanofluid in a spiral heat exchanger

Effect of Particle Size on the Heat Transfer Performance of SiO2–Water Nanofluids

Advances of nanofluids in heat exchangers—A review

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Product

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Experimental and Numerical Study of Turbulent Fluid Flow and Heat Transfer of Al₂O₃/Water Nanofluid in a Spiral-Coil Tube

Effect of Particle Size on the Heat Transfer Performance of SiO₂–Water Nanofluids