Numerical investigation of heat transfer hall effects on MHD nanofluid flow past over an oscillatin
Journal of Thermal Engineering 2022, Vol. 8, Issue 6, pp. 757-771; doi.org/10.18186/thermal.1201859
Abstract
Keywords: Nanofluid; Oscillating plate; Magnetohydrodynamic; Radiation; Hall Parametery
Introduction
A nanofluid contains colloidal suspensions of a nanometer-sized particle which is rapidly settling in fluid and stay suspended much longer than a microparticle. With the increasing influence of microprocessors and other
electronic types of machinery, a pursuit for a more efficient heat-dissipating system has created nowadays an enigmatic career. Nanofluids are playing a major role in heat transfer. New prototypical nanofluids have to consider
*Corresponding author. *E-mail address: saralashun@gmail.com, geethamuthu06@gmail.com, nirmalswamy@gmail.com This paper was recommended for publication in revised form by Regional Editor Tolga Taner Published by Yıldız Technical University Press, İstanbul, Turkey Copyright 2021, Yıldız Technical University. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
the surface area, size, structure-dependent behavior, and boundary resistance for thermal conductivity. The heat flux is increased by the conventional method. The automobile, electrical, and electronics companies have faced the challenges to reduce the heat level in the prototype of manufacturing. The thermal conductivity increases on the accumulation ofalumina nanofluids to normal fluids. The Alumina particle regulates the pH value in a wide range. It is an eco-friendly particle that is used in water purification and cosmetics production. Oscillating flows characterize a significant feature of conventional fluid dynamics. The oscillating plate is encouraged heat and mass transfer which is attained by fluid shaking around an immovable item or shaking of a solid form in any fluid. The Al2O3 nanofluid is acted as a coolant in double tube heat exchangers. It is extensively used in ceramics, nanocomposites, catalyst support, heat transfer fluids, water-resistant additives. The numerical solution is the stability among the computational period and exactness of the solution. CongTam Nguyen et al. [1] have analyzed 36 nm and 47 nm particle size in a nanofluid. The heat and mass transmission of the vertical plate with MHD was analyzed by Muthucumaraswamy et al. [2]. Veeranna Sridhara et al. [3] reviewed Alumina nanofluid. He collected the experiment results of nanofluids which have substantially higher thermal conductivities than base fluid. The transport andthermal properties of the base fluid are converted by nanoparticles. Bhaskar Chandra Sarkar et al. [4] revealed that unsteady primary flow Hall current leads to a decrease in the amplitude of the shear stress. Lee et al. [5] experimentally inspected the thermal conductivity performance of dilute nanofluids by a transient hot-wire technique. On rotating a porous plate with chemically reactive fluid, impacts of hall current and radiation on MHD convective heat and mass transmission were contemplated by Dual pal et al. [6]. Mohammad Reza Mohaghegh [7] suggested a spectral algorithmfor the fast and competent computation of periodic flows. Siddarth Roy et al. [8]studied the heat transfer characteristics of silver/water nanofluid in a solar flat plate collector. Rajesh et al. [9] related to magnetic nanomaterial thermal flow in engineering branches and identified key development of thermal radiation heat flux in nanomaterial fabrication. Mohaghegh et al. [10] have used periodic boundary conditions exclusively for oscillation bodies. Das et al. [11] compared Copper, Alumina, and Titania nanofluid flow with Hall effects and radiation in rotating angular velocity. Veera Krishna et al. [12] deliberated Hall effects in the oscillating porous plate with a graph that was drawn using MATHEMATICA software. Dastagiri Babu et al. [13] had instructed to neglect Hall Effect with a very small value of Reynolds number and absence of electric field. He noticed that the velocity value decreases with the increasing intensity of the magnetic parameter (M). Obulesu et al. [14] studied chemical reaction, buoyancy effects of thermal and mass diffusion with Hall effects. He assumed constant heat
generation in volumetric. Hussain et al. [15] investigated the effects of Hall current and pointed out that neither energy was added nor deducted from the fluid in the electric field. Gauri Shankar Seth et al. [16]acknowledged fluid temperature and fluid velocity slowdown in ramped temperature plates instead of the isothermal plate. Sebiha Yıldız [17] has discussed the natural cooling process for reducing excess heat. He also investigated various directions at different angles of inclination for cooling a plate. Kataria et al. [18] are concerned about the heat and mass transfer of Casson fluid flow past over an oscillating plate. He analyzed the oscillating plate with ramp temperature and concentration. On the oscillating plate, Vijayalakshmi et al. [19] have explored the unchanging heat and mass flux with radiation, MHD, in presence of the chemical. Iqbal et al. [20] examined the combined reactions of radiation, Hall currents and analyzed different shapes of nanoparticles. Arifuzzaman et al. [21] considered high-speed MHD nanofluid flow with chemical reaction and radiation effect. He optimized numerical values of flow parameters and evaluated momentum and thermal boundary layer thickness. He noticed that the same order of Coriolis and viscous forces magnitude which is called Ekman layer formation near the plate.Siva Reddy et al. [22] compared the numerical values of skin friction and Nusselt number with previously published work and interpret the current values. Radha Madhavi et al. [23] have considered Alumina (Al2O3) nanoparticles with water and kerosene as the base fluid. Heat generation has been increased the heat transfer process and motion. Brinkman fluid had been chosen for the experiment by Arshad Khan et al. [24].Patel et al. [25] contemplated the effects of radiation, Hall current in an oscillating plate in a porous medium. He investigated isothermal temperature with the ramped wall temperature of the plate. He talked about MHD applications in various fields. He examined four different kinds of nanoparticles for computational.
Dharmaiah et.al. [26] have taken Titanium alloy waterbased nanofluid and a two-term analytical method applied to get a closed-form solution. Baby rani et al. [27]used Ag-water-based nanofluid and applied perturbation technique to solve nonlinear ordinary differential equations. Manjula et al. [28] carried the Dufour number with thermal radiation and chemical reaction. Balaji et al. [29] examined various cooling methods specifically the liquid cooling method with nanometer-sized particles of nanofluids. From the above literature review, they discussed the effects of particle size, the thickness of boundary layer, various nanofluid flow, different base fluid, heat reduction, MHD, radiation. The physical model and coordinate system of a problem are shown in Figure 1.A lot of applications from the industry created important attention and motivated by the above literature review. The effects of MHD nanofluid flow of an incompressible viscous fluid past an oscillating vertical plate in the presence of Hall effects and radiation have not been studied in all the above-cited papers. In this paper, alumina-water is used. To our knowledge, no attempts have been made to study the effects of MHD nanofluid flow of an oscillating vertical plate is considered in the presence of Hall effects and radiation.
Mathematical Analysis
this similarity transformation, the velocity similarity variables are taken as the core similarity variables. It is denoted by η. Thewater-based Al2O3 nanoparticles are taken as a fluid. The base fluid and the suspended nanoparticles are carried which are in thermal equilibrium. Z* and t* direct the flow. The flow far away from the plate without disruption is considered. The unstable flow of usual Boussinesq’s approximation governing equations are as follows: ρnf
the temperature surges to TW. The uniform magnetic field B0 is applied uniformly parallel to the z* axis. The radiative heat flux qr is applied in the normal direction to the plate.Thermo-physical properties of water and Alumina nanoparticles are tabulated in Table 1. The equation of continuity is ∇ ⋅ F = 0 where u*, v*, w* → denotes the components of the velocity vector F . It provides * w = 0 inflow which is satisfied by the plate everywhere. The external velocity varies inversely–linear with the distance along the surface which is known as Pseudo similarity. In
* * 2 ∂v * ∂2 v * σ nf B0 (v + mu ) μ = − nf ∂t * ∂z * 2 (1 + m2 )
where u* is the primary velocity and v* is the secondary velocity. The initial and boundary conditions of the projected problem are given by:
In the presence of thermal radiation, the viscous flow of an incompressible Al2O3 nanofluid past an oscillating vertical plate has been considered. The x* oy* the plane is taken and z*= 0. At time t ≤ 0, the plate and fluid are at the same temperature T∞. The plate has oscillated along the x* axis and the y* axis is normal for the remaining axes. Near the plate, the temperature value is expected T∞. The velocity u* = u0 v f 3 cos ( ω*t * ) is started oscillating and
∂u * μ ∂ 2 u * = nf *2 + g (ρβ)nf (T − T∞ ) ∂t * ∂z σ nf B02 (mv * − u* ) + (1 + m2 )
On introducing the following non-dimensional quantities are: 1
u0 3 U= , = , = V Z z 2 1 1 vf u0 v f 3 u0 v f 3 u*
Table 1. Thermo-physical properties of water and Alumina nanoparticles Physical Properties
5.5. × 10–6
σ f B02 v f 3 M = ρ u 2 The local radiant for the case of an optically thin gray gas is expressed by (5)
It is assumed that the temperature differences within the flow are sufficiently small such that T4 may be expressed as a linear function of the temperature. This is accomplished by expanding T4 in a Taylor series about T∞ and neglecting higher-order terms, thus T 4 ≅ 4T∞3 T − 3T∞4
By using equations, dimensionless parameter equation (3) reduces to ∂T ∂2T + 16a *σ T∞3 (T∞ − T ) ( ρ c p )nf = knf ∂t ′ ∂z * 2
By using the dimensionless parameter, equations Eq. (1), Eq. (2), and Eq. (3) leads to,
(U − mV ) M 2 ∂U ∂2U L1 = L3 2 + L4 + L2Gr . θ ∂t ∂Z 1 + m2 (mU + V ) M 2 ∂V ∂2V L1 = L3 2 − L4 ∂t ∂Z 1 + m2
ks + 2k f − 2 ϕ(k f − ks ) L6 = ks + 2k f + ϕ (k f − ks )
Where R is the radiation parameter, Pr is the Prandtl number, Gr is the thermal Grashof number, and Gr approximates the ratio of the buoyancy force to the viscous force acting. Large R signifies a large radiation effect while R→0 corresponds to zero radiation effect. The corresponding initial and boundary conditions are represented by Eq. (11), U = 0,
∂F ∂2 F F (1 + im)M 2 = L3 2 − L4 + L2Gr . θ ∂t ∂Z 1 + m2 L5
Solution Procedure
The solutions are in terms of the exponential and complementary error functions. The relation connecting the
error function and its complementary error function is as follows: erfc(x) = 1– erf(x)
Rajesh et al. [9] have been solved equations by the implicit finite-difference method of the Crank-Nicolson type. Vijayalakshmi et al. [19] changed partial differential equations into an ordinary differential equation using similarity transformation and applied the Runge-Kutta method to find a solution. Laplace transformation technique is applied in the development of time-domain fluid line models, signal processing, control systems, statistical mechanics, data mining, and machine learning. Laplace transform deals with unsteady-state difficulties of transport phenomena.The standard Laplace transformation is used to solve the major dimensionless equations Eq. (13) and Eq. (14) along with conditional equations Eq. (15).The results are explained as follows exp(2η g (b2 + i ω)t ) exp(i ωt ) erfc η g + (b2 + iω)t F= 4 + exp(−2 η g (b2 + i ω)t ) erfc η g − (b2 + iω)t
Dharmaiah G et.al. [26] calculated and tabulated the skin friction coefficient, Nusselt number. The dimensionless skin friction coefficient, rate of heat transfer are given as follows ∂F Cf =− ∂z z =0
Where fn = 2a − 2a cosh (nb) cos (2ab) + n sinh (nb) sin (2ab) (17)
g n = 2a cosh (nb) sin (2ab) + n sinh (nb) cos (2ab) ϵ (a, b) ≈ 10−16 erf (a + ib)
exp(2η a(b + d )t ) erfc c exp(dt ) η a + (b + d )t + 2d + exp(−2η a(b + d )t ) erfc η a − (b + d )t
L5 Pr R (1 + im)M 2 , b= , b1 = , L6 L5 Pr 1 + m2 L ab − L4 b1 L Gr Lb b2 = 4 1 , c = 2 , d= 3 L1 − L3 a L1 L1 − L3 a
Results And Discussion
c exp 2η abt erfc η a + bt + 2d exxp −2 η abt erfc η a − bt
exp 2η g (b + d ) t 2 erfc g b d t + + η ( 2 ) c.exp(dt ) − 2d + exp −2η g (b + d ) t 2 erfc η g − (b + d ) t 2
−n2 exp 4 exp(−a ) + f (a, b) + ig n (a, b)] + ϵ (a, b) ∑ 2 2 [ n π n =1 n + 4 a
) c exp (2η gb t ) erfc (η g + b t ) + 2d + exp ( −2η gb t ) erfc (η g − b t )
The velocity F has computed and represented by Eq. (17). Using the below formula, the complex error function is detached from real (U) and imaginary (V) parts separately. Real and imaginary parts are differentiated with initial conditions for calculating the Nusselt and Skin friction coefficient.
exp(2η g (b2 − i ω)t ) exp(−i ωt ) erfc η g + (b2 − iω)t + 4 + exp(−2 η g (b2 − iω)t ) erfc η g − (b2 − i ω)t
1 exp(2η abt ) erfc η a + bt θ= 2 + exp(−2η abt ) erfc η a − bt
The primary velocity (U), the secondary velocity (V) are taken in terms of parameters M, Gr, t, Pr, ω, η, m, R. The numerical calculations of respective equations are computed and represented in several graphs. The primary and secondary velocity profiles of Alumina – Water with coordinate is represented by the graph from Figure 2 to Figure 17. Effects of Different Parameters on The Primary and Secondary Velocity Profile. The primary velocity U decreases with an increasing value of t is shown in Figure 2, if ☐ =π, φ=0.15, Pr=0.71,
R=0.5, t=0.26 to 0.46, Gr=3, M=1, m=1.it is observed that the secondary velocity V decreases with an increasing value of time (t) in Figure 11. The primary velocity U and secondary velocity V increase with an increasing value of radiation (R) are illustrated in Figure 3 and Figure 16. The radiation increases the speediness of the fluid over the boundary layer field. The increment of solid volume fraction φ decreases the primary velocity U and secondary velocity V in Figure 4 and Figure
17. The density of fluid increases when nanoparticles are
added to the base fluid and the fluid transforms into denser. It decreases the velocity of the fluid.
In Figure 5 and Figure 15, it is noted an increase in the magnetic field parameter (M) leads to a decrease in the primary velocity U and secondary velocity V. Due to the transverse magnetic field, Lorentz force is raised with a higher M value. It has a trend to slow down fluid motion. So both velocity is decreased with increasing values of magnetic field parameter. Baby rani et al. [27] explained Lorentz force who was resisted nanofluid flow and reduced the velocity. In Figure 6, the phase angle ☐ increment from π/24 to 5π/12 reduced the primary velocity U. It is also noticed that the increase of phase angle has reduced the secondary velocity V in Figure 10. The velocity attains maximum
value if it is near a plate and the velocity decreasing with an increasing angle from the plate, finally approaches zero as z→ ∞. The primary velocity U and secondary velocity V increase with an increasing value of Grashof number (Gr) are shown in Figure 7 and Figure 13. Gr is the ratio of the thermal buoyancy and viscous force that controls a fluid. The various values of Gr contribute to increasing the buoyancy force as well as decreasing the viscous forces. The fluid velocity will increase because the viscosity decreases as well as the internal resistance of the fluid decrease. In natural convection flow, the Grashof number increases the control of the flow. In the non-appearance of the free convection, the Grashof number is zero. In the cooling problem, the
Grashof number has carried positive values. The cooling procedure is based on the Grashof number which is applied in the cooling of electronic components and nuclear reactors. In Figure 8 and Figure 14, an increment of Hall parameter (m) value had reduced in Primary velocity U and secondary velocity V. Both velocity profiles decreased if m 2 values are large, M 2 became very small then the mag(1+m ) netic field diminishes. An increase in m decreases whose active conductivity leads to magnetic restraining. The primary velocity U and secondary velocity V increase with an increasing value of Prandtl number (Pr) are represented in Figure 9 and Figure 12. An increment
of Prandtl number increase the Primary velocity U and secondary velocity V.Due to the Prandtl number increase, boundary layer thickness increases.it leads to an increase in the velocities.
decrease in the Prandtl number. Thermal diffusion has a propensity to reduce the fluid temperature. The temperature profile for different values of Pr has presented in Figure 18. The temperature profile for different values of t has presented in Figure 19. It has been found that the temperature of Alumina-water nanofluid decreased with increasing values of time t. The temperature profiles for different values of radiation parameter and solid volume fraction have shown in Figure 20. and Figure 21. It has been generated that the temperature of Alumina– Water nanofluid decreases with
Effects of Parameters on Temperature Profiles The heat transfer rate is existed high in air comparing with water by Muthucumaraswamy et al. [2]. So temperature increases while decreasing the Prandtl number. The ratio of viscosity to thermal diffusivity is called the Prandtl number. An increase in thermal diffusivity points to a
increasing values of R. The temperature profile for different values of φ has displayed in Figure 21. It has been found that the temperature of Alumina-water nanofluid increases with increasing values of solid volume fraction φ. Effects of Parameters of Skin Friction Coefficient and Nusselt Number Friction is played a major role in a lot of engineering fields such as transportation, household usage, and measurements. Skin friction is a component of drag, the force resisting the motion of a fluid across the surface of a body. Veerakrishna et.al. [12] had calculated and listed skin friction coefficient, Nusselt number, and Sherwood number. He
also revealed that skin friction increased due to an increase of urge by force and it diminished with the rise in magnetic parameter M, phase angles ω, and Grashof number. The particle size φ = 0.15 has been taken for Nusselt number and skin friction coefficient exploration.The numerical effects of solid volume fraction, radiation parameter, Prandtl number with various times on heat transfer coefficients are calculated and listed in Table.2. From Table 2, the.Nusselt number values are gradually increased with increasing time t and t radiation R. If Pr=0.71, Pr=2, Pr=3 then the Nusselt number values are increasing. Since free and forced convection, the Prandtl Number usage is high for heat transfer calculation with fluidproperties. In heat transfer, the Nusselt number is calculated to identify the heat transfer which is conduction or convection. The Nusselt number values of various solid volume fractions (☐) in the reference paper and the present study are shown in Table 3 which is decreasing with the increased values of particle size. In Figure 22, the Nusselt number increases with the increment of radiation In Figure 23, Skin friction values are increased with increasing values of Hall parameter (m). The MHD flow
Figure 23. Skin friction coefficient for different values of m.
Table 4. Comparison of the values of skin friction coefficient (Cf) R
Figure 24. Skin friction coefficient values for different t in U. with Hall current is used in the flight synchrotron. From Figure 24 and Figure 25, the Skin friction coefficient has either increased or decreased with a different time in Primary and secondary velocity. The skin friction values are compared with parameter radiation in Table 4. The time (t), Prandtl number (Pr), Grashof number (Gr), Hall parameter (m), Magnetic parameter (M), radiation (R), phase angle (ω) parameters are considered to calculate skin friction coefficient values. It is listed in Table 5 and Table 6.
Conclusion
The main exertion of the paper is to acquire the exact solution and to find the influence of Heat transfer and Hall
Figure 25. Skin friction coefficient values for different t in V. Effects for the unsteady free convective Aluminananofluid flow over an oscillating plate with the existence of thermal radiation and magnetohydrodynamic. The primary and secondary velocity and temperature existence explained.
Table 5. Variations in Skin friction coefficient values of Primary Velocity (U) t
In the probe of the oscillating plate and nanofluid flow, the highlights of concluding remarks have been summarized as followed. • The velocity of fluid increases with the increasing values of radiation parameter, Prandtl parameter, Grashof number in both primary and secondary flows. • The temperature of the fluid decreases with the increasing values of radiation parameter, time, and Prandtl parameter. But increasing solid volume leads to an increase the temperature. • The Nusselt number values decrease with the increasing value of particle size. • In primary velocity (U),the skin friction values are increased with increasing values of radiation, Hall parameter, Magnetic parameter, Prandtl number. In secondary velocity (V), the skin friction value is increased when M and ? are increased.
Nomenclature
List of symbols B0 Constant applied magnetic field (Wbm-2) Cp Specific heat at constant pressure (J kg-1 K-1) Cf Coefficient of Skin Friction E Electric field (kJ) F Complex Function g Gravity acceleration (ms-2) Gr Thermal Grashof number M Dimensionless magnetic field parameter m Hall Parameter Nu Nusselt Number n Dimensionless frequency Pr Prandtl number q–w Dimensional heat flux from the plate t* Time(s) t Dimensionless time (s)
Table 6. Variations in Skin friction coefficient values of secondary velocity (V). t
T Local temperature of the nanofluid (K) Tw Wall temperature (K) T∞ The temperature of the ambient nanofluid (K) u*,v*,w* Velocity components along x*, y*, z* axes U,V,W Dimensionless velocity components x,y,z Cartesian coordinates Greek symbols α Thermal diffusivity (m2 s-1) β Thermal expansion coefficient (K-1) ε Dimensionless small quantity (<<1) φ Solid volume fraction of the nanoparticles ρ Density k Thermal conductivity (m2s-1) μ Dynamic viscosity (Pa s) ϑ Kinematic viscosity (m2 s-1) θ Dimensionless temperature η Pseudo-similarity variable
Superscript – Dimensional quantities Subscripts f Fluid nf Nanofluid s Solid
Data Availability Statement
The authors confirm that the data that supports the findings of this study are available within the article. Raw
data that support the finding of this study are available from the corresponding author, upon reasonable request.
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Conflict Of Interest
The author declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
Ethics
There are no ethical issues with the publication of this manuscript.
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SARALA, S.; GEETHA, E.; NIRMALA, M. Numerical investigation of heat transfer hall effects on MHD nanofluid flow past over an oscillatin. Journal of Thermal Engineering 2022, Vol. 8, pp. 757-771. https://doi.org/10.18186/thermal.1201859

