Particle agglomeration and properties of nanofluids

Yang, Yijun; Öztekin, Alparslan; Neti, Sudhakar; Mohapatra, Satish

doi:10.1007/s11051-012-0852-2

Cited by 71 publications

(31 citation statements)

References 24 publications

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“…During this shearing process, agglomerate structures formed in the nanofluid are broken down until they form an ordered arrangement without agglomeration within the limits of high shearing rates [83]. To buttress this point, similar trends and explanations have been offered in a more recent investigation by Yang et al [202], who investigated the rheology of diamond and Al2O3 nanofluids relative to the effect of agglomeration. Two Newtonian base fluids were employed, namely silicone oil (Syltherm 800) and DI-water.…”

Section: Shear Ratementioning

confidence: 82%

The Viscosity of Nanofluids: A Review of the Theoretical, Empirical, and Numerical Models

Meyer

Adio

Sharifpur

et al. 2015

Heat Transfer Engineering

204

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The enhanced thermal characteristics of nanofluids have made it one of the fastest-growing research areas in the last decade. Numerous researches have shown the merits of nanofluids in heat transfer equipment. However, one of the problems is the increase in viscosity due to the suspension of nanoparticles. This viscosity increase is not desirable in the industry, especially when it involves flow, such as in heat exchanger or micro-channel applications INTRODUCTIONColloidal suspension dates back to Maxwell's study in 1873 [1]. Though the idea behind his study was vivid, the imposed problems were too enormous for profitable engineering solutions [2]. In 1995, Choi [3] came up with a pioneering idea based on Maxwell's study and suspended ultrafine particles (nanoparticles) in conventional heat transfer fluids. His invention has opened up a myriad of opportunities in research and development. Nanofluids descriptively are colloidal suspensions containing metallic (Ag, Au, Al, Cu, Ni, etc.), non-metallic (single-and multi-wall carbon nanotube (SWCNT and MWCNT), Si, Graphene, etc.), metallic oxide (Al2O3, CuO, NiO2,TiO2, etc.) and oxides of non-metals (SiO2, SiC, MgO, CaCO3, etc.) nanoparticles suspended in conventional heat transfer fluids such as water, engine oil, ethylene glycol, transformer oil, gear oil or mixture of two or more heat transfer fluids [2,3]. When compared with previous microparticle suspensions in conventional heat transfer fluids, it is a special type of fluid with numerous applications potentials because of its enhanced thermal conductivity, stability and homogeneity [3,4]. Microscale particles in suspensions lead to abrasion, clogging of flow paths, pressure drop and high pumping power requirements, therefore, its sustainability was impossible. Besides, nanofluids can reduce the pumping power in engineering equipment significantly and do not pose the problem of clogging and abrasion of equipment flow paths [5][6][7][8]. Therefore, the design and engineering of physical systems are now being tailored towards using nanofluid as working fluid.The impact of colloidal suspension cuts across the fields of science, biological science, medical, pharmaceutical and engineering. In the context of sustainable energy development and thermal management, nanofluids are becoming more and more significant as the need for efficient thermal management is of paramount importance. Moreover, the level of miniaturisation of devices today as technology advances is overwhelming. Devices such as microprocessors, microelectromechanical systems (MEMS), nanoelectromechanical systems (NEMS), microchannels and lab-on-chips come with high-density heat flux that needs quick heat removal for 3 efficient performance, stability and durability, which, from all indications, could be provided by nanofluids for now [9][10][11][12]. The following are also emerging areas of applications of nanoparticles and nanofluids: (i) they could be useful in medicine in the targeted treatment of malignant cells without damaging healthy tis...

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Section: Shear Ratementioning

confidence: 82%

The Viscosity of Nanofluids: A Review of the Theoretical, Empirical, and Numerical Models

Meyer

Adio

Sharifpur

et al. 2015

Heat Transfer Engineering

204

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show abstract

“…The rheological properties of nanofluids are also closely related to the dispersion state of the nanosuspensions, their stability and the presence (or not) of agglomerates. So, it is clear that shear-thinning behaviour of nanofluids is mainly associated with the presence of nanoparticle agglomerates even with Newtonian base fluids [8][9][10][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Shear History Effect on the Viscosity of Carbon Nanotubes Water-based Nanofluid

Estellé

Halelfadl

Döner

et al. 2013

CNANO

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“…Next, 0.015 g PTFE and 10 mL of a mixture containing PFOS and alcohol was added to the solution. The solution was homogenized using ultrasonic homogenizer for 15 min, followed by 20 min agitation on heater stirrer at 50°C [36][37][38][39][40][41][42][43].…”

Section: Fabrication Of Nanofluidsmentioning

confidence: 99%

“…Then, the solution was sonicated for 15 min in an ultrasonic bath and stirred for 20 min at 50 °C [36][37][38][39][40][41]. …”

Section: Fabrication Of Nanofluidsmentioning

confidence: 99%

Wettability alteration of carbonate rocks from liquid-wetting to ultra gas-wetting using TiO 2 , SiO 2 and CNT nanofluids containing fluorochemicals, for enhanced gas recovery

Esmaeilzadeh

Sadeghi

Fakhroueian

et al. 2015

Journal of Natural Gas Science and Engineering

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Particle agglomeration and properties of nanofluids

Cited by 71 publications

References 24 publications

The Viscosity of Nanofluids: A Review of the Theoretical, Empirical, and Numerical Models

The Viscosity of Nanofluids: A Review of the Theoretical, Empirical, and Numerical Models

Shear History Effect on the Viscosity of Carbon Nanotubes Water-based Nanofluid

Wettability alteration of carbonate rocks from liquid-wetting to ultra gas-wetting using TiO 2 , SiO 2 and CNT nanofluids containing fluorochemicals, for enhanced gas recovery

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