Experimental and theoretical studies of thermal conductivity, viscosity and heat transfer coefficient of titania and alumina nanofluids

Utomo, Adi T.; Poth, Heiko; Robbins, Phillip T.; Pacek, Andrzej W.

doi:10.1016/j.ijheatmasstransfer.2012.08.003

Cited by 139 publications

(67 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…At least five types of viscometers with different principles of operations have been used in viscosity measurements, viz. capillary tube viscometer [42,94], vibro-viscometer [17,182], rotating viscometer which includes cone-plate, flat plate and concentric geometries [18,32,43,44,68,76,81,82,85,86,[183][184][185][186][187], falling ball/falling piston viscometer [87] and cup-type viscometer.…”

Section: Experimental Set-upsmentioning

confidence: 99%

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

Meyer

Adio

Sharifpur

et al. 2015

Heat Transfer Engineering

206

View full text Add to dashboard Cite

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...

show abstract

Section: Experimental Set-upsmentioning

confidence: 99%

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

Meyer

Adio

Sharifpur

et al. 2015

Heat Transfer Engineering

206

View full text Add to dashboard Cite

show abstract

“…Utomo et al have investigated thermal conductivity, viscosity and heat transfer coefficient of water-based alumina and titania nanofluids. Results showed that titania and alumina nanofluids do not show unusual enhancement of thermal conductivity heat transfer coefficients in pipe flow frequently reported in literature [27]. Mukesh Kumar et al investigated the heat transfer coefficient and pressure drop of a helically coiled tube heat exchanger handling Al 2 O 3 /water nanofluids is made by using computational fluid dynamics fluent (CFD) software package.…”

Section: Introductionmentioning

confidence: 84%

Investigation of Thermo‐physical Properties of Diatomite/Water Nanofluid

Öztaş¹,

Karakaya²,

İskender³

2016

GMBD

View full text Add to dashboard Cite

In this study, the thermo physical properties of the nanofluid obtained with prepared solution by adding as basic fluid 1.3% the diatomite nanoparticles into water were determined. Many researchers are working to improve the performance of heat transfer fluids. One of the methods used, if we want to increase the overall thermal conductivity of the fluid, the high thermal conductive materials such as metal oxides, metals and carbon should be added to heat transfer fluids as nano-sized particles. In this study, specific heat capacity, thermal conductivity and viscosity of nanofluid obtained with diatomite nanoparticles in order to increase the fluid's thermal performance and not found in the literature were investigated experimentally.

show abstract

“…Фотографии поверхности нагревателей после процесса кипения нанофлюида (x=0.05 %): а -верхняя часть нагревателя; б -нижняя часть нагревателя Исходя из полученных результатов, можно прийти к заключению, что при разработке методики прове-дения исследований теплообмена при кипении на-нофлюидов необходимо включать этапы контроля исследуемого образца нанофлюида и поверхности на-гревателя до и после проведения экспериментов. Так, например, в работе [15] было показано, что даже раз-бавление стабильных (коммерческих) нанофлюидов с большой концентрацией наночастиц может приводить к существенному изменению размера частиц от заяв-ленных производителем. А в работе [9] было показано, что размер частиц Au после проведения эксперимента (кипение нанофлюида R141b/Au в свободном обема) увеличился с 3 до 110 нм.…”

Section: влияние наночастиц на процесс кипения нанофлюидовunclassified

Methodological features in research of pool boiling processes of nanofluid isopropanol/Al2O3

Zhelezny

Семенюк

Гоцульский

et al. 2014

EEJET

View full text Add to dashboard Cite

Experimental and theoretical studies of thermal conductivity, viscosity and heat transfer coefficient of titania and alumina nanofluids

Cited by 139 publications

References 36 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

Investigation of Thermo‐physical Properties of Diatomite/Water Nanofluid

Methodological features in research of pool boiling processes of nanofluid isopropanol/Al2O3

Contact Info

Product

Resources

About