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Hall and ion slip effects on Unsteady MHD Convective Rotating flow of Nanofluids—Application in Biomedical Engineering
Journal of the Egyptian Mathematical Society volume 28, Article number: 1 (2020)
Abstract
There is an intense worldwide activity in the development of instrumentation for medical diagnosis and bioscreening based on biological labeling and detection of nanoparticles. Based on this profound observation, Hall and ion slip effects on magnetohydrodynamic (MHD) free convective rotating flow of nanofluids in a porous medium past a moving vertical semiinfinite flat plate are investigated. The equations for governing flow are solved analytically by perturbation approximation. The effects of various parameters on the flow are discussed through graphs and tables. The velocity increases with Hall and ion slip parameters. An increase in the convective parameter led to amplify the thermal boundary layer thickness, but when the heat generation parameter is taken into consideration, an opposite effect occurs. The skin friction coefficient increases with an increase in nanoparticle volume fraction and it reduces with increase in Hall and ion slip parameters. Outcomes disclose that the impact of thermal convection of nanoparticles has increased the temperature distribution, which helps in destroying the cancer cells during the drug delivery process.
Introduction
The homogeneous mixture of nanoparticles contains two liquids known as nanofluids. Nanoparticles operating in nanofluids are composed of carbon nanotubes, oxides, metals, and carbides. The base is made up of liquid oil, ethylene glycol, and water. The nanofluid was first proposed by Choi [1]. Nanofluids have applications in microelectronics, microfluidics, transportation, biomedical, Xrays, material processing, and scientific measurement. Buongiorno proposed an analytical model for convective transport in nanofluids, which incorporate the effects of Brownian diffusion and thermophoresis. These nanoparticles also hold a lot of significance in the areas of biological and medical applications. Some nanoparticles can bind many drugs, proteins, and target cancer cells. Since many nanoparticles have high atomic numbers that can produce heat, they lead to the treatment of tumorselective photothermal therapy. Most of the nanoparticles can cure and help in targeting the deadly cancer cells. Flow through porous medium with nanoparticles has significant applications in biomedical science (such as drug delivery and cancer treatment to treat radiotherapy) and chemical engineering (transport of chemicals).
A major interest of convective heat transmission of nanofluids in sciences and engineering is incredibly significant. It is due to various varieties of cool devices like microelectronics and electronic gear and solar power technology. Water, ethylene glycol, and engine oil are heating or cooling agents and play a decisive job in thermal management of many industries with poor thermal conductivity. Recent investigations have given more attention towards thermal convection flows. The rate of thermal energy transmission from one point to another point enhances in several conductive and convection processes. The thermal energy vigorously depends on the variation of heat at the locomotion. However, in thermal radiation, energy transmission between two bodies depends upon absolute heat variation. Thermal radiation has so many applications in biomedical. Because of its application in biomedical and medical treatment, the outcome of thermal radiation with double diffusion has become an important research subject to many researchers. Infrared radiation is one of the most commonly used techniques for the treatment of heat in various parts of the body. Infrared radiation is made up of electromagnetic waves. It lies between the visible light and the microwave. It helps in correcting many skinrelated problems. Any radiation entering the skin depends on the composition, vascularity, pigmentation, and wavelength of the radiation. Infrared radiation helps treat heat, directly heating blood vessels in the affected area of the body. It raises the blood supply in the body, which helps in adequate infection of the wound. It raises WBC and removes waste products. It is used in arthritic joints and other inflammatory conditions. Blood flows to different parts of the body. In skin friction, heat transmission occurs through radiation, evaporation, conduction, and circulation. It is known that infrared radiation is made up of electromagnetic waves, and so in the case of radiation heat transfer, the choice is transmitted by electromagnetic wave.
The porous medium is considered homogeneous and is present in local thermal equilibrium with isotropic nanoclides. Blood flow resistance for microbial biofilm and heat transmission around biological tissues, the concept of electronic preservation, hydrodynamic modeling of tissueengineered materials, and general methods of antibiotic therapy. It describes how biofilm pores affect the hydrodynamics of the media. It describes a model of flow changes in brain aneurysms and recent advances in turbulence estimation methods, modeling passive mass transport processes, and also sheds light on cellular membranes. Further, it also has biochemical impacts and largescale transport by the skin [2].
In many realistic applications that require a strong magnetic field, there is a need to think both the Hall and ionslip currents because of the significant effect they have on the vector of the current density and transitively on the magnetic force idiom. The effects of Hall and ionslip parameters on mixed convective electrically conducting nanofluid flow between two parallel concentric cylinders considering magnetic field has been discussed by Srinivasacharya and Shafeeurrahman [3]. Veera Krishna and Chamkha [4] investigated the diffusionthermo, radiationabsorption and Hall and ion slip effects on MHD free convective rotating flow of nanofluids (Ag and TiO2) past a semiinfinite permeable moving plate with a constant heat source. Veera Krishna and Chamkha [5] discussed the MHD squeezing flow of a waterbased nanofluid through a saturated porous medium between two parallel disks taking Hall current into account. Ram [6] investigated the effects of Hall and ion slip currents on MHD rotating free convective heatgenerating flow. Seddeek [7] has discussed the effects of Hall and ionslip currents and Heat transfer on magnetomicropolar fluid over a nonisothermal stretching sheet with suction and blowing. Seddeek and Abdelmeguid [8] discussed the boundary layer analysis which is used to the effects of Hall and ionslip currents on steady magnetomicropolar fluid over a horizontal plate. Jha and Apere [9] investigated unsteady MHD Couette flow of a Newtonian fluid between two rotating parallel plates taking hall and ionslip currents. Uddin and Kumar [10] discussed Hall and ionslip effect on the thickness of the boundary layer flow of a micropolar fluid over a wedge. Ellahi et al. [11] conducted a theoretical study of the problem of the peristaltic flow of Jeffrey fluid in a nonuniform rectangular duct under the effects of Hall and ion slip. Bhatti et al. [12] discussed the effect of Hall and ion slip on peristaltic blood flow of Eyring Powell in a nonUniform Porous twodimensional channel under long wavelength approximation of zero Reynolds number. Veera Krishna and Subba Reddy [13] investigated the transient MHD flow of a reactive secondgrade fluid through a porous medium between two infinitely long horizontal parallel plates. Jitendra and Srinivasa [14] investigated Hall and ion slip effects on the convective flow of a rotating fluid. Dileep and Priyanka [15] discussed the Hall effects on MHD viscous electrically conducting fluid flow and heat transfer in a parallel plate channel partially filled with a porous medium with an inclined magnetic field in a rotating system. Veera Krishna et al. [16] discussed the Hall effects on unsteady MHD oscillatory free convective flow of secondgrade fluid through porous medium between two vertical plates. Veera Krishna and Chamkha [17] have delivered the unsteady MHD flow of secondgrade fluid through porous medium with ramped wall temperature and ramped surface concentration with Hall effects. Veera Krishna et al. [18] have investigated heat and mass transfer on MHD chemically reacting flow of micropolar fluid through a porous medium with Hall effects. Veera Krishna et al. [19] discussed the Soret and Joule effects of MHD mixed convective flow of an incompressible and electrically conducting viscous fluid past an infinite vertical porous plate considering Hall effects. Veera Krishna et al. [20] have discussed Hall effects on MHD peristaltic flow of Jeffrey fluid through porous medium in a vertical stratum. Sara and Bhatti [21] investigated MHD peristaltic flow of a nonNewtonian nanofluid with chemical reaction, Hall and ionslip currents. Bhatti et al. [22] discussed the effects of heat transfer and Hall current on the sinusoidal motion of solid particles through a planar channel. Waqas et al. [23] investigated to visualize the flow of modified second grade nanofluid with heat, motile microorganisms, and mass transfer rates over stretching surface. Sheikholeslami and Bhatti [24] analyzed magnetic nanofluid transportation under the effect of a nonuniform magnetic field in a porous cavity. The effects of heat and mass transfer on free convective flow of micropolar fluid were studied over an infinite vertical porous plate in the presence of an inclined magnetic field with a constant suction velocity and taking Hall current into account have been discussed by Veera Krishna et al. [25]. Veera Krishna and Chamkha [26] have discussed the systematic solution of timedependent mean velocity on MHD peristaltic rotating flow of an electrically conducting couple stress fluid in a uniform elastic porous channel.
The aforementioned studies and literature survey bear witness that the analysis of Hall and ion effects of a viscous incompressible electrically conducting nanofluid in an infinite vertical plate with rotation effect has not been presented yet. In order to fill the gap of the existing literature, the Hall and ion slip effects on the unsteady MHD free convective rotating flow of nanofluids in a porous medium past infinite vertical flat plate have been undertaken and discussed.
Formulation and solution of the problem
We have considered Hall and ion slip effects on the unsteady free convective flow of nanofluids (Cu and TiO_{2}) of ambient temperature T_{∞} over a vertical semiinfinite moving plate entrenched in a homogeneous porous medium under thermal buoyancy effect with a constant heat source and convective boundary conditions. We assumed both the fluid phase and nanoparticles are in a thermal equilibrium state. Also, we assume a uniform shape and sized nanoparticles. The nanoparticles of a smaller size than that of the matrix pores are suspended in nanofluid using either surfactant or surface change technology, preventing the agglomeration and deposition of these on the porous matrix. The porous medium is considered as homogeneous as well as isotropic and is in local thermal equilibrium with the nanofluid. The thermophysical properties of pure water, Cu, and titanium oxide nanoparticles are taken to be constant at a reference temperature (25 °C) and are given in Table 1 [27].
Figure 1 portrays the physical model of the problem. The flow is assumed to be in the xdirection which is obtained along the plate in the ascendant direction and zaxis is normal to it. The entire system rotates with an angular velocity Ω about zaxis. An unvarying peripheral magnetic field B_{0} is taken to be acting along the zaxis. There is no applied voltage (E = 0). The induced magnetic field is tiny compared to the external magnetic field.
Due to semiinfinite plate surface assumption, all the variables are functions of z and time t only. Under the boundary layer approximations, the basic equations that describe the physical situation are given by
The boundary conditions are
The electronatom collision frequency is assumed very high, so that Hall and ionslip currents cannot be neglected. Hence, the Hall and ionslip currents give rise to the velocity in ydirection. When the strength of the magnetic field is very large, the generalized Ohm’s law is [28]
The component equations of (7) are
On solving Eqs. (8) and (9), we get
Substituting the Eqs. (10) and (11) in (3) and (2), respectively, we obtain
The effective density, thermal diffusivity, heat capacitance, thermal conductivity [29], thermal expansion coefficient, and effective dynamic viscosity [30] of the nanofluid are
where w_{0} represents the normal velocity at the plate, which is positive for suction and negative for injection. The following dimensionless variables
Using nondimensional variables, Eqs. (2)–(4) yields (dropping asterisks),
The velocity characteristic U_{r} is as [31]
The nondimensional boundary conditions are
We now combining the Eqs. (21) and (21) ( q = u + iv ), we get
The boundary conditions (24) and (25) are as follows:
To find the analytical solutions of the PDE (23), (26) with the boundary conditions (27), (28), then, q and θ as [32],
for ε(< < 1).
Replacing Eqs. (29) and (30) into (26) and (23), respectively, and equating harmonic and nonharmonic terms (neglect the higher poers of ε), we obtain
The corresponding boundary conditions are as follows:
Solving Eqs. (31)–(36) under the boundary conditions (37)–(38), we obtain velocity and temperature as
The skinfriction coefficient C_{f} and the local Nusselt number Nu are
Where \( {\operatorname{Re}}_x=\frac{U_rx}{v_f} \)is the local Reynolds number. Thus
Where, \( {\alpha}_1=\frac{1+{\beta}_e{\beta}_i}{{\left(1+{\beta}_e{\beta}_i\right)}^2+{\beta}_e^2},{\alpha}_2=\frac{\beta_e}{{\left(1+{\beta}_e{\beta}_i\right)}^2+{\beta}_e^2},{A}_1=\frac{\gamma {\left(1\phi \right)}^{2.5}{a}_2}{\left({m}_1+\gamma \right)\left({m}_1^2{S}_1\;{m}_1{B}_1\right)}, \) \( {a}_1=1\phi +\phi \left(\frac{\rho_s}{\rho_f}\right),{a}_2=1\phi +\phi \left(\frac{{\left(\rho \beta \right)}_s}{{\left(\rho \beta \right)}_f}\right),{a}_3=\frac{1}{{\left(1\varphi \right)}^{2.5}},{a}_4=1\phi +\phi \left(\frac{{\left(\rho {C}_p\right)}_s}{{\left(\rho {C}_p\right)}_f}\right), \) \( {a}_5=\frac{\Pr \kern0.24em {k}_f{a}_4}{k_{nf}{\left(1\phi \right)}^{2.5}{a}_1}, \) B_{1} = M_{1} + iR_{1}, B_{2} = M_{1} + i(R_{1} + n_{1}), B_{3} = M_{1} + i(R_{1} − n_{1}), \( {M}_1=\left({M}^2\left({\alpha}_1+i{\alpha}_2\right)+\frac{1}{K}\right)\;{\left(1\phi \right)}^{2.5}, \) \( {m}_1=\frac{1}{2}\left[{S}_1\;{a}_5+\sqrt{{\left({S}_1\;{a}_5\right)}^2+4\;{Q}_H\frac{k_f}{k_{nf}}}\right], \) \( {m}_2=\frac{1}{2}\left[{S}_1+\sqrt{{\left({S}_1\right)}^2+4{B}_1}\right],{m}_3=\frac{1}{2}\left[{S}_1+\sqrt{{\left({S}_1\right)}^2+4{B}_2}\right],{m}_4=\frac{1}{2}\left[{S}_1+\sqrt{{\left({S}_1\right)}^2+4{B}_3}\right], \) n_{1} = n(1 − ϕ)^{2.5}a_{1}, R_{1} = R(1 − ϕ)^{2.5}a_{1}, S_{1} = S(1 − ϕ)^{2.5}a_{1},
Results and discussion
We become aware that solutions (39) and (40) move towards the solutions for the constant surface temperature as γ → ∞ from the boundary condition (28), which gives θ (0) = 1 as γ → ∞. Further, it is worth mentioning that Eqs. (39) and (40) are reduced to those of Hamad and Pop [31] when β_{e} = β_{i} = 0, K → ∞ (absence of Hall and ion slip effects and nonporous medium) and γ → ∞ (constant surface temperature). We have to discuss the heat transfer characteristics of the flow with nanoparticles that are presented in Figs. 2, 3, and 4 and in Tables 2 and 3. According to Oztop and AbuNada [27], we have taken the range of nanoparticle volume fraction 0 ≤ ϕ ≤ 0.2 and Prandtl number Pr = 6.785. We fixed n = 10, nt = π/2 and ε = 0.001, while ϕ = 0.05, β_{e} = 0.3, β_{i} = 1, R = 0.5, K = 0.5, M = 0.5, S = 1, Q_{H} = 1_{,} and γ = 2 are varied over a range.
Figure 2a illustrates the influence of the magnetic field parameter M on the velocity distribution for Cu–water and TiO_{2}water nanofluids. The velocity across the boundary layer reduces with an increase in the magnetic field parameter M and decreases asymptotically to zero at the boundary, which leads to a reduction in the layer thickness due to Lorentz force.
For different values of the permeability parameter K, the velocity distribution on the porous wall is plotted in Fig. 2b for Cu–water and TiO_{2}–water. It is obvious that the increased values of K tend to increase the velocity on the porous wall and so enhance the momentum boundary layer thickness. Figure 2c depicts the velocity with the different values of Hall parameter β_{e} for Cu–water and TiO_{2}–water. Increased values of β_{e} tend to increase the velocity and so enhance the momentum boundary layer thickness. The effect of ion slip parameter β_{i} on velocity as observed in Fig. 2d is similar to the effect of Hall current. The opposite effect is noticed on increasing rotation parameter R, i.e., increasing the rotation reduces the momentum boundary layer thickness (Fig. 2e). Figure 2f denotes the velocity profile with effect from the heat source parameter Q_{H}. The magnitude of the velocity increases with increasing Q_{H} throughout the fluid region.
Figure 3a and b demonstrates the effect of the suction/injection parameter S on the fluid velocity. The velocity across the boundary layer decreases for S(>0) whereas increases for S(<0) for both nanofluids with nanoparticles Cu and TiO_{2}. So also as S increases, the velocity still approaches the same asymptotic value for large values of z. Thus, the thickness of the boundary layer decreases with an increase in the suction parameter S(>0). A reversal of this trend is noticed with injection parameter for S(<0). Figure 3c illustrates the velocity for an assortment of the nanoparticle volume fraction parameter ϕ. Hence, the velocity of the fluid across the boundary layer decreases with the increase of ϕ. Figure 3d represents the velocity distribution with the different values of convection parameter γ for Cu–water and TiO_{2}–water. Increased values of γ tend to increase the velocity and so accelerate the momentum boundary layer thickness.
Figure 4a displays the temperature profiles for various values of the heat generation parameter Q_{H} for both nanofluids with nanoparticles Cu and TiO_{2}. The temperature in the boundary layer region decreases with the increase in the heat generation parameter Q_{H}, and as a consequence, the thermal boundary layer thickness decreases. These side views satisfy the far field boundary conditions asymptotically, which bear the mathematical results obtained.
Figure 4b presents a typical profile for temperature with the convective parameter γ for both nanofluids. The temperature increases on increasing γ in the boundary layer region and is maximum at the surface of the plate for both nanoparticles. Thus, by escalating γ, thermal boundary layer thickness enhances. So, we can interpret that the rate of heat transfer increases with increase in convective parameter γ. Figure 4c demonstrates the variation of suction parameter S on temperature for both nanofluids. The magnitude of the temperature reduces with increasing suction parameter S and then thermal boundary layer thickness retarded throughout the fluid region. The influence of nanoparticle volume fraction parameter ϕ on the temperature is shown in Fig. 4d for Cu–water and TiO_{2}–water. The temperature profile increases with the increase in nanoparticle volume fraction parameter ϕ. Hence, the thermal boundary layer thickness improves and tends asymptotically to zero as the distance from the boundary is enhanced.
The variation of the skin friction coefficient C_{f} and the Nusselt number Nu/Re_{x} with M, K, β_{e}, β_{i}, R, γ, Q_{H}, S, and ϕ are shown in Tables 2 and 3, respectively. Table 2 shows that the skin friction coefficient C_{f} decreases with increasing parameters K, β_{e}, β_{i}, and Q_{H} whereas the skin friction coefficient increases with increasing M, R, S, γ, andϕ for both nanofluids with nanoparticles Cu and TiO_{2}. Also, from Table 3, the Nusselt number increases with the increase in all parameters γ, Q_{H}, S, and ϕ for both nanofluids with nanoparticles Cu and TiO_{2}. The variation of Nusselt number is much more considerable for nanofluids. It is to be noted that the highest heat transfer rate is obtained for Cu due to high thermal conductivity compared to TiO_{2}. These results are in good agreement with Hamad and Pop [31] (Table 4). Hence, simulation experiments have been carried out under physiological conditions, whose results can be directly compared with clinical data in the literature. System dynamics demonstrates itself to be a powerful and easytouse educational tool for biomedical engineering and sciences and is also able to explain the behavior of a physiological system.
Conclusions
Hall and ion slip effects on MHD free convective rotating flow of nanofluids in a porous medium past a moving vertical semiinfinite flat plate are investigated. The conclusions are made as the following. The resultant velocity decreases with an increase in Hartmann number, suction parameter, solid volume fraction of nanoparticles, and rotation parameter but an opposite effect is noticed for Hall and ion slip parameters, injection parameter, and permeability parameter. An increase in convection and solid volume fraction of nanoparticles led to increase the thermal boundary layer thickness but a reverse trend occurs for the heat source parameter. The skin friction coefficient increases with solid volume fraction of nanoparticles, the intensity of the magnetic field, suction parameter, and rotation parameter and reduces with Hall and ion slip parameters. Increasing values of convection parameter, heat source parameter, suction parameter, and solid volume fraction of nanoparticles are to increase the rate of heat transfer for both nanofluids Cu and TiO_{2}. The conclusions unveil that the blow of thermal convection of nanoparticles has increased the temperature distribution, which helps in destroying the cancer cells during the drug delivery process. This model for studying flow through porous media explains the development of bioconvection patterns generated by populations of gravitactic microorganisms in porous media.
Nomenclature

u, v, w Velocity components along x, y and zaxis respectively (m/s)

K_{nf} Thermal conductivity of nanofluid (W/m.K)

U_{r} The uniform reference velocity (m/s)

g Acceleration due to gravity (m/s^{2}),

k Permeability of porous medium (m^{2})

T Dimensional temperature (K)

T_{w} Constant temperature (K)

T_{∞} Free stream temperature (K)

Q Heat absorption coefficient (W/m^{2}.K)

w_{0} The normal velocity at the plate (m/s)

R Rotation parameter

M Magnetic field parameter

Pr Prandtl number

S Suction (S > 0) or injection (S < 0) parameter,

K Permeability parameter

Q_{H} Heat source parameter

B_{0} Magnetic induction (A/m)

k Permeability of porous medium (m^{2})

Re_{x} Local Reynolds number

C_{p} Specific heat at constant pressure (J/Kg.K)

Nu Nusselt number

n Frequency of oscillation (Hz)

t Time (s)

B Magnetic field vector (A/m)

E Electric field (c)

V Velocity vector (m/s)

J Current density vector (A/m^{2})
Greek symbols

β_{nf} Coefficient of the thermal expansion of nanofluid (K^{1})

Ω Angular velocity (r/s)

θ Nondimensional temperature

γ Convective parameter

τ Skin friction

α_{nf} Thermal diffusivity of the nanofluid (WmK^{1})

(ρβ)_{nf} The thermal expansion coefficient of the nanofluid

ϕ Solid volume fraction of the nanoparticles

ν_{f} Kinematic viscosity of nanofluid (m^{2}/s)

ε Small constant quantity

σ Electrical conductivity of the fluid (S/m)

ρ_{nf} Density of the nanofluid (Kg/m^{3})

μ_{nf} Viscosity of the nanofluid (Pa s)

(ρC_{p})_{nf} Heat capacitance of the nanofluid (J K^{1}),

ω_{e} Cyclotron frequency (e/mB)

τ_{e} Electron collision time (s)

β_{i} ion slip parameter

β_{e} Hall parameter
Subscripts

f Base fluid

nf Nanofluid

s Nanosolid particles
Availability of data and materials
Data sharing is not applicable in this article as no datasets were generated or analyzed during the current study.
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Acknowledgements
The authors are grateful and express their sincere thanks to the editor, reviewers, and Team of Journal of Egyptian Mathematical Society for giving suggestions and the improvement of this paper.
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MVK carried out the problem designing, performed the computational analysis, participated in the sequence alignment, and drafted the manuscript. AJC participated in its design and coordination and helped to draft the manuscript. The authors read and approved the final manuscript.
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Krishna, M.V., Chamkha, A.J. Hall and ion slip effects on Unsteady MHD Convective Rotating flow of Nanofluids—Application in Biomedical Engineering. J Egypt Math Soc 28, 1 (2020). https://doi.org/10.1186/s4278701900652
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Keywords
 Hall and ion slip effects
 Heat transfer
 Porous medium
 Nanofluids
 Rotating frame
2010 Mathematics Subject Classification
 76E06
 76E07
 76S05
 81 V70
 82D80