Abstract
The current study examines the consequences of viscous and Joule dissipations, and Hall current on steady buoyancy-driven MHD flow of Ti6Al4V-H2O-based nanofluid within an asymmetric channel with arbitrary wall thickness and conductance in the presence of a highly intense magnetic field. The boundary conditions for the induced magnetic field are also derived. The closed-form solutions for velocity field, induced magnetic field, temperature field, surface skin friction, mass flow rate and critical Grashof number are extracted from non-dimensional flow model analytically, while the numerical values of heat transport rate are obtained by mathematical computations using MATLAB software. The results of the study are thoroughly discussed with the assistance of graphs and tables. Such study has great importance in analyzing the heat transport behavior of the highly electrically conducting nanofluids. A special feature observed from this investigation is that, on incrementing the wall electrical conductivity, the fluid velocity reduces due to induction of magnetic drag. On raising the volumetric concentration of nanoparticles in the fluid, the fluid temperature raises and hence the fluid velocity rises due to generation of more thermal buoyancy force. The viscous dissipation leads to rise the fluid temperature due to rise in internal energy of the system.
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Abbreviations
- \(C_{p}\) :
-
Specific heat at constant pressure
- \(\vec{E}\) :
-
Electric field
- \({\text{Er}}\) :
-
Eckert number
- \(g\) :
-
Acceleration due to gravity
- \(g_{\Theta }\) :
-
Thermal Grashof number
- \({\text{Gc}}\) :
-
Critical Grashof number
- \(\vec{h}\) :
-
Magnetic field vector
- \({\text{Hc}}\) :
-
Hall current parameter
- \(H_{0}\) :
-
Applied magnetic field
- \(\left( {h_{1} ,\,\,h_{2} ,\,\,\,h_{3} } \right)\) :
-
Components of induced magnetic field along the coordinate axes
- \(\vec{J}\) :
-
Current density
- \(k\) :
-
Thermal conductivity
- \(M\) :
-
Mass flow rate
- \({\text{Mg}}\) :
-
Magnetic parameter
- \(\Pr\) :
-
Prandtl number
- \({\text{Ro}}\) :
-
Rotation parameter
- \(\vec{u}\) :
-
Fluid velocity
- \(\left( {u_{1} ,\,\,u_{2} ,\,\,u_{3} } \right)\) :
-
Components of velocity along the coordinate axes
- \(w\) :
-
Thickness of the wall of the channel
- \(w_{0}\) :
-
Separation of the walls of the channel
- \(\left( {x_{1} ,x_{2} ,x_{3} } \right)\) :
-
Rectangular Cartesian coordinate
- \(\beta\) :
-
Volumetric thermal expansion coefficient
- \(\mu\) :
-
Dynamic viscosity
- \(\mu_{e}\) :
-
Magnetic permeability
- \(\upsilon\) :
-
Coefficient of viscosity
- \(\vec{\Omega }\) :
-
Angular velocity of the gyration
- \(\phi\) :
-
Wall conductance constants
- \(\rho\) :
-
Fluid density
- \(\sigma\) :
-
Electrical conductivity
- \(\theta\) :
-
Fluid temperature
- \(\Theta\) :
-
Non-dimensional fluid temperature
- \(\tau\) :
-
Non-dimensional skin friction
- \(\vartheta\) :
-
Volume fraction constant of nanofluid
- \(f\) :
-
Quantities for base fluid
- \(l\) :
-
Quantities at the lower wall of the channel
- \({\text{nf}}\) :
-
Quantities for nanofluid
- \(s\) :
-
Quantities for suspended nanoparticles
- \(u\) :
-
Quantities at the upper wall of the channel
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Singh, J.K., Kolasani, S. Energy dissipation and Hall effect on MHD convective flow of nanofluid within an asymmetric channel with arbitrary wall thickness and conductance. Eur. Phys. J. Plus 136, 1074 (2021). https://doi.org/10.1140/epjp/s13360-021-02022-6
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DOI: https://doi.org/10.1140/epjp/s13360-021-02022-6