Experimental investigation on thermo-physical properties of metal oxide composite nanolubricants

Zawawi, Nurul Nadia Mohd; Azmi, W.H.; Redhwan, A. A. M.; Sharif, M. Z.; Samykano, M.

doi:10.1016/j.ijrefrig.2018.01.015

Cited by 81 publications

(27 citation statements)

References 40 publications

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“…In addition, the relative viscosity of MWCNT-Fe 2 O 3 /DIW nanofluids was noticed to increase as the temperature increased. The observed trend agreed with the data published by Nadooshan et al [ 34 ] (Fe 3 O 4 -MWCNT/EG nanofluid), Adio et al [ 45 ] (Al 2 O 3 -glycerol nanofluid), and Zawawi et al [ 56 ] (hybrid nanofluids). However, Dardan et al [ 26 ] reported the reverse of the trend noticed in the present work, as the relative viscosity of Al 2 O 3 -MWCNT/EO nanofluid was reduced with temperatures at 35–50 °C, for measurements spanning 25–50 °C.…”

Section: Resultssupporting

confidence: 91%

Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3

et al. 2021

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The superiority of nanofluid over conventional working fluid has been well researched and proven. Newest on the horizon is the hybrid nanofluid currently being examined due to its improved thermal properties. This paper examined the viscosity and electrical conductivity of deionized water (DIW)-based multiwalled carbon nanotube (MWCNT)-Fe2O3 (20:80) nanofluids at temperatures and volume concentrations ranging from 15 °C to 55 °C and 0.1–1.5%, respectively. The morphology of the suspended hybrid nanofluids was characterized using a transmission electron microscope, and the stability was monitored using visual inspection, UV–visible, and viscosity-checking techniques. With the aid of a viscometer and electrical conductivity meter, the viscosity and electrical conductivity of the hybrid nanofluids were determined, respectively. The MWCNT-Fe2O3/DIW nanofluids were found to be stable and well suspended. Both the electrical conductivity and viscosity of the hybrid nanofluids were augmented with respect to increasing volume concentration. In contrast, the temperature rise was noticed to diminish the viscosity of the nanofluids, but it enhanced electrical conductivity. Maximum increments of 35.7% and 1676.4% were obtained for the viscosity and electrical conductivity of the hybrid nanofluids, respectively, when compared with the base fluid. The obtained results were observed to agree with previous studies in the literature. After fitting the obtained experimental data, high accuracy was achieved with the formulated correlations for estimating the electrical conductivity and viscosity. The examined hybrid nanofluid was noticed to possess a lesser viscosity in comparison with the mono-particle nanofluid of Fe2O3/water, which was good for engineering applications as the pumping power would be reduced.

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Section: Resultssupporting

confidence: 91%

Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3

et al. 2021

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“…Again, progress in research has shown that the hybridization of NP could be utilized to manipulate the viscosity of NF. The viscosity of HNF has been investigated by numerous researchers as regards temperature, volume/mass concentration or fraction and mixing ratio of HNP [ 47 , 48 , 63 , 66 , 69 , 70 , 72 , 100 , 104 , 117 , 118 ]. Similarly to NF, the viscosity of HNF enhanced with volume/mass concentration or fraction and detracted with temperature.…”

Section: Thermophysical Properties Of Nanofluids and Hybrid-nanoflmentioning

confidence: 99%

“…Few studies have been published regarding the influence of magnetic field on NF and HNF and viscosity was observed to enhance as the magnetic field intensity increased [ 76 , 97 , 99 , 103 , 119 , 120 , 121 ]. Experimental data of viscosity of NF and HNF at various temperatures and volume/mass concentrations or fractions have been fitted into models for the estimation of viscosity [ 47 , 72 , 100 , 104 , 110 , 116 , 118 , 120 , 122 ]. These models are useful in the design of thermal systems for engineering and processing applications.…”

Section: Thermophysical Properties Of Nanofluids and Hybrid-nanoflmentioning

confidence: 99%

Experimental Research and Development on the Natural Convection of Suspensions of Nanoparticles—A Comprehensive Review

et al. 2020

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Suspensions of nanoparticles, widely known as nanofluids, are considered as advanced heat transfer media for thermal management and conversion systems. Research on their convective thermal transport is of paramount importance for their applications in such systems such as heat exchangers and solar collectors. This paper presents experimental research on the natural convection heat transfer performances of nanofluids in different geometries from thermal management and conversion perspectives. Experimental results and available experiment-derived correlations for the natural thermal convection of nanofluids are critically analyzed. Other features such as nanofluid preparation, stability evaluation and thermophysical properties of nanofluids that are important for this thermal transfer feature are also briefly reviewed and discussed. Additionally, techniques (active and passive) employed for enhancing the thermo-convection of nanofluids in different geometries are highlighted and discussed. Hybrid nanofluids are featured in this work as the newest class of nanofluids, with particular focuses on the thermophysical properties and natural convection heat transfer performance in enclosures. It is demonstrated that there has been a lack of accurate stability evaluation given the inconsistencies of available results on these properties and features of nanofluids. Although nanofluids exhibit enhanced thermophysical properties such as viscosity and thermal conductivity, convective heat transfer coefficients were observed to deteriorate in some cases when nanofluids were used, especially for nanoparticle concentrations of more than 0.1 vol.%. However, there are inconsistencies in the literature results, and the underlying mechanisms are also not yet well-understood despite their great importance for practical applications.

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“…N.N.M. Zawawi et al (2018) [2] has done experimentations on viscosity and thermal conductivity on different nano composite lubricants with addition of 0.02% and temperatures range of 30 to 80 o C. The obtained enhancement ratio for Al2O3-SiO2/PAG based is about 0.68% to 1.035%. The viscosity is the order of 1.012 to 9.79%.…”

Section: Introductionmentioning

confidence: 99%

Development of Renewable Energy through Heat Enhancement for Lubricants by Adding Nano Materials

Koppula¹,

Tjprc²

2019

IJMPERD

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Industrial machines' efficiency mostly depends on its crucial components performance in many naval applications such as hydro plants, ships, vehicles and power generation stations etc., depending on reliability and safety. It is easy to reduce various impacts by changing the way and category of lubricants being used. Selection of the proper lubricant (s) is an art, and it sharply minimizes long-term costs as well performance of components. This analysis was focused about thermal conductivity (k) for Nano fluids of Fly Ash, SiO2, Al2O3 and a biological material (material is extracted from plants and the same is used by our ancients in various applications as lubricant additive). The nano particles' size and characteristics were measured by electron microscope scanning (SEM). The maintenance activities for several cases also have considerable environmental impact, and they must have environment friendly approach. Proper selection of well suited base stocks as well additives reduces environmental impact. The paper presents 3 different types of lubricants and they are used to examine their thermal properties, which greatly effects on performance of components. Synthetic oil, SAE 0W-20 is experimentally and analytically examined for several configurations, and data collected is calculated and compared. This analysis can provide the information and assists in the selection correct lubricant additive with minimized environmental effects. Extensive research revealed that heat transfer capacity for materials depended on thermal conductivity (k). And, an advanced technology facilitated nano fluids' usage for further improvement in thermal conductivity.

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Experimental investigation on thermo-physical properties of metal oxide composite nanolubricants

Cited by 81 publications

References 40 publications

Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3

Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3

Experimental Research and Development on the Natural Convection of Suspensions of Nanoparticles—A Comprehensive Review

Development of Renewable Energy through Heat Enhancement for Lubricants by Adding Nano Materials

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