Characteristics of carbon-based nanofluids and their application in a brazed plate heat exchanger under laminar flow

Teng, Tun Ping; Hsiao, Ting Chiang; Chung, Chun Chi

doi:10.1016/j.applthermaleng.2018.09.125

Cited by 45 publications

(16 citation statements)

References 31 publications

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“…When SiO 2 -water nanofluid at a mass concentration of 0.2% was applied, the maximum heat transfer enhancement was achieved, while Al 2 O 3 -water nanofluid achieved the minimum heat transfer enhancement at a mass concentration of 0.1% [269]. The use of carbon-based nanofluids on brazed plate HX and its characteristic was investigated [270]. The results demonstrate a slight decrease in the pressure, while the heat exchange capacity and system efficiency factor were increased by 9.19% and 7.28%, respectively, at a mass concentration of 0.6%.…”

Section: Plate Heat Exchangersmentioning

confidence: 99%

An updated review of nanofluids in various heat transfer devices

Okonkwo

Wole‐Osho

Almanassra

et al. 2020

J Therm Anal Calorim

236

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The field of nanofluids has received interesting attention since the concept of dispersing nanoscaled particles into a fluid was first introduced in the later part of the twentieth century. This is evident from the increased number of studies related to nanofluids published annually. The increasing attention on nanofluids is primarily due to their enhanced thermophysical properties and their ability to be incorporated into a wide range of thermal applications ranging from enhancing the effectiveness of heat exchangers used in industries to solar energy harvesting for renewable energy production. Owing to the increasing number of studies relating to nanofluids, there is a need for a holistic review of the progress and steps taken in 2019 concerning their application in heat transfer devices. This review takes a retrospective look at the year 2019 by reviewing the progress made in the area of nanofluids preparation and the applications of nanofluids in various heat transfer devices such as solar collectors, heat exchangers, refrigeration systems, radiators, thermal storage systems and electronic cooling. This review aims to update readers on recent progress while also highlighting the challenges and future of nanofluids as the next-generation heat transfer fluids. Finally, a conclusion on the merits and demerits of nanofluids is presented along with recommendations for future studies that would mobilise the rapid commercialisation of nanofluids.

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Section: Plate Heat Exchangersmentioning

confidence: 99%

An updated review of nanofluids in various heat transfer devices

Okonkwo

Wole‐Osho

Almanassra

et al. 2020

J Therm Anal Calorim

236

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“…From the cross-section of the THE in Figure 1, Re can be calculated using Equations ( 4)-( 7) [20,30,31]:…”

Section: Preparation Of Cbnfsmentioning

confidence: 99%

“…Then, 1.0 wt% CBNF with 1.6 wt% GA was alternately dispersed using an electromagnetic stirrer (PC420D, Corning, Corning, NY, USA), an ultrasonic bath (5510R-DTH, Branson, St. Louis, MO, USA), a homogenizer (YOM300D, Yotec, Taiwan), and an ultrasonic liquid processor (Q700, Qsonica, Newton, CT, USA). The aforementioned dispersion method was repeated three times to keep superior stability for the CBNFs based on our past research experience [30,[33][34][35]. Next, 1.0 wt% CBNF with 1.6 wt% GA was further diluted with water to a final concentration of 0.05 wt% and 0.2 wt% CBNFs, and the ratio of GA to CBNMs in each CBNFs was fixed at 8:5.…”

Section: Preparation Of Cbnfsmentioning

confidence: 99%

Enhanced Heat Transfer Performance of the Tube Heat Exchangers Using Carbon-Based Nanofluids

Lue

Teng

et al. 2021

Applied Sciences

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The wet ball milling method was used and a dispersant (gum Arabic) was added to prepare various concentrations (0.05 and 0.2 wt%) of carbon-based nanofluids (CBNFs) by a two-step synthesis method as working fluids for heat exchange. CBNFs were actually used in a tube heat exchanger (THE) for heat transfer performance experiments. The heat transfer performance of water and CBNFs was estimated under different heating powers and flow rates of working fluid. The pump power consumption (Ppe) of 0.05 wt% CBNF was found to be similar to that of water, but the Ppe of 0.2 wt% CBNF was higher than that of water. The convective heat transfer coefficient (HTC) of CBNF in the was higher than that of water, and the HTC of 0.05 wt% and 0.2 wt% CBNF was optimal at the heating power of 120 W and 80 W, respectively. The average HTC of 0.05 wt% CBNFs at 120 W heating power was about 3.33% higher than that of water, while that of 0.2 wt% CBNFs at 80 W heating power was about 4.52% higher than that of water. Considering the Ppe and HTC concomitantly, the best overall system performance was exhibited by 0.05 wt% CBNFs.

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“…Obtained OHTC in this study varied in the range of 2123-4503 W/m 2 K. In a research done by Sarafraz et al [39], CuO/water nanofluid was tested in PHE with 36 plates and OHTC was obtained up to 12,000 W/m 2 K. In another work conducted by Variyenli [3], the performance of using fly ash nanofluid in PHE with 16 plates was analyzed and OHTC was obtained between 1400 and 2600 W/m 2 K. Teng et al [40] investigated the utilization of carbon-based nanofluid in PHE and found OHTC in the range of 2700-3300. Figure 10 shows HTC variation with Reynolds number in PHE with eight plates.…”

Section: Experimental Findingsmentioning

confidence: 99%

A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

Gürbüz

Sözen

Variyenli

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Different methods have been utilized to enhance the thermal efficiency of the heat exchangers (HEs). A widely used method to upgrade the thermal efficiency of HEs is upgrading the thermal properties of working fluid by utilizing nanoparticles. In this study, Al 2 O 3 and CuO have been utilized to prepare Al 2 O 3-CuO/water hybrid nanofluid. Accordingly, Al 2 O 3 and CuO nanoparticles have been mixed into the water with 1% (50:50) weight concentration. The main objective of this work is testing the prepared hybrid nanofluid in plate-type HEs (PHEs) with 8, 12 and 16 plates to determine the influence of number of plates on heat transfer improvement by hybrid nanofluid. Experimental findings of the present study demonstrated that utilizing Al 2 O 3-CuO/water hybrid-type nanofluid in the PHE enhanced thermal efficiency notably in comparison with singletype nanofluids. Using this hybrid nanofluid increased the thermal performance in all PHEs with different number of plates. However, it is observed that increasing number of plates led to more increment in thermal performance by utilizing hybrid nanofluid. The highest increment in overall heat transfer coefficient was obtained as 12%, 19% and 20% in PHEs with eight, 12 and 16 plates, respectively. In addition, the highest enhancement in effectiveness was achieved as 10%, 11.7% and 16% in PHEs with eight, 12 and 16 plates, respectively. Keywords Plate heat exchanger • Hybrid nanofluid • Al 2 O 3-CuO/water • Performance List of symbols A Total heat transfer area (m 2) C Heat capacity rate (W/K) c p Specific heat capacity (J/kg K) D h Hydraulic diameter (m) f Friction factor

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Characteristics of carbon-based nanofluids and their application in a brazed plate heat exchanger under laminar flow

Cited by 45 publications

References 31 publications

An updated review of nanofluids in various heat transfer devices

An updated review of nanofluids in various heat transfer devices

Enhanced Heat Transfer Performance of the Tube Heat Exchangers Using Carbon-Based Nanofluids

A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

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