Second law analysis of a hybrid nanofluid in tubes equipped with double twisted tape inserts

Bahiraei, Mehdi; Mazaheri, Nima; Aliee, Faegheh

doi:10.1016/j.powtec.2019.01.060

Cited by 74 publications

(16 citation statements)

References 48 publications

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“…A few studies are available on the use of nanofluids with passive devices for heat transfer enhancement in a tubular heat exchanger. [21][22][23][24] Bahiraei et al 21 studied the energy efficacy of a graphene-platinum nanofluid in tubes with single and multiple twisted tape inserts in co-swirl and counter-swirl conditions. Numerical results demonstrated the heat transfer rate of the tube fitted with the counter swirl tape is higher than those of the other configurations while the co-twisted condition showed the highest pumping power.…”

Section: Heat Transfer Enhancement Using Multiple Tapesmentioning

confidence: 99%

“…They revealed that the counter swirl was better and also four tapes also gave a maximum value of the thermal performance factor. A few studies are available on the use of nanofluids with passive devices for heat transfer enhancement in a tubular heat exchanger . Bahiraei et al studied the energy efficacy of a graphene‐platinum nanofluid in tubes with single and multiple twisted tape inserts in co‐swirl and counter‐swirl conditions.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation on the heat transfer characteristics in a circular pipe using multiple twisted tapes in laminar flow conditions

Kumar

Dinesha

Narayanan

et al. 2019

Heat Trans. Asian Res.

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Introducing passive devices in the form of inserts helps to increase the heat transfer characteristics in a circular pipe. In the present work, the feasibility of using two twisted tapes has been numerically studied under laminar flow conditions. Two twisted tapes with configurations of co‐swirl and counter‐swirl conditions were simulated for Re ranging from 1000 to 2500. Heat transfer characteristics like Nusselt number, friction factor, and thermohydraulic performance index (THPI) were investigated. Even the effect of spacing of the tubes inside the pipe was numerically studied. Results indicated that the insertion of two tapes will improve the performance of the circular tube compared with a single tape in terms of a higher Nu and higher THPI. It is observed that for the co‐swirl condition for a Reynolds number of 1000, Nu and THPI is 38% and 29% higher than using a single tape, whereas, for the counter‐swirl condition, they are 43% and 34% higher than that of the single tape condition. Also, it is revealed that counter swirl positioning of the tape with an L/D ratio 0.56 outperformed all other configurations with the highest THPI.

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Section: Heat Transfer Enhancement Using Multiple Tapesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the heat transfer characteristics in a circular pipe using multiple twisted tapes in laminar flow conditions

Kumar

Dinesha

Narayanan

et al. 2019

Heat Trans. Asian Res.

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“…The hybrid nanofluids such as Ag–MgO–water [ 14 , 15 ], Ag–TiO 2 [ 16 ], Cu–Al 2 O 3 [ 16 , 17 ], and MgO–MWCNTs/EG [ 18 ] as well as using of nonencapsulated phase change material suspension [ 19 ] are also promising for enhancement of heat transfer. On the other hand, combining different techniques to promote the thermohydraulic performance of thermal engineering systems as much as possible has been paid a lot of attention in recent years [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Overlapped Twisted Tapes Inserted in a Double-Pipe Heat Exchanger Using Two-Phase Nanofluid

Ghalambaz

Arasteh

Mashayekhi³

et al. 2020

Nanomaterials

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This study investigated the laminar convective heat transfer and fluid flow of Al2O3 nanofluid in a counter flow double-pipe heat exchanger equipped with overlapped twisted tape inserts in both inner and outer tubes. Two models of the same (co-swirling twisted tapes) and opposite (counter-swirling twisted tapes) angular directions for the stationary twisted tapes were considered. The computational fluid dynamic simulations were conducted through varying the design parameters, including the angular direction of twisted tape inserts, nanofluid volume concentration, and Reynolds number. It was found that inserting the overlapped twisted tapes in the heat exchanger significantly increases the thermal performance as well as the friction factor compared with the plain heat exchanger. The results indicate that models of co-swirling twisted tapes and counter-swirling twisted tapes increase the average Nusselt number by almost 35.2–66.2% and 42.1–68.7% over the Reynolds number ranging 250–1000, respectively. To assess the interplay between heat transfer enhancement and pressure loss penalty, the dimensionless number of performance evaluation criterion was calculated for all the captured configurations. Ultimately, the highest value of performance evaluation criterion is equal to 1.40 and 1.26 at inner and outer tubes at the Reynolds number of 1000 and the volume fraction of 3% in the case of counter-swirling twisted tapes model.

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“…The results revealed that the increasing of the Hartmann number led to the heat conduction domination and a clear reduction in both the heat transfer and ferrofluid rates. More recent studies deal with the nanofluid flow in different geometries [50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

MHD Natural Convection in a Fully Opened Parallelogrammic Enclosure Filled with Copper–Water Nanofluid and Partially Heated from its Left Sidewall

Ghani

Khammas

Mustafa

et al. 2020

ARFMTS

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The present work examined numerically for the first time, the magneto-hydrodynamics (MHD) natural convection flow and heat transfer in a fully opened parallelogrammic enclosure filled with copper-water nanofluid and subjected to a straight magnetic field. Both the upper and lower inclined walls of the enclosure are kept cold, while its right sidewall is considered fully opened to the environment. The left sidewall of the enclosure is heated partially, while the remaining parts of it are considered thermally insulated. The ranges of this study are, Hartmann number (0  Ha  75), nondimensional heat source location (0.25    0.75), Rayleigh number (10 4  Ra  10 6), solid volume fraction (=0.04), and the inclination angle of the upper and the lower walls (-60°    60°). The non-dimensional heat source length is considered fixed at [ = 0.25]. For all Hartmann numbers, It was found that for [Ra =10 6 ] , the maximum

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Second law analysis of a hybrid nanofluid in tubes equipped with double twisted tape inserts

Cited by 74 publications

References 48 publications

Numerical investigation on the heat transfer characteristics in a circular pipe using multiple twisted tapes in laminar flow conditions

Numerical investigation on the heat transfer characteristics in a circular pipe using multiple twisted tapes in laminar flow conditions

Investigation of Overlapped Twisted Tapes Inserted in a Double-Pipe Heat Exchanger Using Two-Phase Nanofluid

MHD Natural Convection in a Fully Opened Parallelogrammic Enclosure Filled with Copper–Water Nanofluid and Partially Heated from its Left Sidewall

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