Nonlinear mixed convection flow of a tangent hyperbolic fluid with activation energy

Heat Transfer ◽  
2020 ◽  
Vol 49 (5) ◽  
pp. 2427-2448 ◽  
Author(s):  
Wubshet Ibrahim ◽  
Tezera Gizewu
Keyword(s):  
Activation Energy ◽  
Mixed Convection ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Nonlinear Mixed Convection ◽  
Tangent Hyperbolic Fluid

scholarly journals MHD Nonlinear Mixed Convection Flow of Micropolar Nanofluid over Nonisothermal Sphere

2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Wubshet Ibrahim ◽  
Chaluma Zemedu
Keyword(s):  
Boundary Layer ◽  
Mixed Convection ◽  
Mathematical Formulation ◽  
Magnetic Field Effect ◽  
Skin Friction Coefficient ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Nonlinear Boundary Value Problems ◽  
Micropolar Nanofluid ◽  
Nonlinear Mixed Convection

In this paper, two-dimensional steady laminar boundary layer flow of a nonlinear mixed convection flow of micropolar nanofluid with Soret and magnetic field effect over a nonisothermal sphere is evaluated. The mathematical formulation for the flow problem has been made with appropriate similarity transformation and dimensionless variables, and the main nonlinear boundary value problems were reduced into mixed high-order nonlinear ordinary differential equations. Solution for velocity, microrotation, temperature, and concentration has been obtained numerically. The equations were calculated using method bvp4c from Matlab software for various quantities of main parameters. The effects of various parameters on skin friction coefficient f″0, wall duo stress coefficient -G′0, and convection mass transfer coefficient -Φ′0 are analysed and presented through the graphs and tables. The convergence test has been maintained. For the number of points greater than the suitable mesh number of points, the precision is not influenced but the set time is increased. Moreover, a comparison with a previous paper, obtainable in the literature, has been presented and an excellent agreement is obtained. The findings indicate that an increase in the values of nonisothermal parameters (m, P), magnetic Ma, thermal and solutal nonlinear convection (λ, s) parameter, and Soret number is to enhance the temperature difference between the boundary layer and ambient fluid to diffuse which increases the velocity profile f′ζ and their boundary layer thicknesses near the surface of the sphere.

scholarly journals Numerical study for mixed convection flow of Oldroyd-B nanofluid subject to activation energy and binary chemical reaction

2020 ◽  
pp. 174-174
Author(s):  
Dina Abuzaid ◽  
Malik Ullah
Keyword(s):  
Activation Energy ◽  
Mixed Convection ◽  
Heat Transport ◽  
Shooting Method ◽  
Numerical Study ◽  
Brownian Diffusion ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Developing Flow ◽  
Numeric Solution

This attempt discusses mixed convection Oldroyd-B nanoliquid flow over a doubly stratified surface in existence of activation energy. Impacts of Brownian diffusion and thermophoretic are additionally accounted. The non-linear frameworks are simplified by suitable variables. Shooting method is utilized to develop numeric solution of resulting issue. Graphs have been composed just to explore that how concentration and the temperature are impacted by different developing flow factors. Mass and heat transport rates are additionally tabulated and dissected. Furthermore, the temperature and concentration distributions are enhanced for larger thermophoresis parameter.

scholarly journals Thin Film Flow of Tangent Hyperbolic Fluid with Nonlinear Mixed Convection Flow and Entropy Generation

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Wubshet Ibrahim ◽  
Tezera Gizewu
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Entropy Generation ◽  
Film Flow ◽  
Convection Flow ◽  
Bejan Number ◽  
Mixed Convection Flow ◽  
Thin Film Flow ◽  
Nonlinear Mixed Convection ◽  
Tangent Hyperbolic Fluid

This paper examined the three-dimensional steady thin film flow of tangent hyperbolic fluid with nonlinear mixed convection flow and entropy generation past a stretching surface under the influence of magnetic field. For the flow problem, the Cattaneo–Christov heat and mass diffusion model was employed to examine heat and mass transfer characteristics and impacts of the normally directed magnetic field. To transform nonlinear PDEs into ODEs, the variable transformation technique was used. The bvp4c algorithm was implemented to solve these ODEs. The behavior of every leading parameter on the velocities, temperature, concentration profile, entropy generation, and Bejan number was reported with tabular and figurative form. The results show that as the values of Br increase, the entropy generation enhances, but the Bejan number decreases. Moreover, as the values of B increase, the opposite characteristics are observed in entropy generation and Bejan number graphs. Furthermore, the skin friction coefficient number, local Nusselt number, and Sherwood number are graphically discussed for the active involved parameters. The best agreement is recorded when we compare this paper with the previous literature for various values of M .

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