Abstract
The impact of the isoflux boundary condition on forced convection magnetohydrodynamic flow past a cylinder subjected to an arbitrarily oriented external magnetic field is examined numerically. A fourth-order compact finite difference scheme is developed using cylindrical geometry to discretize the governing Navier–Stokes transport equation together with the energy equation and subsequently solve it utilizing the pseudo-time iterative technique. The flow and heat transfer properties are demonstrated with respect to the parameters such as Reynolds number (\({\text{Re}}\)), interaction parameter (M), magnetic inclination angle (\(\alpha \)) and Prandtl number (\(\text {Pr}\)). The magnitude of the local Nusselt number and surface pressure behave non-monotonically with increasing M for streamwise magnetic field (\(\alpha = 0^\circ \)). Conversely, for other magnetic angles (\(\alpha \ne 0^\circ \)), both the values display a monotonic trend on the cylinder surface. The critical interaction parameter (\(M_{\rm cr}\)) for the mean Nusselt number (\({\overline{\text {Nu}}}\)) is determined in case of the streamwise magnetic field. A non-monotonic behavior in the \(M_{\rm cr}\) values is observed depending upon the values of \(\text {Pr}\) and \({\text{Re}}\). The heat transfer under the isoflux boundary condition is significantly enhanced throughout the cylinder surface when compared to the isothermal boundary condition.
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Abbreviations
- \(C_{\rm dv},C_{\rm dp},C_D\) :
-
Coefficient of viscous, pressure and total drag
- \(C_{\rm p}\) :
-
Surface pressure
- \(c_{\rm p}\) :
-
Fluid specific heat capacity (\(\text{J}\,\text{kg}^{-1}\text{K}^{-1}\))
- d :
-
Diameter of cylinder (m)
- \({\mathcal {H}}_{\infty }\) :
-
Uniform magnetic field (\(\mathrm{wb\,m}^{-2}\))
- M :
-
Interaction parameter
- \(M_{\rm cr}\) :
-
Critical interaction parameter
- \(\text {Nu}\) :
-
Local Nusselt number
- \({\overline{\text {Nu}}}\) :
-
Average/mean Nusselt number
- p :
-
Non-dimensional pressure
- \(\text {Pr}\) :
-
Prandtl number
- \((r,\theta )\) :
-
Cylindrical polar co-ordinates
- \({\text{Re}}\) :
-
Reynolds number
- T :
-
Non-dimensional temperature (K)
- \(U_{\infty }\) :
-
Uniform velocity of fluid (\(\text {ms}^{-1}\))
- \({\mathcal {V}}_r\) :
-
Radial velocity components
- \({\mathcal {V}}_\theta \) :
-
Angular velocity components
- \(\alpha \) :
-
Magnetic inclination angle
- \(\beta \) :
-
Volumetric thermal coefficient (\(\text {K}^{-1}\))
- \(\Theta \) :
-
Temperature (K)
- \(\lambda \) :
-
Thermal diffusivity (\(\text {s}^{-1}\text {m}^2\))
- \(\nu \) :
-
Kinematic viscosity (\(\text {m}^2\text {s}^{-1}\))
- \((\xi , \eta )\) :
-
Modified coordinates (\(r=\text {e}^{\pi \xi }, \theta =\pi \eta \))
- \(\rho \) :
-
Density of fluid (\(\text {kg}\,\text {m}^{-3}\))
- \(\sigma \) :
-
Electrical conductivity (\(\text {S}\, \text {m}^{-1}\))
- \(\psi \) :
-
Non-dimensional stream function
- \(\omega \) :
-
Non-dimensional vorticity function
- \(\text{cr}\) :
-
Critical value
- D :
-
Total drag
- dp, dv :
-
Pressure and viscous drag
- s :
-
Surface of cylinder
- \(\theta \) :
-
Angular component
- \(\infty \) :
-
Free stream
- \('\) :
-
Dimensional parameter
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Saha, R., Raju, B.H.S. Influence of isoflux boundary condition on forced convection due to arbitrary orientation of magnetohydrodynamic flow in cylindrical geometry. Eur. Phys. J. Plus 139, 422 (2024). https://doi.org/10.1140/epjp/s13360-024-05229-5
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DOI: https://doi.org/10.1140/epjp/s13360-024-05229-5