Experimental Investigation on Surface Tension of Water-Based Graphene Oxide Nanofluids

2014 ◽  
Vol 1082 ◽  
pp. 297-301 ◽  
Author(s):  
Zhao Zhi Zheng
Keyword(s):  
Surface Tension ◽  
Experimental Investigation ◽  
Graphene Oxide ◽  
Mass Fraction ◽  
Deionized Water ◽  
Nanoparticle Size ◽  
Refrigeration Cycle ◽  
Absorption Refrigeration ◽  
Water Based ◽  
Increasing Temperature

The water-based graphene oxide nanofluids were prepared. The surface tension of nanofluids with different mass fraction, temperature and different nanoparticle size was researched. The surface tension value was measured through ringmethod. The experimental results show that the surface tension of nanofluids is increased with increasing the mass faction of nanoparticles. But the surface tension of nanofluids with maximum concentration (0.1 wt %) is only increased up to 2.9% compared with deionized water. The surface tension of nanofluids decreases with increasing temperature and decreasing nanoparticle size. The results of this paper may provide reference for the research of absorption liquid for absorption refrigeration cycle.

Experimental Investigation on Viscosities of Cu-H2O Nanofluids

2014 ◽  
Vol 1082 ◽  
pp. 293-296 ◽  
Author(s):  
Zhao Zhi Zheng
Keyword(s):  
Experimental Investigation ◽  
Mass Fraction ◽  
Deionized Water ◽  
Newtonian Fluids ◽  
Experimental Results ◽  
Nanoparticle Size ◽  
Increasing Temperature

In this study, Cu-H2O nanofluids with different mass fraction and nanoparticle size were prepared by supersonic oscillator through appending hydrophilic dispersant into deionized water. The viscosities of Cu-H2O nanofluids and H2O were investigated experimentally under different temperature. The experimental results show that the viscosities of nanofluids increase apparently compared to the deionized water, and increases with increasing nanoparticle size, mass fraction. What’s more, the viscosity of nanofluids decreases with increasing temperature. The results also demonstrated that the Cu-H2O nanofluids are Newtonian fluids.

Experimental Investigation on Photothermal Properties of MWCNT-H2O Nanofluids for Direct Absorption Solar Collectors

2014 ◽  
Vol 521 ◽  
pp. 19-22
Author(s):  
Qin Bo He
Keyword(s):  
Experimental Investigation ◽  
Solar Radiation ◽  
Mass Fraction ◽  
Solar Spectrum ◽  
Energy Systems ◽  
Deionized Water ◽  
Integrating Sphere ◽  
Direct Absorption ◽  
Solar Thermal Energy ◽  
Heat Gain

Optical and photothermal properties of MWCNT-H2O nanofluids were investigated in the present work. The transmittance of nanofluids over solar spectrum (250 to 2500nm) was measured by the UV-Vis-NIR spectrophotometer based on integrating sphere principle. The photothermal properties of nanofluids were studied expose to the solar radiation. The experimental results show that the transmittance of MWCNT-H2O nanofluids is much less than that of deionized water, and decreases with increasing nanoparticle mass fraction. The highest temperature and heat gain of MWCNT-H2O nanofluids (0.02wt%) can increased up to 31.87% and 54.14% compared with deionized water, respectively. From the results it can be concluded that MWCNT-H2O nanofluids is suitable for direct absorption solar thermal energy systems.

Characterization of Temperature Dependence of Interfacial Tension and Viscosity of Nanofluid

2008 ◽  
Author(s):  
S. M. Sohel Murshed ◽  
Nam-Trung Nguyen
Keyword(s):  
Surface Tension ◽  
Interfacial Tension ◽  
Temperature Dependence ◽  
Base Fluid ◽  
Deionized Water ◽  
Fluid Temperature ◽  
Interfacial Tensions ◽  
Increasing Temperature ◽  
Reduced Surface

Investigations on temperature dependence of surface tension, interfacial tension and viscosity a nanofluid are reported in this paper. Experimental results show that nanofluid having TiO2 nanoparticles (15 nm) in deionized water exhibit substantially smaller surface tension and oil-based interfacial tension than those of the base fluid (i.e. deionized water). These surface and interfacial tensions of this nanofluid were found to decrease almost linearly with increasing temperature. The Brownian motion of nanoparticles in base fluid was identified as a possible mechanism for reduced surface and interfacial tensions of nanofluid. The measured effective viscosity of nanofluid was found to be insignificantly higher than that of base fluid and it also decreases with increasing fluid temperature.

Artificial Neural Network Applied to Predicting the Surface Tension of Acoustically Levitated Droplets of Supercooling Nanofluids

NANO ◽  
2021 ◽  
pp. 2150108
Author(s):  
Baohui Wu ◽  
Yudong LIU ◽  
Dengshi Wang ◽  
Nan Jiang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Neural Network ◽  
Experimental Data ◽  
Surface Tension ◽  
Artificial Neural Network ◽  
Graphene Oxide ◽  
Network Model ◽  
Neural Network Model ◽  
Artificial Neural Network Model ◽  
Deionized Water ◽  
Artificial Neural

Droplet oscillation method is a noncontact experimental approach, which can be used to measure the surface tension of acoustically levitated droplet. In this paper, we obtained huge amounts of experimental data of deionized water and water-based graphene oxide nanofluids within the temperature range of [Formula: see text]8.2–[Formula: see text]C. Based on the experimental data, we analyzed the influence of droplet’s deformation and frequency shift phenomenon on the surface tension of levitated droplet. Eight parameters that strongly correlate with surface tension were found and used as input neurons of artificial neural network model to predict the surface tension of supercooling graphene oxide nanofluids. The experimental data of nonsupercooling graphene oxide nanofluids were used as training set to optimize artificial neural network model, and that of deionized water were served as validation set, which was used to verify the predictive ability of artificial neural network model. The root mean square error of the optimized artificial neural network model to validation set is only 0.2558[Formula: see text]mN/m, and the prediction values of the surface tension of supercooling deionized water were in good agreement with the theoretical values calculated by Vargaftik equation, which indicates that artificial neural network model can deal well with the complex nonlinear relationship. Afterwards, we successfully predicted the surface tension of supercooling nanofluids by means of the optimized artificial neural network model and obviously reduced the dispersion and deviation caused by droplet deformation and other problems during oscillation process.

Study on Dispersion and Rheology of Particles in Water-Based Nano TiN Fluid

2015 ◽  
Vol 1095 ◽  
pp. 53-57
Author(s):  
Xin Wang Ouyang ◽  
Zhang Yong Wu ◽  
Zi Yong Mo
Keyword(s):  
Rheological Properties ◽  
Dispersion Medium ◽  
Mass Fraction ◽  
Deionized Water ◽  
Dispersion Effect ◽  
Step Method ◽  
Sedimentation Stability ◽  
Preparation Conditions ◽  
Water Based

The water-based nanoTiN fluids were prepared by nanoTiN particles, dispersion medium and dispersant using a two-step method. The dispersion and rheology of nanoparticles in water-based fluid were studied under different preparation conditions. The dispersion and rheology of prepared nanoTiN fluids were evaluated and analyzed from the mass fraction of nanoparticles, mass fraction of dispersant and type of dispersion medium respectively by using the analysis of sedimentation stability and rheological properties. The results show that the above-mentioned factors all have different degree of influence on nanofluids’ dispersion and rheology. The viscosity of nanofluids increases with mass fraction of nanoparticles. A balance amount of mass fraction of dispersant will improve nanofluids’ dispersity and fluidity. The dispersion effect of deionized water is the best when the nanoparticles dispersed in different dispersion medium.

An Experimental Investigation of Properties of Nanofluid and Its Performance on Thermosyphon Cooled by Natural Convection

2019 ◽  
Vol 11 (4) ◽  
Author(s):  
Sidhartha Das ◽  
Asis Giri ◽  
S. Samanta ◽  
S. Kanagaraj
Keyword(s):  
Thermal Conductivity ◽  
Surface Tension ◽  
Contact Angle ◽  
Experimental Investigation ◽  
Natural Convection ◽  
Thermal Resistance ◽  
Al2o3 Nanoparticles ◽  
Water Based ◽  
Lower Heat ◽  
Al2o3 Nanofluid

An attempt is made here to characterize thermal conductivity of water-based Al2O3 nanofluid and then use the same in a circular finned thermosyphon (TPCT) to measure its thermal performance. The concentration of Al2O3 nanofluid is varied within 0.05–0.25% by volume. The thermal conductivity of nanofluid is increased with concentration of Al2O3 nanoparticles as well as with temperature. A maximum of 26.7% enhancement of thermal conductivity is observed at 45 °C for 0.25% concentration by volume of nanofluid in comparison to that of de-ionized (DI) water. Variations of surface tension and contact angle of Al2O3 nanofluid are also compared with DI water. One of the smallest TPCT with different heat inputs (4 W, 8 W, and 12 W) and different inclinations (30 deg, 45 deg, 60 deg, and 90 deg) is tested for different concentration of Al2O3 nanofluid, which will find application in smaller electronic units. It is found that use of nanofluid decreases the wall temperature distribution of TPCT. Thermal resistance of TPCT decreases whenever TPCT is filled with nanofluid and a maximum of 36.4% reduction in thermal resistance is noted for 0.25% volume of nanoparticles at 4 W with an inclination of 60 deg. It is also found that performance of TPCT is higher at 60 deg inclination compared to other inclinations, especially for lower heat input.

Experimental Investigation on Nucleation Supercooling Degree of TiO2–H2O Nanofluids for Cool Storage

2012 ◽  
Vol 550-553 ◽  
pp. 2723-2727 ◽  
Author(s):  
Qin Bo He ◽  
Shequan Zeng ◽  
Shaoyou Yin ◽  
Shuang Feng Wang
Keyword(s):  
Experimental Investigation ◽  
Mass Fraction ◽  
Deionized Water ◽  
Experimental Results ◽  
Freezing Time ◽  
Cooling Temperature ◽  
Cool Storage ◽  
Supercooling Degree ◽  
The Impact

This paper presents a study on the impact of the nucleation supercooling degree of nanofluids. Three different mass fraction TiO2-H2O nanofluids with 20nm TiO2were prepared by supersonic oscillator through appending hydrophilic dispersant into deionized water. TiO2-H2O nanofluids and deionized water were tested by the experiments of freezing synchronous. The experimental results show that nanofluids have remarkably lower supercooling degree than deionized water, and the time of beginning nucleation is ahead of deionized water, also the total freezing time is lower than that of deionized water. And the influences of different cooling temperature to the supercooling degree were observed, with the cooling temperature increasing, the supercooling degree reduced.

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