Application of a hybrid nanofluid containing graphene nanoplatelet–platinum composite powder in a triple-tube heat exchanger equipped with inserted ribs

Bahiraei, Mehdi; Mazaheri, Nima; Rizehvandi, Ali

doi:10.1016/j.applthermaleng.2018.12.072

Cited by 95 publications

(20 citation statements)

References 34 publications

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“…Bahiraei et al. [23] carried out the research work on applying the graphene – nanoplatelet – platinum composite powder in a triple tube heat exchanger fitted with inserted ribs. They suggested that the greater rib height and smaller rib pitch at more particle volume concentration lead to enhance heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on convective heat transfer and pressure drop of cone helically coiled tube heat exchanger using carbon nanotubes/water nanofluids

Kumaravel¹,

Kumar²

2019

Heliyon

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This study investigates the heat transfer and the pressure drop of cone helically coiled tube heat exchanger using (Multi wall carbon nano tube) MWCNT/water nanofluids. The MWCNT/water nanofluids at 0.1%, 0.3%, and 0.5% particle volume concentrations were prepared with the addition of surfactant by using the two-step method. The tests were conducted under the turbulent flow in the Dean number range of 2200 < De < 4200. The experiments were conducted with experimental Nusselt number is 28%, 52% and 68% higher than water for the nanofluids volume concentration of 0.1%, 0.3% and 0.5% respectively. It is found that the pressure drop of 0.1%, 0.3% and 0.5% nanofluids are found to be 16%, 30% and 42% respectively higher than water. It is studied that the prepared MWCNT/water nanofluids show good stability even after 45 days of preparation and there is no considerable deposit of nanotubes on the tube inner wall. It is also studied that there is no immediate risk of handling MWCNT and studied that there is no significant erosion of coiled tube inner wall surface even after several test runs. Therefore the MWCNT/water nanofluids are the alternate heat transfer fluids for traditional fluids in the cone helically coiled tube heat exchanger to improve the heat transfer with considerable pressure drop.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on convective heat transfer and pressure drop of cone helically coiled tube heat exchanger using carbon nanotubes/water nanofluids

Kumaravel¹,

Kumar²

2019

Heliyon

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“…Therefore, as soon as the phase change material reaches complete melting, it will be possible to recover the required energy from the system in a shorter time. On the other hand, the high-volume fraction of nanoparticles in the phase change material cause the suppression of natural convection heat transfer by the high thermal conductivity coefficient the composition of nanoparticles and phase change material, which prolongs the melting time of the phase change material [35][36][37][38]. It can be seen in Figure 7, that the maximum stored thermal energy is obtained by using 3% SWCNT nanoparticles in combination with RT82 PCM about 3000 W.…”

Section: Stored Thermal Energy In Systemmentioning

confidence: 99%

Evaluation and Improvement of Thermal Energy of Heat Exchangers with SWCNT, GQD Nanoparticles and PCM (RT82)

Rostami

Najafi

Motevalli

et al. 2020

ARFMTS

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Today, due to the reduction of energy resources in the world and its pollutants, energy storage methods and increase the thermal efficiency of various systems are very important. In this research, the thermal efficiency and energy storage of two heat exchangers have been investigated in series using phase change materials (RT82) and single wall carbon nanotubes (SWCNT) and graphene quantum dot nanoparticles (GQD) In this research, two heat exchangers have been used in combination. The first heat exchanger was in charge of storing thermal energy and the second heat exchanger was in charge of heat exchange. The reason for this is to improve the heat exchange of the main exchanger (shell and tube) by using heat storage in the secondary exchanger, which has not been addressed in previous research. The results of this study showed that using two heat exchangers in series, the thermal efficiency of the system has increased. Also, the heat energy storage of the double tube heat exchanger was obtained using phase change materials in the single-walled carbon nanotube composition of about 3000 W. The average thermal efficiency of the two heat exchangers as the series has increased by 52%. In general, the effect of the two heat exchangers on each other was investigated in series with two approaches (energy storage and energy conversion) using fin and nanoparticles, which obtained convincing results.

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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%

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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Application of a hybrid nanofluid containing graphene nanoplatelet–platinum composite powder in a triple-tube heat exchanger equipped with inserted ribs

Cited by 95 publications

References 34 publications

Experimental investigation on convective heat transfer and pressure drop of cone helically coiled tube heat exchanger using carbon nanotubes/water nanofluids

Experimental investigation on convective heat transfer and pressure drop of cone helically coiled tube heat exchanger using carbon nanotubes/water nanofluids

Evaluation and Improvement of Thermal Energy of Heat Exchangers with SWCNT, GQD Nanoparticles and PCM (RT82)

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

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