Mixed convective flow of a hybrid nanofluid between two parallel inclined plates under wall-slip condition

Nanofluids occupy a large place in many fields of technology due its improved heat transfer and pressure drop characteristics. Very recently, a new type of nanofluid, known as hybrid nanofluid, which consists of a mixture of two different nanoparticles suspended in the base fluid has been found to be the most emerging heat transfer fluid. It is well also established that entrance region effect enhances heat transfer rate. The present study deals with numerical investigations of the hydrodynamic behavior of the laminar mixed convective flow of a hybrid nanofluid in the entrance region of a horizontal annulus. A thermal boundary condition of uniform heat flux at the inner wall and an adiabatic outer wall is selected. The SIMPLER numerical algorithm is adopted in the present study. The hybrid nanofluid consists of water as base fluid and Ag-TiO2 as nanoparticles. The ratio of Ag to TiO2 is maintained as 1:3. The objective of the current study is mainly to analyze the hydrodynamic behavior hybrid nanofluid in the entrance region. The investigation reveals that the effect of the secondary flow due to the buoyancy forces is more intense in the upper part of the annular cross-section. It increases throughout the cross-section until its intensity reaches a maximum and then it becomes weak far downstream. The development of axial flow and temperature field is strongly influenced by the buoyancy forces.

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Entropy generation minimization (EGM) in nonlinear mixed convective flow of nanomaterial with Joule heating and slip condition

Journal of Molecular Liquids ◽

10.1016/j.molliq.2018.02.012 ◽

2018 ◽

Vol 256 ◽

pp. 108-120 ◽

Cited By ~ 68

Author(s):

Muhammad Ijaz Khan ◽

T. Hayat ◽

M. Waqas ◽

Muhammad Imran Khan ◽

A. Alsaedi

Keyword(s):

Entropy Generation ◽

Joule Heating ◽

Convective Flow ◽

Slip Condition ◽

Entropy Generation Minimization ◽

Mixed Convective Flow

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Mixed convective flow and heat transfer of hybrid nanofluid impinging obliquely on a vertical cylinder

International Journal of Ambient Energy ◽

10.1080/01430750.2021.1888800 ◽

2021 ◽

pp. 1-13

Author(s):

Aamar Abbasi ◽

Waseh Farooq ◽

F. Mabood

Keyword(s):

Heat Transfer ◽

Convective Flow ◽

Vertical Cylinder ◽

Hybrid Nanofluid ◽

Flow And Heat Transfer ◽

Mixed Convective Flow

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Mathematical Analysis of Thermal Energy Distribution in a Hybridized Mixed Convective Flow

Journal of Nanofluids ◽

10.1166/jon.2021.1778 ◽

2021 ◽

Vol 10 (2) ◽

pp. 222-231

Author(s):

Shafiq Ahmad ◽

Sohail Nadeem ◽

Aysha Rehman

Keyword(s):

Convective Flow ◽

Volume Fraction ◽

Variable Viscosity ◽

Solid Volume Fraction ◽

Momentum Equation ◽

Hybrid Nanofluid ◽

Governing Equations ◽

Porosity Parameter ◽

Heat Transfer Phenomenon ◽

Mixed Convective Flow

The mixed convective flow of hybrid nanofluid (SWCNT-MWCNT/EG) containing micropolar fluid past a Riga surface embedded in porous medium is explored in detail throughout this study. In the momentum equation, the Darcy Forchheimer effect is used. The heat transfer phenomenon is exploited with viscous dissipation and thermal stratification over a non-Fourier heat flux model. PDEs are transformed into the necessary governing equations using transformations. The numerical results of non-linear governing equations are collected using Matlab function bvp4c. Graphical representations of the effects of relevant parameters on velocity, skin friction, and temperature are shown. The comparison of simple nanofluid and hybrid nanofluid is discussed in graphs. The temperature field is higher for hybrid nanofluid than simple nanofluid when solid volume fraction enhances. With increasing solid volume fraction, porosity parameter, and mixed convection parameter, the axial friction factor rises. The momentum boundary layer is inversely proportional to the slip parameter, Hartman number, variable viscosity and the porosity parameter.

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Entropy Optimization in Nonlinear Mixed Convective Flow of Nanomaterials Through Porous Space

Journal of Non-Equilibrium Thermodynamics ◽

10.1515/jnet-2019-0048 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Tasawar Hayat ◽

Ikram Ullah ◽

Ahmad Alsaedi ◽

Shaher Momani

Keyword(s):

Convective Flow ◽

Second Law Of Thermodynamics ◽

Second Law ◽

Porous Space ◽

Arrhenius Activation Energy ◽

Suction Parameter ◽

Electrically Conducting ◽

Entropy Optimization ◽

Dimensionless Variables ◽

Mixed Convective Flow

Abstract Our intention in this article is to investigate entropy optimization in nonlinear mixed convective unsteady magnetohydrodynamic flow of nanomaterials in porous space. An exponentially stretched sheet creates the liquid flow. Nanomaterial is considered electrically conducting. The concentration and energy expressions comprise viscous dissipation, Joule heating, thermophoresis and Brownian motion aspects. Arrhenius activation energy is considered. Computation of entropy generation based upon the second law of thermodynamics is made. Nonlinear partial expressions are obtained via suitable dimensionless variables. Resultant expressions are tackled by the OHAM technique. Features of numerous variables on entropy, temperature, velocity and concentration are graphically visualized. Skin friction and the temperature gradient at the surface are also elaborated. Comparative analysis is deliberated in tabulated form to validate the previously published outcomes. Velocity is reduced significantly via the suction parameter. The entropy rate increases for higher values of Brinkman, Biot and Hartmann numbers.

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