Experimental comparative evaluation of a graphene nanofluid coolant in miniature plate heat exchanger

Wang, Zhe; Wu, Zan; Han, Fenghui; Wadsö, Lars; Sundén, Bengt

doi:10.1016/j.ijthermalsci.2018.04.021

Cited by 73 publications

(27 citation statements)

References 35 publications

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“…Additionally, their density and specific heat capacity can be given according to the following empirical formulas. For detailed processes and analysis, refer to references [40,41].…”

Section: Properties Of Graphene Nanofluidmentioning

confidence: 99%

“…It can be explained that the thermal conductivity of the nanoparticles is significantly higher than that of the base fluid, so as the concentration of the nanofluid increases, the thermal conductivity of the working fluid will be greater than that of the base fluid. In addition, graphene nanoparticles are subjected to Brownian forces in nanofluids to perform irregular Brownian diffusion and thermal diffusion movement [40][41][42]. It makes micro-convection between the nanoparticles and the base fluid, enhances the energy transfer between the nanoparticles and the base fluid, sharpens the destruction of the boundary layer, enhances disturbance, and enhances heat transfer.…”

Section: Performance Analysis Of Heat Exchangermentioning

confidence: 99%

“…The above analysis only demonstrated the positive effects of increasing flow rate and graphene nanoparticle concentration on characterizing enhanced heat transfer. However, the corresponding friction factor will also increase, and the energy efficiency evaluation of the heat exchanger is simply the result of strengthening the trade-off between the enhanced heat transfer and drag coefficient [40,41]. To further quantitatively analyze the effects of different graphene nanofluid concentrations and flow rates on the performance of heat exchangers, Figure 6 shows the relationship between the pump work and thermal efficiency of the heat exchanger.…”

Section: Performance Analysis Of Heat Exchangermentioning

confidence: 99%

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Performance and Exergy Transfer Analysis of Heat Exchangers with Graphene Nanofluids in Seawater Source Marine Heat Pump System

Wang

Han

et al. 2020

Energies

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A marine seawater source heat pump is based on the relatively stable temperature of seawater, and uses it as the system’s cold and heat source to provide the ship with the necessary cold and heat energy. This technology is one of the important solutions to reduce ship energy consumption. Therefore, in this paper, the heat exchanger in the CO2 heat pump system with graphene nano-fluid refrigerant is experimentally studied, and the influence of related factors on its heat transfer enhancement performance is analyzed. First, the paper describes the transformation of the heat pump system experimental bench, the preparation of six different mass concentrations (0~1 wt.%) of graphene nanofluid and its thermophysical properties. Secondly, this paper defines graphene nanofluids as beneficiary fluids, the heat exchanger gains cold fluid heat exergy increase, and the consumption of hot fluid heat is heat exergy decrease. Based on the heat transfer efficiency and exergy efficiency of the heat exchanger, an exergy transfer model was established for a seawater source of tube heat exchanger. Finally, the article carried out a test of enhanced heat transfer of heat exchangers with different concentrations of graphene nanofluid refrigerants under simulated seawater constant temperature conditions and analyzed the test results using energy and an exergy transfer model. The results show that the enhanced heat transfer effect brought by the low concentration (0~0.1 wt.%) of graphene nanofluid is greater than the effect of its viscosity on the performance and has a good exergy transfer effectiveness. When the concentration of graphene nanofluid is too high, the resistance caused by the increase in viscosity will exceed the enhanced heat transfer gain brought by the nanofluid, which results in a significant decrease in the exergy transfer effectiveness.

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“…Additionally, their density and specific heat capacity can be given according to the following empirical formulas. For detailed processes and analysis, refer to references [40,41].…”

Section: Properties Of Graphene Nanofluidmentioning

confidence: 99%

Section: Performance Analysis Of Heat Exchangermentioning

confidence: 99%

Section: Performance Analysis Of Heat Exchangermentioning

confidence: 99%

See 1 more Smart Citation

Performance and Exergy Transfer Analysis of Heat Exchangers with Graphene Nanofluids in Seawater Source Marine Heat Pump System

Wang

Han

et al. 2020

Energies

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“…low thermal conductivity in comparison with solids) and thus allow for the development of high-performance heat transfer fluids [1,2,5,6]. Most of the research on nanofluids focused on the heat transfer, pressure drop, and energy analysis [1,2,[7][8][9][10][11][12][13][14][15]. These main performance parameters depend on broadly researched fundamental properties like thermal conductivity, viscosity, density, and specific heat capacity [3,[16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Influence of graphene oxide nanofluids and surfactant on thermal behaviour of the thermosyphon

Wlaźlak

Zajączkowski

Woluntarski

et al. 2018

J Therm Anal Calorim

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The paper presents a thermal performance analysis of a thermosyphon filled with graphene oxide nanofluid. It focuses on factors influencing thermal resistance and geyser boiling processes, such as the presence of surfactant (here: sodium dodecyl sulphate), the time-related deterioration of nanoparticles, and working conditions. Results indicate that GO nanofluids improved heat transfer at low heat loads and that enhancements were limited to the evaporator section. Although thermal resistance of the device was similar for all tested working fluids at high evaporator temperatures, the timedependent behaviour was different. Both water and GO nanofluid facilitated geyser boiling. Sodium dodecyl sulphate inhibited the phenomenon for pure water, but the same concentration of surfactant in the graphene oxide nanofluid did not show the same effect. SEM analysis showed that substantial amount of surfactant attached to the surface of graphene oxide flakes, which explains the previously described behaviour.

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“…The increase in the number of research articles devoted to the assessment of nanofluids in the heat exchanger shows a noticeable growth and the importance of heat transfer enhancement technology. So, several studies have been focused on the application of nanofluids made of metals or metal oxides nanoparticles such as CuO, ZnO, CeO 2 , Al 2 O 3 , and TiO 2 [7][8][9][10][11], or in some cases the nanofluids made of carbon nanostructures such as carbon nanotubes or graphene nanoplatelets [12][13][14]. The mentioned nanofluids could improve overall heat transfer coefficient and efficiency of the heat exchangers, whereas both nanofluids concentration and volume flow rate have strong effects on the efficiency enhancement.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the colloidal montmorillonite dispersion as a low-cost and eco-friendly nanofluid for improving thermal performance of plate heat exchanger

Hosseini

Mirzaei

2020

SN Appl. Sci.

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Synthetic nanofluids are produced by expensive and complex procedures which hinders their large-scale application in thermal systems. In this study the montmorillonite clay as a natural nanostructure material with a high dispersion ability has been introduced for achieving low cost and eco-friendly water-based green nanofluid. For this purpose, a set of montmorillonite nanofluids (MMTNFs) with different weight fractions of 0.2, 0.4, 0.6, 0.8, and 1% was mechanically prepared. The concentration-dependent properties of the samples including stability, thermal conductivity and viscosity were experimentally evaluated. The results indicated that MMTNFs were accompanied by a primary instability, but they gradually possessed excellent long-term stability. Adding montmorillonite to the water could enhance thermal conductivity up to 8.3%, which is worth with considering the naturalness, abundance and low-cost of this clay. MMT-NFs exhibited excellent thermal performance when utilized as a working fluid instead of the pure water in a plate heat exchanger (PHE). The results showed that the best performance of PHE was obtained at an optimum MMT concentration (0.6 wt%). At optimal condition, the overall heat transfer coefficient, heat transfer rate, and thermal efficiency improved 27.25%, 17.65%, and 7.82%, respectively.

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Experimental comparative evaluation of a graphene nanofluid coolant in miniature plate heat exchanger

Cited by 73 publications

References 35 publications

Performance and Exergy Transfer Analysis of Heat Exchangers with Graphene Nanofluids in Seawater Source Marine Heat Pump System

Performance and Exergy Transfer Analysis of Heat Exchangers with Graphene Nanofluids in Seawater Source Marine Heat Pump System

Influence of graphene oxide nanofluids and surfactant on thermal behaviour of the thermosyphon

Assessment of the colloidal montmorillonite dispersion as a low-cost and eco-friendly nanofluid for improving thermal performance of plate heat exchanger

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