A meta-analysis on the effects of haphazard motion of tiny/nano-sized particles on the dynamics and other physical properties of some fluids

Animasaun, Isaac Lare; Ibraheem, R.O.; Mahanthesh, B.; Babatunde, H.A.

doi:10.1016/j.cjph.2019.06.007

Cited by 140 publications

(43 citation statements)

References 50 publications

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“…is was observed by Animasaun et al [58] in detail. According to their hypothesis, the flow temperature is bound to increase with an increase in the Brownian motion in the flow.…”

Section: Analysis and Discussionsupporting

confidence: 56%

Fully Developed Flow of a Nanofluid through a Circular Micropipe in the Presence of Electroosmotic Effects

Niazi

2020

Mathematical Problems in Engineering

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Microscale heat sinks based on channels or pipes are designed to restrict the temperatures of microelectromechanical systems, which have a wide range of applications in the modern engineering and mechanics. In this context, this work aims to study heat convection and entropy generation of a fully developed nanofluid flow in a circular micropipe in the presence of an electrical double layer. Buongiorno’s model is employed to exhibit the nanofluid behavior. The governing equations are reduced to a system of nonlinear ordinary differential equations through appropriate similarity transformations. Particularly, we rectify the pressure term as an unknown constant, which makes our flow model compatible with those well-known fluid flow models in macrosize. Highly accurate solutions are obtained and verified. Analysis for physical properties of electric field, velocity field, temperature, and nanoparticle distributions is discussed followed by an investigation of the entropy evolution in the flow. The results show that flow behavior and total entropy of the system depend on the electroosmosis, thermophoresis, and fluid viscosity. However, the influence of the electrical double layer on the flow and system entropy is negligible when the electroosmotic parameter exceeds a maximum value.

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“…is was observed by Animasaun et al [58] in detail. According to their hypothesis, the flow temperature is bound to increase with an increase in the Brownian motion in the flow.…”

Section: Analysis and Discussionsupporting

confidence: 56%

Fully Developed Flow of a Nanofluid through a Circular Micropipe in the Presence of Electroosmotic Effects

Niazi

2020

Mathematical Problems in Engineering

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“…These data are considered reasonably high for nanoporous silica-titania materials [14]. Using the method of slope of linear regression through the data points suggested in [24][25][26], it is worth remarking that for PEG/SiO 2 , with an increase in the temperature, S BET increases at the rate of 0.309016393. Meanwhile, for PEG/ SiO 2 -TiO 2 , S BET increases with temperature at the rate of 0.69192459.…”

Section: Resultsmentioning

confidence: 82%

Facile synthesis of SiO2–TiO2 photocatalyst nanoparticles for degradation of phenolic water pollutants

et al. 2019

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A facile synthesis of polyethylene glycol-templated silica-titania (PEG-templated SiO 2-TiO 2) nanoparticles has been carried out using sol-gel reactions by partial-prehydrolysis of tetraethoxysilane and titanium isopropoxide. The prepared nanomaterials have been investigated by N 2 adsorption, FTIR, FT-Raman, TG-DSC, XRD, TEM, DLS, 13 C and 29 Si MAS NMR and XPS analysis to characterize the phase composition and microstructure of the samples. The photocatalytic performance of the SiO 2-TiO 2 nanoparticles was evaluated by photooxidative degradation of the alkylphenol derivatives aqueous solution. It was shown that their photoactivity in the removal of alkylphenol ethoxylates from aqueous solution was higher than for porous titania nanoparticles. The incorporation of PEG template into the inorganic network with subsequent formation of nanoporous structure will increases the efficiency of the SiO 2-TiO 2 nanoparticles. It was shown that the polymeric species played a significant role in the generation of pores by the hybridization with inorganic oxides on the molecular scale due to hydrogen bonds taking place at the ether moieties. The advantages of including thermally removable PEG template in terms of increasing surface, mesoporosity and photon absorbance at UV-visible wavelengths to give nanoengineered photocatalytic materials is described.

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“…18a and 19a, which provide the lift coefficient for the entire RG15 airfoil family, as a function of the angle of attack. Additional information about the behaviour of (L∕D) max and C L max with Re can be obtained by observing Table 6, which presents the increase rate of (L∕D) max and C L max due to the increase of Re (i.e., the rate of change in (L∕D) max and C L max as Re changes) for each airfoil of the RG15 family, using the slope of the linear regression line through data points suggested in [37,38]. According to Table 6, Re has a higher impact on (L∕D) max , as the relative thickness of the airfoil increases.…”

Section: Xfoil Resultsmentioning

confidence: 99%

Low Reynolds airfoil family for small horizontal axis wind turbines based on RG15 airfoil

et al. 2020

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The present study introduces a low Reynolds number (Re) airfoil family for the entire blade span of small wind turbines, aiming to reduce the effects related to laminar separation, improve startup response and meet acceptable levels of structural integrity. Six airfoils of varying relative thickness were designed by increasing the thickness distribution of RG15 airfoil up to 50% and adopting a rounded trailing edge with a diameter equal to 1% of the chord length. The aerodynamic performance of RG15 family was initially evaluated by means of XFOIL code at several low Reynolds numbers ranging from 60,000 to 300,000 and angles of attack between − 6° and 14°. XFOIL analysis revealed that increasing relative thickness leads to the reduction of maximum lift-to-drag ratio (C L ∕C D ) . However, this percentage reduction decreases with increasing Re. The maximum reduction in maximum C L ∕C D was found at 60,000 Re for the thickest airfoil of RG15 family. Conversely, a growth of maximum lift coefficient (C L ) was observed by increasing relative thickness. Besides, a Reynolds-Averaged Navier-Stokes (RANS) analysis was also conducted at 300,000 Re to get additional information on the flow characteristics. Comparisons between the XFOIL and RANS data were performed. The results of RANS simulations were generally in accordance with those of XFOIL. However, notable over-estimations of drag coefficient (C D ) were detected. The behavior of the recirculation area behind the rounded trailing edge and that of the separation bubble near the leading edge for different values of relative thickness and angle of attack was examined. Thickening of the airfoils was found to have a beneficial impact on the appearance of separation bubbles, while no significant effect of the rounded trailing edge on C L and C D was observed.

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A meta-analysis on the effects of haphazard motion of tiny/nano-sized particles on the dynamics and other physical properties of some fluids

Cited by 140 publications

References 50 publications

Fully Developed Flow of a Nanofluid through a Circular Micropipe in the Presence of Electroosmotic Effects

Fully Developed Flow of a Nanofluid through a Circular Micropipe in the Presence of Electroosmotic Effects

Facile synthesis of SiO2–TiO2 photocatalyst nanoparticles for degradation of phenolic water pollutants

Low Reynolds airfoil family for small horizontal axis wind turbines based on RG15 airfoil

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