Experimental study of convective heat transfer and pressure drop of TiO2/water nanofluid

Kayhani, M. H.; Soltanzadeh, Hamidreza; Heyhat, Mohammad Mahdi; Nazari, Mohsen; Kowsary, Farshad

doi:10.1016/j.icheatmasstransfer.2012.01.004

Cited by 167 publications

(51 citation statements)

References 18 publications

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“…Kayhani et al [152] functionalized spherical TiO 2 nanoparticles, of 15 nm particles size, by chemical treatment to achieve stabilized TiO 2 /DW nanofluids. Titanium dioxide powder was mixed with 1,1,1,3,3,3, hexamethyldisilazane (C6H19NSi2), at a mass fraction ratio of 2 : 1, and then sonicated for 1 h under 30 ∘ C to obtain soaked nanoparticles.…”

Section: Surface Modification Techniquesmentioning

confidence: 99%

“…There were few attempts undertaken to measure the density of nanofluids experimentally, as the majority of researchers tend to use the mixing theory in order to predict its value [152,. Sommers and Yerkes [211] measured the effective density of alumina/propanol nanofluid, of 10 ± 5 nm average particles size and 0-4 wt% concentration, at room temperature using two ways: (1) hydrometer and (2) weighting a sample, of known volume, with a high precision balance (±0.001 g).…”

Section: Effective Densitymentioning

confidence: 99%

See 1 more Smart Citation

A Review on Nanofluids: Fabrication, Stability, and Thermophysical Properties

Ali

Teixeira

Addali

2018

Journal of Nanomaterials

283

174

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Nanofluids have been receiving great attention in recent years due to their potential usage, not only as an enhanced thermophysical heat transfer fluid but also because of their great importance in applications such as drug delivery and oil recovery. Nevertheless, there are some challenges that need to be solved before nanofluids can become commercially acceptable. The main challenges of nanofluids are their stability and operational performance. Nanofluids stability is significantly important in order to maintain their thermophysical properties after fabrication for a long period of time. Therefore, enhancing nanofluids stability and understanding nanofluid behaviour are part of the chain needed to commercialise such type of advanced fluids. In this context, the aim of this article is to summarise the current progress on the study of nanofluids, such as the fabrication procedures, stability evaluation mechanism, stability enhancement procedures, nanofluids thermophysical properties, and current commercialisation challenges. Finally, the article identifies some possible opportunities for future research that can bridge the gap between in-lab research and commercialisation of nanofluids.

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Section: Surface Modification Techniquesmentioning

confidence: 99%

Section: Effective Densitymentioning

confidence: 99%

A Review on Nanofluids: Fabrication, Stability, and Thermophysical Properties

Ali

Teixeira

Addali

2018

Journal of Nanomaterials

283

174

View full text Add to dashboard Cite

show abstract

“…Kayhani et al [68] studied the convective heat transfer coefficient and pressure drop of water-based TiO 2 by passing it through uniformly heated horizontal circular tubes and observed an increase in the heat transfer coefficient by increasing the nanofluid volume concentration. The TiO 2 nanoparticles were sonicated for 1 h at 30 • C permitting it to place groups of hydrophilic ammonium on the surface of the TiO 2 nanoparticles after mixing with 1,1,1,3,3,3 hexamethyldisilazane.…”

Section: Ultrasonication Methodsmentioning

confidence: 99%

Preparation Techniques of TiO2 Nanofluids and Challenges: A Review

et al. 2018

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Titanium dioxide (TiO 2 ) has been used extensively because of its unique thermal and electric properties. Different techniques have been used for the preparation of TiO 2 nanofluids which include single-step and two-step methods. In the natural world, TiO 2 exists in three different crystalline forms as anatase, brookite, and rutile. Nanoparticles are not used directly in many heat transfer applications, and this provides a major challenge to researchers to advance towards stable nanofluid preparation methods. The primary step involved in the preparation of nanofluid is the production of nano-sized solid particles by using a suitable technique, and then these particles are dispersed into base fluids like oil, water, paraffin oil or ethylene glycol. However, nanofluid can also be prepared directly by using a liquid chemical method or vapor deposition technique (VDT). Nanofluids are mostly used in heat transfer applications and the size and cost of the heat transfer device depend upon the working fluid properties, thus, in the past decade scientists have made great efforts to formulate stable and cost-effective nanofluids with enhanced thermophysical properties. This review focuses on the different synthesis techniques and important physical properties (thermal conductivity and viscosity) that need to be considered very carefully during the preparation of TiO 2 nanofluids for desired applications.

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“…Further, a study on convective heat transfer and pressure drop in a turbulent flow of aqueous solution of given nanoparticle (15 nm) through a constantly heated horizontal circular tube containing 0.1, 0.5, 1.0, 1.5 and 2.0% volume concentrations of nanoparticles was performed by Kayhani et al (2012). Results indicated that heat transfer coefficients increased with increasing the nanofluid volume fraction but showed no change with changing the Reynolds number.…”

Section: Experimental Studies On Forced Convective Heat Transfer Of Nmentioning

confidence: 99%

A comprehensive review of experimental investigations of forced convective heat transfer characteristics for various nanofluids

Gupta

Arora

Kumar

et al. 2014

Int J Mech Mater Eng

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Nanofluids are suspension of nanoparticles (less than 100 nm) in the conventional base fluids. The dispersed solid metallic or non-metallic nanoparticles change the thermal properties like thermal conductivity, viscosity, specific heat, and density of the base fluid. Past studies focused on measuring the thermal properties of nanofluids. These suspended nanoparticles effectively improve the transport properties and heat transfer characteristics of the base fluids. Recently, heat transfer augmentation using suspensions of nanometre-sized solid particles in base liquids have been investigated by various research groups across the world. This paper reviews the state-of-the-art nanofluid studies in the area of forced convection heat transfer enhancement. The results for the heat transfer characteristics in internal flow with constant heat flux and constant wall temperature boundary conditions reported by various researchers have been compiled and reviewed. Further, in heat exchangers, the real boundary conditions are different from the constant heat flux and constant wall temperature boundary conditions. Over a span of 2 decades, the literature in this field is widespread; hence, this review would be useful for researchers to have a precise screening of a wide range of investigations in this area.

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Experimental study of convective heat transfer and pressure drop of TiO2/water nanofluid

Cited by 167 publications

References 18 publications

A Review on Nanofluids: Fabrication, Stability, and Thermophysical Properties

A Review on Nanofluids: Fabrication, Stability, and Thermophysical Properties

Preparation Techniques of TiO2 Nanofluids and Challenges: A Review

A comprehensive review of experimental investigations of forced convective heat transfer characteristics for various nanofluids

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