An experimental investigation on heat transfer characteristics of graphite-SiO2/water hybrid nanofluid flow in horizontal tube with various quad-channel twisted tape inserts

Dalkılıç, Ahmet Selim; Türk, Osman Alperen; Mercan, Hatice; Nakkaew, Santiphap; Wongwises, Somchai

doi:10.1016/j.icheatmasstransfer.2019.05.013

Cited by 67 publications

(16 citation statements)

References 29 publications

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“…In our work, we used a two-step method that is broadly employed by researchers 54–57 to prepare the graphene oxide-gold nanoparticles/water hybrid nanofluid (GO/Au NPs/water) in different concentrations. Herein, the NPs that were separately generated were dispersed in water by suitable dispersion approaches.…”

Section: Methodsmentioning

confidence: 99%

“…51,52 Hydrophilic graphene nanosheets (graphene oxide) are provided through functionalizing graphene nanosheets using COOH functional groups; thus, it results in the enhancement of the stability of the prepared nanofluids. 53 In our work, we used a two-step method that is broadly employed by researchers [54][55][56][57] to prepare the graphene oxidegold nanoparticles/water hybrid nanofluid (GO/Au NPs/water) in different concentrations. Herein, the NPs that were separately generated were dispersed in water by suitable dispersion approaches.…”

Section: Preparation Of the Hybrid Nanofluidmentioning

confidence: 99%

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Evaluation and optimization of the thermal conductivity enhancement of a water-based GO nanosheets/Au NPs hybrid nanofluid: Box-Behnken design

et al. 2022

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Section: Methodsmentioning

confidence: 99%

Section: Preparation Of the Hybrid Nanofluidmentioning

confidence: 99%

Evaluation and optimization of the thermal conductivity enhancement of a water-based GO nanosheets/Au NPs hybrid nanofluid: Box-Behnken design

et al. 2022

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“…Studies in this direction may assist R & D institutes and scientists in this field in identifying the most significant impediments to the market adoption of nanofluids [69]. Other researchers studied nanofluid applications and parameters that affect their performance [70][71][72][73][74][75][76][77][78][79][80][81][82][83].…”

Section: -160 Min Sonicationmentioning

confidence: 99%

Effects of Key Parameters on Nanofluid Thermal Performance in Heat Exchangers

2023

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Nanofluids are utilized in cooling equipment such as heat exchangers and renewable energies such as solar cells as heat transfer fluid. The techniques for nanofluid stability enhancement and stability evaluations, such as zeta potential, electron microscopy, and photographic techniques for sedimentation, are reviewed as well as some recent achievements in nanofluid stabilization and research on the parameters affecting the thermal properties of nanofluids. Finally, the applications of nanofluids in cooling devices are described. Increased heat transfer, reduced heat transfer time and size of heat exchangers, and finally higher energy and heat efficiency could be the most significant achievements. The parameters affecting the thermal conductivity of nanofluids include concentration, temperature, particle fluid, type of base fluid, and nanoparticles.

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“…There are limited studies in the literature incorporating a higher number of twisted tape inserts in a tube in the forms of separated and joint twisted tapes [40]. Dalkilic et al [41] examined the effect of quad twisted tape inserts in a tube experimentally using hybrid nanofluid for different lengths. They showed that a higher Nusselt number and friction factor could be achieved by increasing the length of the tape inside the tube.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid

Zhu

Mashayekhi

et al. 2021

Nanomaterials

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The hydrothermal performance of multiple semi-twisted tape inserts inside a heat exchanger pipe is numerically examined in three-dimensions. This study aims to find the optimum case for having the highest heat transfer enhancement with the lowest friction factor using nanofluid (Al2O3/water). A performance evaluation criterion (PEC) is defined to characterize the performance based on both friction factor and heat transfer. It was found that increasing the number of semi-twisted tapes increases the number of swirl flow streams and leads to an enhancement in the local Nusselt number as well as the friction factor. The average Nusselt number increases from 15.13 to 28.42 and the average friction factor enhances from 0.022 to 0.052 by increasing the number of the semi-twisted tapes from 0 to 4 for the Reynolds number of 1000 for the base fluid. By using four semi-twisted tapes, the average Nusselt number increases from 12.5 to 28.5, while the friction factor reduces from 0.155 to 0.052 when the Reynolds number increases from 250 to 1000 for the base fluid. For the Reynolds number of 1000, the increase in nanofluid concentration from 0 to 3% improves the average Nusselt number and friction factor by 6.41% and 2.29%, respectively. The highest PEC is equal to 1.66 and belongs to the Reynolds number of 750 using four semi-twisted tape inserts with 3% nanoparticles. This work offers instructions to model an advanced design of twisted tape integrated with tubes using multiple semi-twisted tapes, which helps to provide a higher amount of energy demand for solar applications.

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An experimental investigation on heat transfer characteristics of graphite-SiO2/water hybrid nanofluid flow in horizontal tube with various quad-channel twisted tape inserts

Cited by 67 publications

References 29 publications

Evaluation and optimization of the thermal conductivity enhancement of a water-based GO nanosheets/Au NPs hybrid nanofluid: Box-Behnken design

Evaluation and optimization of the thermal conductivity enhancement of a water-based GO nanosheets/Au NPs hybrid nanofluid: Box-Behnken design

Effects of Key Parameters on Nanofluid Thermal Performance in Heat Exchangers

Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid

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