Abstract
Riga plate consists of an electromagnetic actuator made of a spanwise network of intermittent electrodes and fixed magnet assembled on a flat surface. Electromagnetohydrodynamic (EMHD) effects play a crucial role in thermoelectric turbines, fluidics network flow control, paper chromatography, and miniature chillers. Driven by these functionality, the convective EMHD flow of water-based nanofluids through a parabolic Riga plate which is affected by applying ramping and isothermal constraints is simultaneously examined here. The modeling additionally includes the influence of radiation effect. The Laplace transform method is utilized to alleviate the ordinary differential equations derived from the rejuvenation of partial differential equations governing the flow. The consequences of contextual factors on energy and momentum distribution are investigated and graphically represented. The prevailing study's significant finding is that increasing the modified Hartmann number enhances the parabolic-velocity distribution of copper–water nanofluid. The escalating values of radiation parameter improve the thermal distribution for both cases. Here, copper–water-based nanofluid shows improved thermal distribution for isothermal wall than ramped wall case.
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Abbreviations
- LTM:
-
Laplace transform method
- \(E\) :
-
Modified Hartmann parameter
- EMHD:
-
Electromagnetohydrodynamic
- erf:
-
Error function
- erfc:
-
Complementary error function
- g:
-
Gravitational constant
- Gr:
-
Thermal Grashof number
- \(J_{0}\) :
-
Current density
- \(k\) :
-
Thermal conductivity (W/mK)
- \(k^{*}\) :
-
Mean absorption coefficient
- \(l\) :
-
Magnets' and electrodes' width
- \(m_{0}\) :
-
Magnetization of magnets
- Nu:
-
Nusselt number
- Pr:
-
Prandtl number
- \(q_{r}\) :
-
Radiative heat flux
- \(R\) :
-
Parameter for radiation
- \(S\) :
-
Width linked with the magnets and electrodes
- \(t^{\prime}\) :
-
Time (s)
- \(T\) :
-
Fluid temperature (K)
- \(T_{\infty }\) :
-
Ambient temperature (K)
- \(T_{\omega }\) :
-
Surface temperature (K)
- \(u\) :
-
Velocity of the fluid in the \(x\)-direction \(\left( {{\rm ms}^{ - 1} } \right)\)
- \(U\) :
-
Dimensionless velocity
- \(y\) :
-
Coordinate axis normal to the plate
- \(\rho\) :
-
Fluid density \(({\rm kgm}^{ - 3} )\)
- \(\Theta\) :
-
Dimensionless temperature
- \(\nu\) :
-
Kinematics viscosity \(({\rm m}^{2}\,{\rm s}^{ - 1} )\)
- \(\sigma^{*}\) :
-
Stefan–Boltzmann constant
- \(\zeta\) :
-
Dimensionless coordinate axis normal to the plate
- \(\rho C_{p}\) :
-
Heat capacitance \(({\rm kg\,m}^{ - 1}{\rm s}^{ - 2} {\rm K}^{ - 1} )\)
- \(\beta\) :
-
Volumetric coefficient of thermal expansion
- \(\omega\) :
-
Conditions at the wall
- \(\infty\) :
-
Free stream conditions
- f:
-
Fluid
- nf:
-
Nanofluid
- np:
-
Nanoparticles
- BCs:
-
Boundary conditions
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Asogwa, K.K., Kumar, K.T., Goud, B.S. et al. Significance of nanoparticle shape factor and buoyancy effects on a parabolic motion of EMHD convective nanofluid past a Riga plate with ramped wall temperature. Eur. Phys. J. Plus 138, 572 (2023). https://doi.org/10.1140/epjp/s13360-023-04170-3
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DOI: https://doi.org/10.1140/epjp/s13360-023-04170-3