Physicochemical and rheological properties of titania and carbon nanotubes in a channel with changing walls

Raza, Jawad; Rohni, Azizah Mohd; Omar, Zurni; Awais, Muhammad; Baig, Ajmal

doi:10.1108/mmms-07-2016-0028

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…Titanium dioxide (TiO 2 ) is found in nature in many different structures and crystalline forms such as monoclinic, orthorhombic, tetragonal, cubic, etc. (Landmann et al ., 2012; Zhao et al ., 2008; Dash et al ., 2018; Yan et al ., 2013; Raza et al ., 2016). Interestingly, it provides many utilization ways (Landmann et al ., 2012) in tetragonal form.…”

Section: Introductionmentioning

confidence: 99%

Structural, electronic, and mechanical properties of anatase titanium dioxide

Dash

Pandey

Chaudhary

et al. 2019

MMMS

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Purpose The purpose of this paper is to analyze various properties of anatase titanium dioxide (TiO2) nanoparticles. Further, it proposes to implement Linear Combinations of Atomic Orbitals (LCAO) basis set under the framework of density functional theory and outline how LCAO is able to provide improved results in terms of various mechanical properties rather than plane wave and other theoretical results. Design/methodology/approach This paper provides an exploratory study on anatase TiO2 by implementing OLCAO–DFT–LDA–LBFGS–EOS–PZ algorithms to find out various ground-level properties. The data so obtained are complemented by various analysis using mathematical expressions, description of internal processes occurred and comparison to others’ analytical results. Findings The paper provides some empirical insights on how mechanical properties of anatase TiO2 improved by implementing LCAO methodology. From the analysis of electronic properties, it is seen that the anatase TiO2 supports the inter band indirect transition from O-2p in valence region to Ti-3d in the conduction region. Research limitations/implications Most of the electronic properties are underestimated because a single exchange-correlation potential is not continuous across the gap. This gap can be enhanced by implementing Green’s function in place of DFT and the other way is to implement self-interaction correction. Practical implications The use of anatase TiO2 is primarily used for catalytic applications. This is also used to enhance the quality of paper in the paper industry. Additionally, this is used as a prime ingredient in cosmetic industry. Originality/value This paper fulfills an identified need to study how LCAO, another basis set, plays an important role in improving material properties.

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Section: Introductionmentioning

confidence: 99%

Structural, electronic, and mechanical properties of anatase titanium dioxide

Dash

Pandey

Chaudhary

et al. 2019

MMMS

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“…As of late, Singh et al [18] utilized Runge-Kutta-Fehlberg strategy with shooting technique to take care of the issue of an MHD flimsy nanofluid stream between parallel plates with slip impacts. Raza et al [19][20][21][22][23] effectively tackled the fluid problems in a channel with shooting strategy under the various physical conditions. Hatami et al [24] researched the flow of nanofluid between expanding or contracting discs.…”

Section: Introductionmentioning

confidence: 99%

MHD Slip Flow of Cu-Kerosene Nanofluid in a Channel with Stretching Walls Using 3-Stage Lobatto IIIA Formula

Reza

Mebarek‐Oudina

Makinde

2018

DDF

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In this paper, rheology of laminar incompressible Copper-Kerosene nanofluid in a channel with stretching walls under the influence of transverse magnetic field is investigated. The main structure of the partial differential equations was taken from the law of conservation of mass, momentum and energy equations. Governing boundary layer equations are transformed into nonlinear ordinary differential equations by using similarity variables and then solved with 3-stage Lobatto IIIA formula. Numerical results were compared with another numerical method (Runge-Kutta-Fehlberg) and found excellent agreement. The influence of physical parameters Reynolds number, magnetic number, solid volume fraction, momentum and thermal slip parameters on velocity and temperature profile considered. Numerical results revealed that solid volume fraction decreases the velocity of nanofluid particles near the lower wall of the channel and increase the thermal boundary layer thickness in the channel.

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“…Recently, Singh et al (2016) used Runge-Kutta-Fehlberg method with shooting method to solve the problem of MHD unsteady nanofluid flow between parallel plates with slip effects. Raza et al (2016aRaza et al ( , b, c, 2017 and Raza, Rohni, Omar and Baig (2016) successfully solved the fluid flow problems in a channel with shooting method. Volume finite method was used by Mebarek-Oudina (Mebarek-Oudina and Bessaïh, 2007Mebarek-Oudina, 2017) to solve numerically the differential equations of the fluid problem.…”

mentioning

confidence: 99%

Magnetohydrodynamic flow of molybdenum disulfide nanofluid in a channel with shape effects

Raza

Mebarek‐Oudina

Chamkha

2019

MMMS

Self Cite

159

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Purpose The purpose of this paper is to examine the combined effects of thermal radiation and magnetic field of molybdenum disulfide nanofluid in a channel with changing walls. Water is considered as a Newtonian fluid and treated as a base fluid and MoS2 as nanoparticles with different shapes (spherical, cylindrical and laminar). The main structures of partial differential equations are taken in the form of continuity, momentum and energy equations. Design/methodology/approach The governing partial differential equations are converted into a set of nonlinear ordinary differential equations by applying a suitable similarity transformation and then solved numerically via a three-stage Lobatto III-A formula. Findings All obtained unknown functions are discussed in detail after plotting the numerical results against different arising physical parameters. The validations of numerical results have been taken into account with other works reported in literature and are found to be in an excellent agreement. The study reveals that the Nusselt number increases by increasing the solid volume fraction for different shapes of nanoparticles, and an increase in the values of wall expansion ratio α increases the velocity profile f′(η) from lower wall to the center of the channel and decreases afterwards. Originality/value In this paper, a numerical method was utilized to investigate the influence of molybdenum disulfide (MoS2) nanoparticles shapes on MHD flow of nanofluid in a channel. The validity of the literature review cited above ensures that the current study has never been reported before and it is quite new; therefore, in case of validity of the results, a three-stage Lobattoo III-A formula is implemented in Matlab 15 by built in routine “bvp4c,” and it is found to be in an excellent agreement with the literature published before.

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Physicochemical and rheological properties of titania and carbon nanotubes in a channel with changing walls

Cited by 4 publications

References 32 publications

Structural, electronic, and mechanical properties of anatase titanium dioxide

Structural, electronic, and mechanical properties of anatase titanium dioxide

MHD Slip Flow of Cu-Kerosene Nanofluid in a Channel with Stretching Walls Using 3-Stage Lobatto IIIA Formula

Magnetohydrodynamic flow of molybdenum disulfide nanofluid in a channel with shape effects

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