Up to date review on the synthesis and thermophysical properties of hybrid nanofluids

Gupta, Munish Kumar; Singh, Vandita; Kumar, Satish; Kumar, Sandeep; Dilbaghi, Neeraj; Said, Zafar

doi:10.1016/j.jclepro.2018.04.146

Cited by 167 publications

(59 citation statements)

References 130 publications

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“…This modern type of fluid agent has fascinated numerous researchers owing to its reputation in the emergence and improvement of thermal characteristics in realistic applications, including micro-channel, heat pipes, heat exchangers, air conditioning systems, and mini-channel heat sink [44,45]. Gupta et al [46] and Xian et al [47] have reviewed the preparation method of hybrid nanoparticles along with the stabilization and its significance in industrial sectors. One of the critical elements in establishing a sustainable hybrid nanofluid suspension is selecting an appropriate combination of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Stagnation Point Flow of Hybrid Nanofluid Past a Convectively Heated Stretching/Shrinking Sheet with Velocity Slip

2020

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Unsteady stagnation point flow in hybrid nanofluid (Al2O3-Cu/H2O) past a convectively heated stretching/shrinking sheet is examined. Apart from the conventional surface of the no-slip condition, the velocity slip condition is considered in this study. By incorporating verified similarity transformations, the differential equations together with their partial derivatives are changed into ordinary differential equations. Throughout the MATLAB operating system, the simplified mathematical model is clarified by employing the bvp4c procedure. The above-proposed approach is capable of producing non-uniqueness solutions when adequate initial assumptions are provided. The findings revealed that the skin friction coefficient intensifies in conjunction with the local Nusselt number by adding up the nanoparticles volume fraction. The occurrence of velocity slip at the boundary reduces the coefficient of skin friction; however, an upward trend is exemplified in the rate of heat transfer. The results also signified that, unlike the parameter of velocity slip, the increment in the unsteady parameter conclusively increases the coefficient of skin friction, and an upsurge attribution in the heat transfer rate is observed resulting from the increment of Biot number. The findings are evidenced to have dual solutions, which inevitably contribute to stability analysis, hence validating the feasibility of the first solution.

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Section: Introductionmentioning

confidence: 99%

Unsteady Stagnation Point Flow of Hybrid Nanofluid Past a Convectively Heated Stretching/Shrinking Sheet with Velocity Slip

2020

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“…The thermal characteristics of hybrid nanofluid were higher as compared to the base fluid and fluid with single nanoparticles. Gupta et al (2018) discussed the synthesis and thermophysical properties of the hybrid nanofluids. According to the study, types of nanoparticles, base fluid, substantial volume fraction, particle size and shape were among the elements that can affect thermophysical properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal Marangoni Flow Past a Permeable Stretching/Shrinking Sheet in a Hybrid Cu-Al2O3/Water Nanofluid

Khashi’ie¹,

Arifin²,

Pop³

et al. 2020

JSM

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The present study accentuates the Marangoni convection flow and heat transfer characteristics of a hybrid Cu-Al 2 O 3 / water nanofluid past a stretching/shrinking sheet. The presence of surface tension due to an imposed temperature gradient at the wall surface induces the thermal Marangoni convection. A suitable transformation is employed to convert the boundary layer flow and energy equations into a nonlinear set of ordinary (similarity) differential equations. The bvp4c solver in MATLAB software is utilized to solve the transformed system. The change in velocity and temperature, as well as the Nusselt number with the accretion of the dimensionless Marangoni, nanoparticles volume fraction and suction parameters, are discussed and manifested in the graph forms. The presence of two solutions for both stretching and shrinking flow cases are noticeable with the imposition of wall mass suction parameter. The adoption of stability analysis proves that the first solution is the real solution. Meanwhile, the heat transfer rate significantly augments with an upsurge of the Cu volume fraction (shrinking flow case) and Marangoni parameter (stretching flow case). Both Marangoni and Cu volume fraction parameters also can decelerate the boundary layer separation process.

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“…This shows that CO 2 sorption/desorption capacity increases with increasing nanostructured Cu/TiO(OH) 2 volume fraction during the CO 2 sorption/desorption test, which reaches its peak for a catalyst volume fraction of 0.014%. It is reported that the thermal conductivity of the nanofluid increases with enhanced nanoparticles content . However, nanoparticles bacame agglomerate if further increasing the volume fraction and affect the thermal conductivity of nanofluid.…”

Section: Resultsmentioning

confidence: 99%

Use of nanoparticles Cu/TiO(OH)₂ for CO₂ removal with K₂CO₃/KHCO₃ based solution: enhanced thermal conductivity and reaction kinetics enhancing the CO₂ sorption/desorption performance of K₂CO₃/KHCO₃

Liu

Cai

et al. 2018

Greenhouse Gases

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Global climate change resulting from substantial CO2 emissions is increasingly attracting attention, and coal‐fired power plants are a major source of CO2 emission, so it is necessary to control and reduce CO2 emissions from power plants. Using alkali‐based solutions for CO2 capture is thought to be an effective method to achieve this but poor CO2 sorption/desorption kinetics inhibit its development. The use of nanofluids, prepared by adding nanoparticles to an alkali‐based solution, is a promising way to improve CO2 sorption/desorption reactivity because the addition of nanoparticles not only improves the gas‐liquid mass/heat transfer but also enhances the reaction kinetics. In this paper, a nanostructured Cu/TiO(OH)2 was prepared and used to accelerate the CO2 sorption/desorption performance of a potassium‐based solution. The CO2 sorption/desorption reaction rates increased with the thermal conductivity of the nanofluid but the inclusion of more nanoparticles resulted in particle sedimentation. The potassium‐based solution containing 0.014 vol% of the nanostructured Cu/TiO(OH)2 was therefore the targeted nanofluid that gave the best CO2 sorption/desorption performance and cyclic stability. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Up to date review on the synthesis and thermophysical properties of hybrid nanofluids

Cited by 167 publications

References 130 publications

Unsteady Stagnation Point Flow of Hybrid Nanofluid Past a Convectively Heated Stretching/Shrinking Sheet with Velocity Slip

Unsteady Stagnation Point Flow of Hybrid Nanofluid Past a Convectively Heated Stretching/Shrinking Sheet with Velocity Slip

Thermal Marangoni Flow Past a Permeable Stretching/Shrinking Sheet in a Hybrid Cu-Al2O3/Water Nanofluid

Use of nanoparticles Cu/TiO(OH)₂ for CO₂ removal with K₂CO₃/KHCO₃ based solution: enhanced thermal conductivity and reaction kinetics enhancing the CO₂ sorption/desorption performance of K₂CO₃/KHCO₃

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Up to date review on the synthesis and thermophysical properties of hybrid nanofluids

Cited by 167 publications

References 130 publications

Unsteady Stagnation Point Flow of Hybrid Nanofluid Past a Convectively Heated Stretching/Shrinking Sheet with Velocity Slip

Unsteady Stagnation Point Flow of Hybrid Nanofluid Past a Convectively Heated Stretching/Shrinking Sheet with Velocity Slip

Thermal Marangoni Flow Past a Permeable Stretching/Shrinking Sheet in a Hybrid Cu-Al2O3/Water Nanofluid

Use of nanoparticles Cu/TiO(OH)2 for CO2 removal with K2CO3/KHCO3 based solution: enhanced thermal conductivity and reaction kinetics enhancing the CO2 sorption/desorption performance of K2CO3/KHCO3

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Use of nanoparticles Cu/TiO(OH)₂ for CO₂ removal with K₂CO₃/KHCO₃ based solution: enhanced thermal conductivity and reaction kinetics enhancing the CO₂ sorption/desorption performance of K₂CO₃/KHCO₃