In the present work, steady-state hydromagnetic analysis and flow formation of Newtonian viscous fluid through a vertical microporous channel is studied theoretically. The transport governing equations include the effect of Hall current and ion-slip effects in the microchannel slip regime. Unlike the usual employed thermal properties of constant heat flux/temperature at the boundary, the current work assumes that the microporous walls are influenced by different surrounding wall temperatures. Solution to the governing equations depending on Prandtl number, rarefaction parameter, Hall current parameter, ion-slip parameter, Hartmann number and suction/injection parameter are obtained by utilizing the method of undetermined coefficient. Results demonstrating the effect of these parameters on different flow features are presented graphically in MATLAB. The results reveal that in the simultaneous occurrence of Hall and ion-slip currents, higher values of rarefaction parameter enhance the momentum boundary layer in both primary and secondary flow directions. In addition, results from this analysis also reveal that the main component of fluid velocity remains unaffected to higher values of Hall current, whereas it decreases along the induced flow directions. Furthermore, for a specific value of Hall parameter and ion-slip current, injection weakens the buoyancy drive resulting in a reduction in volume flow rate. The contrast is true with suction.

Introduction

Hydromagnetic flow in microchannels is important owing to new advances in technological applications like magneto-plasma dynamics (MPD) thrusters, boundary layer heat transfer, micro-chip cooling, microelectromechanical systems (MEMS), nanoelectromechanical systems (NEMS) and biochemical cell reaction. These flows are also encountered in many nuclear thermohydraulic processes and magnetohydrodynamic energy systems. Studies relating to this type of flows are important to improve the efficiency of these devices. Owing to its widespread applications, the groundbreaking work of Hartmann [1] leads to several studies on hydromagnetic free convection flows both theoretically and experimentally. Few among them include the following: Jha and Aina [2] illustrated the impact of magnetic field applied transversely and mixed convection current on MHD flow of conducting fluid through a microchannel in the occurrence of induced magnetic field. Jha and Aina [3], in a recent study, extended their work to the situation when one of the microchannel walls is assumed to be electrically conducting. Jha and Aina [4] also examined the influence of induced magnetic field on MHD free convection past an insulated vertical microchannel. Other notable works on MHD flow are as follows: Chandran et al. [5] analyzed the flow of viscous incompressible and electrically conducting fluid in a porous channel with magnetic and heat transfer effects. In a connected work, Chandran et al. [6] extended their study to investigate the effect of constant heat flux and accelerated movement of the boundary walls. Jha and Apere [7] investigated on hydromagnetic flow of viscous incompressible fluid past a permeable channel due to sudden impulsive motion.

It is challenging to observe that in most of the reported literature, the occurrence of Hall current in the magnetohydrodynamic flow equations has been neglected. These assumptions become feasible for low magnetic field strength. As reported by Cowling [8], it becomes relevant to note that in the instance when the magnetic field is taken to be strong, the effect of Hall current befits its significance and should not be neglected. Some studies on the above subject include the following: Singh [9] examined the hydromagnetic flow of conducting fluid due to buoyancy force in the presence of Hall current and observed that cooling the permeable wall supports flow formation in the presence Hall current, while the contrast is displayed for heating. Seth and Ansari [10], in their analysis, reported the impact of Hall current on free conductive flow of conducting fluid past a rotating system. Seth and Singh [11] also reported the impact of Hall current on hydromagnetic convective flow in the occurrence of constant pressure past a conducting/insulated revolving system. They established that in the occurrence of Hall current, a rise in rotation weakens the main flow velocity, while the contrast is revealed toward the induced flow direction. Attia [12] offered an investigation on unsteady viscous flow in the occurrence of Hall current and heat transfer effects. It was observed that Hall parameter strengthens the impact of magnetic field on both main flow and induced flow velocity profiles. Recently, Jha et al. [13] studied the impact of Hall current on hydromagnetic convective flow of viscous fluid past a microchannel with different surrounding temperatures. They found out that Hall current aids flow formation along main flow direction for both symmetric and asymmetric heating. Other articles on the above subject under different geometric situations are as follows: Ram [14], Ali et al. [15], Makinde et al. [16], Krishna and Jyothi [17], Jha and Apere [18, 19], Mazumder et al. [20], Ghosh [21], Jha and Malgwi [22] and Seth and Singh [23].

In a connected work, Zhang et al. [24] investigated the influence of induced magnetic field on hybrid nanofluid flow of viscous incompressible and electrically conducting fluid near an elastic surface. Electroosmotic flow of non-Newtonian fluid in a microchannel in the occurrence of nanoparticles has been investigated by Bhatti et al. [25]. Analysis of non-local nanobeams incorporating the Euler–Bernoulli and modified coupled stress theory has been discussed by Abouelregal and Marin [26]. Ghita et al. [27] formulated some models by utilizing the local hardening behavior of a plastic material following the Prandtl–Reuss law. In a related work, Anwar et al. [28] discussed enhancement in radiative heat transfer of hydromagnetic flow of Oldroyd-B fluid in a porous channel under generalized boundary conditions. Other relevant works include Bratu et al. [29], Marin et al. [30] and Jha et al. [34].

In all the above-reported literature studies, none considered the combined effects of Hall current and ion-slip influence on hydromagnetic convective flow involving a viscous fluid through a permeable microchannel subject to symmetric/asymmetric surrounding wall surface temperatures. Studies relating to these flows have found relevance in the field of fluid engineering and other manufacturing industries and have not been accounted for in the open literature, which is the motivation of this work. Jha et al. [31] investigated the influence of transversely applied magnetic field on natural convection flow of Newtonian viscous fluid in a vertical microporous channel heated asymmetrically. The present work is an extension of the work of Jha et al. [31] by incorporating the combined influence of Hall and ion-slip current in the presence of simultaneous suction/injection on steady hydromagnetic flow of conducting viscous fluid in a vertical microchannel. Hence, the main objective of this work is to present a theoretical analysis on influence of Hall and ion-slip current in a vertical microporous channel with asymmetrical thermal boundary conditions. It is well established that analytical solutions have their own theoretical meaning and play a vital role in the early development of many fluid mechanics and heat transfer problems. Furthermore, theoretical analysis could be useful in validating the accuracy and convergence and improving the effectiveness of most numerical computation and experimental analysis. As stated earlier, the impact of Hall current in the occurrence of ion-slip current becomes significant when the influence of the applied magnetic field becomes large, thereby inducing secondary flow. Effects of flow parameters on velocity, volume flow rate, skin friction and volume flow rate are examined.

Method

Consider the one-dimensional buoyancy-driven flow of viscous incompressible and electrically conducting fluid through a vertical microchannel. The microchannel walls are assumed to be porous and heated with different surrounding wall temperatures. The impact of Hall and ion slip are included in the flow equations. The \(x^{\prime}\)-coordinate is taken along the walls, ascending vertically upward, whereas the \(y^{\prime}\)-coordinate is measured perpendicular to the walls as revealed in Fig. 1. The walls of the microchannel are subjected to surrounding temperatures: \(T_{1}\) at the right wall and \(T_{2}\) at the left wall and assuming \(T_{1} > T_{2}\). Also, the magnitude of Reynolds number is assumed to be almost insignificant such that the magnetic induction effects could be neglected. It is anticipated that a constant suction/injection velocity \(\left( {v_{0}^{\prime } } \right)\) is supplied to the porous walls. Initially, the hydromagnetic and thermal flow is taken along the vertical \(x^{\prime}\)-axis; however, as a result of the influence of Hall current, secondary flow (induced flow) is generated along the \(z^{\prime}\)-direction. Hence, the velocity field and magnetic field are of the form: \(\vec{V} = \left( {u^{\prime},v_{0}^{\prime } ,w^{\prime}} \right)\) and \(\vec{B} = \left( {0,H_{0}^{\prime } ,0} \right)\).

The generalized Ohm’s law in the existence of Hall current and ion-slip effect is of the form (Sutton and Sherman [32]):

It is interesting to note that since the hydromagnetic flow is regarded at the microscale level, fluid flow neighboring to the surfaces is not in thermal equilibrium. As a result, the fluid no longer reaches the velocity or temperature of the wall surface, necessitating the use of a slip condition for the velocity and a jump condition for the temperature. The usual continuum approach is used in this analysis by the continuum equations with the two main characteristics involved in microscale flow phenomena: velocity slip and temperature jump. In the present work, the boundary condition incorporating the velocity slip and temperature jump situations is defined following Jha and Malgwi [22] as:

Numerical values for \(\Pr\), \(\lambda_{{\text{r}}}\), \(\gamma_{{\text{s}}}\)\(f_{{\text{v}}}\) and \(f_{{\text{t}}}\) are adopted following Eckert and Drake [33].

Assuming \(F = u + iw\), Eqs. (8) and (9) simplify to:

where \(\tau_{x} = {\text{Real}}\left( {\frac{{{\text{d}}F}}{{{\text{d}}y}}} \right)\) and \(\tau_{z} = {\text{Imag}}\left( {\frac{{{\text{d}}F}}{{{\text{d}}y}}} \right)\).

Discussion

Throughout this section, analysis on the influence of Hall parameter and ion-slip current on steady hydromagnetic flow in the occurrence of magnetic field will be investigated. Using the exact solutions obtained in the previous section, a MATLAB code was prepared to illustrate some interesting flow behaviors using line graphs. During the course of the investigation, reasonable range of value for various flow parameters include: \(0.0 \le \beta_{{\text{v}}} {\text{Kn}} \le 0.1\), \(0.01 \le \beta_{{\text{h}}} \le 0.10\), \(1.0 \le \beta_{{\text{i}}} \le 9.0\), \(0.5 \le S \le 1.5\) and \(2 \le M \le 4\) with fixed values \(\beta_{{\text{v}}} {\text{Kn}} = 0.05,l = 1.667,S = 0.5,\beta_{{\text{h}}} = 0.10,\alpha_{e} = 3.0,{\text{and}}\,\,\,M = 2.0\). The novelty of the present work is that the influence of various governing parameters was investigated for three cases of the wall–ambient temperature difference ratio (\(\xi\)) in the occurrence of Hall effect (\(\beta_{{\text{h}}}\)) and ion-slip current (\(\beta_{i}\)): \(\xi = 1\) suggests that the two walls are heated with equal temperatures (symmetric), \(\xi = 0\) suggests only one of the walls is heated (asymmetric), and \(\xi = - 1\) suggests one of the walls is heated and the other wall is cooled (asymmetric).

The solution for energy equation as given in Eq. (16) is the same with that of Jha et al. [31] in the slip regime. Hence, active flow parameters on temperature distribution have been comprehensively considered in [31].

Furthermore, numerical solution and values for velocity in the absence of Hall current (\(\beta_{e}\)) and ion-slip parameter (\(\beta_{{\text{i}}}\)) found in the existing work were compared with Jha et al. [31] and are presented in Table 1. From the results reported, an excellent agreement is found, thus validating the solution obtained.

Figure 2a, b displays the combined effect of wall–ambient temperature difference ratio (\(\xi\)) and rarefaction parameter (\(\beta_{{\text{v}}} {\text{Kn}}\)) on the main and induced fluid velocity distribution profiles in the occurrence of Hall and ion-slip current. From the figure, it is evident that for \(\xi = 1\,\,\,{\text{and}}\,\,\xi = 0\), both the main flow velocity and induced velocity increase with \(\beta_{{\text{v}}} {\text{Kn}},\) while they decrease for asymmetric heating (\(\xi = - 1\)). The impeding influence of the microporous walls diminishes with the rise in rarefaction parameter (\(\beta_{{\text{v}}} {\text{Kn}}\)), thereby boosting both components of the fluid velocity. In addition, it is interesting to observe that the effect of \(\beta_{{\text{v}}} {\text{Kn}}\) on velocity becomes stronger and more pronounced in a situation where the surrounding microporous walls are heated equally (\(\xi = 1\)).

Figure 3a, b shows the combined effect of wall–ambient temperature difference ratio (\(\xi\)) and Hartmann number (\(M\)) on the main and induced velocity profiles. Figure 3a reveals the effect of Hartmann number (\(M\)) on the main fluid velocity in the occurrence of Hall and ion-slip. The figure shows that a rise in Hartmann number weakens velocity when the surrounding wall temperatures are equal (\(\xi = 1\)) and when only one of the surrounding wall is heated (\(\xi = 0\)). The contrast is revealed when \(\xi = - 1\). The justification of this on the hydrodynamics is due to a rise in mechanical resistive force with an increase in Hartmann number. The reverse of this behavior is shown in Fig. 3b.

Figures 4 and 5 illuminate the impact suction/injection on the main flow and induced components of velocity under different surrounding temperatures (\(\xi\)). From the figure, it is evident that both the main flow and induced components of fluid velocity decrease with injection for all considered values of \(\xi,\) while the reverse behavior is seen with suction (Fig. 5).

Figure 6 displays the effects of Hall current parameter (\(\beta_{{\text{h}}}\)) on the main flow and induced velocity within the microporous channel for different wall heating conditions (\(\xi\)). The figure reveals that in the occurrence of ion-slip, the main flow velocity is insensitive to a rise in Hall parameter (\(\beta_{{\text{h}}}\)) for \(\xi = 1\), \(\xi = 0\,\,\,{\text{and}}\,\,\xi = \, - 1\) surrounding situations. When the induced flow component is considered on the other hand, it is worth noting that a rise in Hall parameter augments induced velocity distribution for \(\xi = 1\,\,\,{\text{and}}\,\,\xi = 0\) wall heating situations.

The effect of ion-slip current (\(\beta_{{\text{i}}}\)) on the main flow and induced fluid velocity profiles is depicted in Fig. 7a, b. Illustrations from the figure suggest that for \(\xi = 1\,\,\,{\text{and}}\,\,\xi = 0\) wall heating conditions, introducing ion-slip current (\(\beta_{{\text{i}}}\)) aids the flow along the main flow direction, causing a rise in velocity distribution, whereas it weakens the induced velocity. Also, the figure suggests that induced velocity weakens with a rise in \(\beta_{{\text{i}}}\) until the net velocity becomes zero. With the inclusion of Hall current, a rise in ion slip supports the magnetic lines of force, yielding a reduction in velocity profile.

Figures 8, 9, 10, 11, 12 and 13 demonstrate the variations of skin friction along the main flow and induced flow directions (\(\tau_{x} ,\tau_{z}\)) with active flow parameters at \(y = 0\,\,\,{\text{and}}\,\,\,y = 1\) correspondingly. The combined effect of Hartmann number (\(M\)), rarefaction parameter (\(\beta_{{\text{v}}} {\text{Kn}}\)) and wall–ambient temperature difference ratio (\(\xi\)) on \(\tau_{x0} \,\,\,{\text{and}}\,\,\,\tau_{z0}\) is illustrated in Fig. 8a, b at the wall \(y = 0\). The figure shows that simultaneously growing \(M\) and \(\beta_{{\text{v}}} {\text{Kn}}\) drops \(\tau_{x0},\) while it rises \(\tau_{z0}\) for \(\xi = 1\,\,\,{\text{and}}\,\,\,\xi = 0\) wall heating situations. From Fig. 9, on the other hand, it is observed that \(\tau_{x1}\) decreases with \(\beta_{{\text{v}}} {\text{Kn}},\) whereas it increases with \(M\). The contrast result is true and can be observed for \(\tau_{z1}\) in Fig. 9b.

Figures 10 and 11 reveal that skin friction profile along the main flow direction at \(y = 0\,\,\,{\text{and}}\,\,\,y = 1\) identified as \(\tau_{x0} \,\,{\text{and}}\,\,\tau_{x1}\) remains insensitive to a rise in Hall parameter (\(\beta_{h}\)). However, a rise in wall–ambient temperature difference ratio (\(\xi\)) yields an increase in \(\tau_{x0} \,\,{\text{and}}\,\,\tau_{x1},\) respectively. On the other hand, the induced component of skin friction \(\tau_{z0} \,\,{\text{and}}\,\,\tau_{z1}\) is observed to increase with \(\beta_{{\text{h}}}\) for \(\xi = 1\,\,\,{\text{and}}\,\,\,\xi = 0\) wall heating situations, whereas it decreases for \(\xi = - 1\).

The response of skin friction at the microchannel walls (\(\tau_{x} \,\,{\text{and}}\,\,\tau_{z}\)) with variations in ion-slip current (\(\beta_{{\text{i}}}\)) and rarefaction parameter (\(\beta_{{\text{v}}} {\text{Kn}}\)) is displayed in Figs. 12 and 13 for different values of \(\xi\). From Fig. 12, it is observed that when either of the surrounding wall temperatures is the same or otherwise (symmetric/asymmetric:\(\xi = 1\,,\,\,\,\xi = 0\)), the skin friction (\(\tau_{x0}\)) along the main flow direction increases with ion-slip current irrespective of the value of the rarefaction parameter (\(\beta_{{\text{v}}} {\text{Kn}}\)), whereas it decreases along the induced direction (\(\tau_{z0}\)). The reverse of this occurrence is shown in Fig. 13a, b at wall \(y = 1\).

Figures 14, 15, 16 and 17 demonstrate the variations of the main flow and induced flow volume flow rate (\(Q_{x} ,Q_{z}\)) with various flow parameters. The effect of injection (positive value of \(S\)) as well as wall–ambient temperature difference ratio (\(\xi\)) on volume flow rate alongside the main flow and induced flow direction, respectively, is depicted in Fig. 14a, b in the existence of Hall parameter (\(\beta_{{\text{h}}}\)) and ion-slip current (\(\beta_{{\text{i}}}\)). The figure shows that in a situation where \(\xi = 1,\,0\,\,{\text{or}}\,\, - 1\), an increase in injection yields a decline in both the main and induced volume flow rate profiles (\(Q_{x} ,Q_{z}\)). In this case, the cold fluid particles are injected alongside the left cooler wall and sucked alongside the right heated wall, thereby horizontally reducing the convection current and consequently the volume flow. The reverse phenomenon is observed with suction as displayed in Fig. 15a, b. However, it is noted that suction enhances the volume flow for symmetric wall heating.

Figure 16 illustrates the effect of Hall current parameter (\(\beta_{{\text{h}}}\)) on volume flow rate distribution in the presence of suction/injection parameter (\(S\)) and ion-slip current (\(\beta_{{\text{i}}}\)). The results reveal that when the ion-slip current (\(\beta_{{\text{i}}}\)) is large and dominates the flow, the impact of Hall current becomes irrelevant on the main component of volume flow rate (\(Q_{x}\)) in the existence of rarefaction parameter (\(\beta_{{\text{v}}} {\text{Kn}}\)). When the induced component is considered on the other hand (Fig. 16b), it is evident that the effect of Hall parameter (\(\beta_{{\text{h}}}\)) on volume flow rate becomes more pronounced in the presence of wall–ambient temperature difference ratio (\(\xi\)). The figure suggests that an increase in \(\beta_{{\text{h}}}\) causes an enhancement in \(Q_{z}\) for \(\xi = 1\,\,\,{\text{and}}\,\,\,\xi = - 1,\) whereas it decreases for \(\xi = 0\). The figure also suggests that \(Q_{z}\) is unaffected with an increase in \(\beta_{{\text{v}}} {\text{Kn}}\) for all considered values of \(\beta_{{\text{h}}}\) and \(\xi\).

From Fig. 17a, b, it is interesting to observe that ion-slip current (\(\beta_{{\text{i}}}\)) supports flow development alongside the vertical main flow direction, thereby augmenting the volume flow rate (\(Q_{x}\)) toward the main flow direction for \(\xi = 1\,\,\,{\text{and}}\,\,\,\xi = 0,\) while a reverse flow is encountered for asymmetric heating (\(\xi = - 1\)). The induced component of volume flow reveals a contrast of this behavior as an increase in ion-slip current destabilizes flow formation, causing the net volume flow to be zero for all wall heating situations.

Conclusion

In the present work, theoretical analysis on the combined effects of Hall current and ion-slip effects on magnetohydrodynamic flow is examined. Solutions to the flow equations are obtained analytically for fluid temperature, velocity, induced magnetic field, induced current density, volume flow rate and skin friction and are presented in dimensionless form under relevant boundary conditions. The main conclusion of the analysis is that:

1.

A rise in Hartmann number declines velocity distribution along the vertical main flow direction for symmetric (\(\xi = 1\)) and asymmetric wall heating (\(\xi = 0\)), whereas it increases along the induced flow direction.

2.

An increase in rarefaction parameter (\(\beta_{{\text{v}}} {\text{Kn}}\)) enhances the gas velocity in both the main flow and induced flow directions.

3.

In the occurrence of ion-slip current, vertical main flow velocity and volume flow rate remain unchanged with an increase in Hall current parameter, whereas they increase along the induced flow direction.

4.

For all deliberated microchannel surrounding heating conditions (\(\xi\)) and rarefaction parameter (\(\beta_{{\text{v}}} {\text{Kn}}\)), an increase in injection (positive value of S) declines both the main flow and induced volume flow rate.

Availability of data and materials

Not applicable.

Abbreviations

\(b\)
:

Channel gap

\(C_{{\text{p}}} ,\,C_{{\text{v}}}\)
:

Specific heat for pressure and volume

\(f_{{\text{v}}} ,\,f_{{\text{t}}}\)
:

Coefficient of thermal/tangential momentum accommodation

Ratio of specific heat \(C_{{\text{p}}} /C_{{\text{v}}}\)

\(\sigma\)
:

Electrical conductivity of the fluid

\(\mu\)
:

Dynamic viscosity

\(\xi\)
:

Wall–ambient temperature difference parameter

\(\rho\)
:

Density

\(\alpha\)
:

Thermal diffusivity

\(\lambda\)
:

Molecular mean free path

\(\beta_{{\text{t}}}\)
:

Temperature jump

\(\beta_{{\text{v}}}\)
:

Velocity slip

\(\upsilon\)
:

Kinematic viscosity

\({\text{r}}\)
:

Reference-state values

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BKJ and PBM contributed to problem formulation, analysis, computation, solution, write-up and mathematical analysis. All authors have read and approved the manuscript.

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Jha, B.K., Malgwi, P.B. Hydromagnetic free convection flow in a vertical microporous channel with Hall current and ion-slip effect.
J Egypt Math Soc30, 21 (2022). https://doi.org/10.1186/s42787-022-00155-w