Experimental Study on Thermal Conductivity and Viscosity of Water-Based Nanofluids

Tavman, İsmail; Turgut, Alpaslan; Chirtoc, M.; Hadjov, Kliment; Fudym, Olivier; Tavman, Şebnem

doi:10.1615/heattransres.v41.i3.100

Cited by 24 publications

(4 citation statements)

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“…Desired weight concentration of silica-water and aluminium oxide nanofluids were prepared by mixing appropriate quantities of nanoparticles with the base fluid and were sonicated by an ultrasonic bath for at least 30 minutes. [40] All nonfluids were stable for a long time and the experimental tests were done without any visible settlement. The bubble should be visible in the nanofluid, so the nanofluids were prepared at low concentrations.…”

Section: Methodsmentioning

confidence: 99%

Different nanofluids effect on bubble characteristics at the isothermal bubble column

et al. 2021

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In this study, the effect of different nanofluids such as SiO 2 , Fe 3 O 4 , and Al 2 O 3 on bubble characteristics is studied experimentally. The nanoparticles concentration for the SiO 2 nanofluid is 0.05 wt% and for other nanofluids is 0.005 wt%. Bubbles are formed by injection of air at a constant gas flow rate (between 600-1200 mL/h) into a stagnant isothermal liquid column. Experimental data of formation, growth, and detachment of the air bubbles were recorded by a high-speed digital camera (1200 fps), and the image processing method was used to analyze the bubble characteristics. In the present study, bubble characteristics such as diameter, size, aspect ratio, and detachment frequency were studied in four different liquids. The results show that a bubble has the biggest size in the pure water and adding nanoparticles to the pure water decreases bubble size. Also, the variation of detachment frequency has an inverse relation with the bubble size behaviour. Between different nanoparticles, Fe 3 O 4 has maximum and SiO 2 has minimum effect on bubble features. By adding Fe 3 O 4 to pure water , bubble diameter decreases nearly 7%-8% and bubble detachment frequency increases nearly 15%-20%. In order to analyze the variation of the bubble characteristics, a force modelling on bubbles during the growth was proposed. Moreover, a correlation has been proposed for the prediction of bubble diameter at detachment time in three different nanofluids and in the pure water. The mean absolute error of this correlation is 2.65% and has a good agreement with experimental results.

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Section: Methodsmentioning

confidence: 99%

Different nanofluids effect on bubble characteristics at the isothermal bubble column

et al. 2021

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“…Figure 11 shows these results for the decrease in particle size as a function of sonication time. Tavman et al [62] observed that the thermal conductivity of TiO 2 nanofluids was increased by increasing the concentration of the nanoparticles in the base fluid. They prepared three samples of TiO 2 nanofluids by dispersing the nanoparticles with concentrations of 0.2, 1.0, 2.0 vol.…”

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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“…Most studies performed about nanofluids have pointed out a noticeable increase of their thermal conductivity compared to conventional fluids [46]. This feature results in higher heat transfer coefficients [47] enabling the use of less coolant flows [48].…”

Section: Thermal Management In Icesmentioning

confidence: 99%

“…46 presents the terminal voltage of the cylindrical cell (N1) and its surface temperature during the cycle. It can be observed that the model accurately predicts the voltage and temperature of the cell.…”

mentioning

confidence: 99%

Development of Integrated Models for Thermal Management in Hybrid Vehicles

Bennany¹

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Almighty, for giving me my life, guiding me into goodness, and surrounding me with great, caring, and knowledgeable people during the elaboration of my Ph.D. Thesis.Special gratitude to my beloved family; my parents Khalid and Zohra, my dear brothers Achraf and Miloud, and my beloved wife Hind.Special mention deserves my supervisor and friend Dr. Pablo César Olmeda González for his mentoring, support, guidance, and patience during the last years.My gratitude also to the professors who were directly or indirectly

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Experimental Study on Thermal Conductivity and Viscosity of Water-Based Nanofluids

Cited by 24 publications

References 0 publications

Different nanofluids effect on bubble characteristics at the isothermal bubble column

Different nanofluids effect on bubble characteristics at the isothermal bubble column

Preparation Techniques of TiO2 Nanofluids and Challenges: A Review

Development of Integrated Models for Thermal Management in Hybrid Vehicles

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