Heat transfer enhancement by combination of chaotic advection and nanofluids flow in helically coiled tube

Tohidi, A.; Ghaffari, H.; Nasibi, H.; Mujumdar, Arun S.

doi:10.1016/j.applthermaleng.2015.04.043

Cited by 43 publications

(12 citation statements)

References 29 publications

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“…Nanofluids could be an excellent alternative to conventional coolants. It has been found [28,[54][55][56][57][58][59] that in different applications, nanofluids are capable of increasing the thermal conductivity of the coolant in the range of 15-75% depending on the types of nano-particles and their relative concentrations.…”

Section: Pem Fuel Cell Thermal Managementmentioning

confidence: 99%

Nanofluids to improve the performance of PEM fuel cell cooling systems: A theoretical approach

2016

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Section: Pem Fuel Cell Thermal Managementmentioning

confidence: 99%

Nanofluids to improve the performance of PEM fuel cell cooling systems: A theoretical approach

2016

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“…These helical structures enhance radial mixing and improve mass transfer as well as heat transfer compared to those of a straight pipe, e.g. conventional tube reactors (Acharya et al 1992;Kováts et al 2018;Moulin et al 1996;Tohidi et al 2015;Vashisth et al 2008). The importance of understanding these secondary flow structures is extended also to the human body, where curved and coiled tubes can be found in the form of blood vessels (Bulusu and Plesniak 2018;Ku 1997) and bronchi (Soni et al 2009), for example.…”

Section: Introductionmentioning

confidence: 99%

Tomographic PIV measurements and RANS simulations of secondary flows inside a horizontally positioned helically coiled tube

et al. 2020

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Helically coiled tubes are widely used in industry to enhance heat and mass transfer in the laminar flow regime, due to their secondary flow pattern. In this study, tomographic particle image velocimetry (tomo-PIV) is used in a horizontally coiled helical tube to systematically acquire 3C-3D velocity fields for Reynolds numbers ranging from 20 to 1400 and Dean numbers from 8 to 567. The velocity field evaluations are performed using two different approaches: time-averaged velocity field calculation from instantaneous velocity fields and velocity field determination by cross-correlation from an ensemble of instantaneous reconstructed volumes. Equivalent velocity field accuracy is achieved in both velocity approaches when the flow can be considered stationary. Moreover, numerical simulations were carried out in the same geometry at the same flow conditions and were validated against the experimental 3C-3D data sets. The simulation results show good agreement with the measured velocities, offering the possibility of parametric studies and design optimization. To the authors' best knowledge, this is the first systematic experimental investigation of a helical coil flow by means of 3C-3D velocity measurements, which results can now be used for validation of numerical models in computational fluid dynamics.

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“…They proposed a correlation equation in twist ratio and Reynolds number for friction factor and Nusselt number. Tohidi et al had investigated the two passive techniques (chaotic advection and nanofluid) for heat transfer improvement. Numerical analysis of the performance of different coils like a common configuration and one more with chaotic configuration was carried out.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of taper helical and spiral tube thermal performance

Gupta

Sharma²,

Singh

et al. 2018

Int J Energy Res

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Summary This paper presents the comparative experimental and numerical study of heat exchange through tapers helical and spiral tube. The efficiency of heat exchange is increase the thermal performance as well as productivity. The main study was a focus on these two shapes of pipe at various process parameters like mass flow rate and inlet temperature conditions. Co‐relation equations were developed for both shapes of pipe with a linear fitting tool available in MATLAB coding software. Proper instrumentation and calibration were taken care in this work. The simple horizontal pipe was used to validate the experimental results with computational fluid dynamics (CFD) results. Experimental validation proves that CFD is an effective tool for thermal performance investigation. The main conclusion of present work was that spiral tube displays enhanced thermal enhancement than the helical tube for all process conditions. Thermal contours are also developed for more detailed study on both shapes of the tube.

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Heat transfer enhancement by combination of chaotic advection and nanofluids flow in helically coiled tube

Cited by 43 publications

References 29 publications

Nanofluids to improve the performance of PEM fuel cell cooling systems: A theoretical approach

Nanofluids to improve the performance of PEM fuel cell cooling systems: A theoretical approach

Tomographic PIV measurements and RANS simulations of secondary flows inside a horizontally positioned helically coiled tube

Experimental and numerical investigation of taper helical and spiral tube thermal performance

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