Hybrid nanofluid flow towards a stagnation point on a stretching/shrinking cylinder

Waini, Iskandar; Ishak, Anuar Mohd; Pop, Ioan

doi:10.1038/s41598-020-66126-2

Cited by 89 publications

(53 citation statements)

References 54 publications

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“…This finding upholds the assumption of the convective heat transfer system can be improved by optimizing the nanoparticle concentration when φ 2 increased. The results obtained in Figures 6 and 7 are consistent with Waini et al [20] and Zainal et al [21], whereby adding the concentrations of hybrid nanoparticles may contribute to the improvement of the heat transfer rate, accordingly. The temperature profile in Figure 9 describes the temperature variations when the conventional Al 2 O 3 -H 2 O nanofluid becomes the hybrid Al 2 O 3 -Cu/H 2 O nanofluid in both first and second solutions.…”

Section: Resultssupporting

confidence: 89%

“…The ground-breaking research in this topic was first initiated by Hiemenz [14] who exposed an analytical explanation of two-dimensional stagnation point flow, and soon after, Homann [15] conducted a classical study of stagnation point in three-dimensional flow with regard to an axisymmetric case; whereas Howarth [16] tackled the problem of non-axisymmetric flow close to the stagnation area in three-dimensional analysis. Recently, Khashi'ie et al [17,18], Fang and Wang [19], Waini et al [20], and Zainal et al [21] have scrutinized the stagnation point flow problems in diverse aspects with no-slip boundary conditions. Nevertheless, in numerous engineering occasions, the slip effect should be comprised, such as flow over lubricated or coated surfaces, rough or striated surfaces [22] and internal rare field gas flow [23].…”

Section: Introductionmentioning

confidence: 99%

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Unsteady Stagnation Point Flow of Hybrid Nanofluid Past a Convectively Heated Stretching/Shrinking Sheet with Velocity Slip

2020

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Unsteady stagnation point flow in hybrid nanofluid (Al2O3-Cu/H2O) past a convectively heated stretching/shrinking sheet is examined. Apart from the conventional surface of the no-slip condition, the velocity slip condition is considered in this study. By incorporating verified similarity transformations, the differential equations together with their partial derivatives are changed into ordinary differential equations. Throughout the MATLAB operating system, the simplified mathematical model is clarified by employing the bvp4c procedure. The above-proposed approach is capable of producing non-uniqueness solutions when adequate initial assumptions are provided. The findings revealed that the skin friction coefficient intensifies in conjunction with the local Nusselt number by adding up the nanoparticles volume fraction. The occurrence of velocity slip at the boundary reduces the coefficient of skin friction; however, an upward trend is exemplified in the rate of heat transfer. The results also signified that, unlike the parameter of velocity slip, the increment in the unsteady parameter conclusively increases the coefficient of skin friction, and an upsurge attribution in the heat transfer rate is observed resulting from the increment of Biot number. The findings are evidenced to have dual solutions, which inevitably contribute to stability analysis, hence validating the feasibility of the first solution.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Unsteady Stagnation Point Flow of Hybrid Nanofluid Past a Convectively Heated Stretching/Shrinking Sheet with Velocity Slip

2020

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“…The addition of tiny particles to the base fluid is a well-known technique for thermal-characteristics improvement, that lead to enhancement in drag forces 38 . Additionally, some other types of nanoparticles used in hybrid nanofluid recently studied by Waini et al 39 – 42 for the enhancement of heat transfer. It is also discovered that 5% volume fraction of nanoparticles in base fluid is more effective for the maximum heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Hybrid nanofluid flow within the conical gap between the cone and the surface of a rotating disk

Gul

Kashifullah

Bilal

et al. 2021

Sci Rep

116

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The thermal management of the flow of the hybrid nanofluid within the conical gap between a cone and a disk is analyzed. Four different cases of flow are examined, including (1) stationary cone rotating disk (2) rotating cone stationary disk (3) rotating cone and disk in the same direction and (4) rotating cone and disk in the opposite directions. The magnetic field of strength $$B_{0}$$ B 0 is added to the modeled problem that is applied along the z-direction. This work actually explores the role of the heat transfer, which performs in a plate-cone viscometer. A special type of hybrid nanoliquid containing copper Cu and magnetic ferrite Fe3O4 nanoparticles are considered. The similarity transformations have been used to alter the modeled from partial differential equations (PDEs) to the ordinary differential equations (ODEs). The modeled problem is analytically treated with the Homotopy analysis method HAM and the numerical ND-solve method has been used for the comparison. The numerical outputs for the temperature gradient are tabulated against physical pertinent variables. In particular, it is concluded that increment in volume fraction of both nanoparticles $$\left( {\phi_{{Fe_{3} O_{4} }} ,\phi_{Cu} } \right)$$ ϕ F e 3 O 4 , ϕ Cu effectively enhanced the thermal transmission rate and velocity of base fluid. The desired cooling of disk-cone instruments can be gained for a rotating disk with a fixed cone, while the surface temperature remains constant.

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“…The dimensionless form of flow field equations is obtained by utilizing (11) and it is given as follows…”

Section: Mathematical Formulationmentioning

confidence: 99%

Theoretical study of unsteady oblique stagnation point based Jeffrey nanofluid flow over an oscillatory stretching sheet

Awan

Abid

Abbas

2020

Advances in Mechanical Engineering

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The numerical analysis for two-dimensional oblique stagnation point flow with the magnetohydrodynamic effects of an incompressible unsteady Jeffrey fluid model caused by an oscillatory and stretching sheet has been presented in this article. The Brownian motion and thermophoresis impacts are taken into consideration. The similarity transformation technique is implemented on the governing partial differential equations of the Jeffrey fluid model to obtain a set of nonlinear coupled ordinary differential equations and then these resulting equations are numerically computed with the help of BVP-Maple programming. The variation in the behavior of velocity, temperature, and concentration profile influenced by the governing parameters, has been explicitly explored and displayed through graphs. The numerical results are highlighted in tabular form and through these outcomes, the skin friction coefficient, Nusselt number, and Sherwood number have been investigated. These physical quantities rise for gradually increasing the Hartmann number and ratio of relaxation to retardation time. However, these reduce for gradually growing Jeffrey fluid parameter.

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Hybrid nanofluid flow towards a stagnation point on a stretching/shrinking cylinder

Cited by 89 publications

References 54 publications

Unsteady Stagnation Point Flow of Hybrid Nanofluid Past a Convectively Heated Stretching/Shrinking Sheet with Velocity Slip

Unsteady Stagnation Point Flow of Hybrid Nanofluid Past a Convectively Heated Stretching/Shrinking Sheet with Velocity Slip

Hybrid nanofluid flow within the conical gap between the cone and the surface of a rotating disk

Theoretical study of unsteady oblique stagnation point based Jeffrey nanofluid flow over an oscillatory stretching sheet

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