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A Prabhakar Fractional Approach for the Convection Flow of Casson Fluid Across an Oscillating Surface Based on the Generalized Fourier Law

Convection Across Oscillating Abstract: In the present work, an unsteady convection ﬂow of Casson ﬂuid, together with an oscillating vertical plate, is examined. The governing PDEs corresponding to velocity and temperature proﬁle are transformed into linear ODEs with the help of the Laplace transform method. The ordinary derivative model generalized to fractional model is based on a generalized Fourier law. The solutions for energy and velocity equations are obtained after making the equations dimensionless. To check the insight of the physical parameters, especially the symmetric behavior of fractional parameters, it is found that for small and large values of time, ﬂuid properties show dual behavior. Since the fractional derivative exhibits the memory of the function at the chosen value of time, therefore the present fractional model is more suitable in exhibiting memory than the classical model. Such results can be useful in the ﬁtting of real data where needed. In the limiting case when fractional parameters are taken β = γ = 0 and α = 1 for both velocity and temperature, we get the solutions obtained with ordinary derivatives from the existing literature.


Introduction
Casson proposed the Casson fluid model in 1959 to predict flow patterns of suspended pigment-oil mixtures. These fluids are known as viscoelastic fluids, and they have a broad range of uses in the drilling process. Honey jelly soup, concentrated fruit juices and artificial fibers are all forms of Casson fluid [1]. The Casson fluid model has many uses in biomechanics and processes. In comparison to previous viscoelastic models, the Casson fluid model is more suitable for studying materials such as blood, chocolate, and other rheological details. At zero shear rate, Casson fluid is a shear-thinning liquid with infinite viscosity. The fluid behaves like a solid when the yield stress is greater than the shear stress [2,3]. Based on generalized Fourier's and Fick's laws, as well as mass and heat transfer, new fractional derivative model Casson fluid has been developed by Sheikh et al. [4]. A new method for solving the fractional generalized Casson fluids model of the Caputo fractional operator has been developed by Ndolane [5]. Arif et al. [6] deliberated applications of motor oil using a fractional model of Casson fluids of ramped wall temperature. Ali et al. [7] described Wright's function solutions for time fractional Casson fluid flow in free convection. Raza et al. [8] conducted thermal movement of conservative Casson nanoparticles through ramped temperature because of an infinite perpendicular plate by fractional derivative. Khan et al. [9] examined Casson fluid fractional derivative generalized unsteady flow because of the infinite plate. Saqib et al. [10] expressed nonlocal fractional model of BTF incorporating hybrid nanoparticles with symmetric MHD channel flow.
Oscillating flow is a well-known reason for higher mass and heat transfer. Oscillating movement was realized moreover by fluids vibration around a fixed article. While fluids vibration around a fixed object needs more energy. Oscillating flows are widely used in piston engines, pulsating burners, heat exchangers, cryogenic refrigeration, chemical reactors, and in numerous applications in the atmosphere military and industry fields [11,12]. Song et al. [13] discussed the significance of exponentially Darcy's and heating law for second grade fluid flow with oscillating plate by utilizing the Atangana-Baleanu time fractional operator. Ali et al. [14] analyzed the flow of second grade fluids on an oscillating perpendicular plate for unsteady free convection closed arrangement solutions. Haider et al. [15] deliberated heat transfer of micro polar hybrid nanofluids through an oscillating vertical plate of Newtonian heating with thermal radiation. Shah et al. [16] observed thermal analysis of second grade fluids over oscillation perpendicular flat plate by consuming time fractional Caputo-Fabrizio derivatives. The impacts of heat generation and thermal diffusion on magnetohydrodynamics (MHD) nanofluids flow through an oscillating vertical plate with permeable medium, as addressed by Sheikholeslami et al. [17].
It is observed that the numerical model of integer-order derivative, counting the nonlinear model, does not work satisfactorily in numerous cases. Fractional calculus has many applications in the field of viscoelasticity, signals processing, electromagnetics, fluid mechanics, and optics. It has been utilized to illustrate the model physical and designing forms that are found by fractional differential conditions. Fang et al. [18] discussed Caputo fractional derivatives along with applications of time-fractional distribution equations through a fast technique for variable-order. Dassios and Baleanu [19] introduced Caputo's fractionaldifferential equation for singular linear structure with an optimal solution. Ali et al. [20] described hybrid nanofluids along with constant comparative Caputo fractional derivatives of power laws memory because of a pressure gradient. Baleanu et al. [21] studied mathematical displaying of the human liver along with Caputo-Fabrizio fractional derivatives. Alizadeh et al. [22] analyzed the transitory reaction of the equivalent RCL circuit by utilizing Caputo-Fabrizio fractional derivatives. A non-linear fractional system model of dengue illness under Caputo-Fabrizio derivatives was discussed by Shah et al. [23]. Abdeljawad et al. [24] deliberated ABC-fractional analysis of approximately generalized logistic models. Thabet et al. [25] investigated transference dynamics of COVID-19 numerical models under ABC-fractional derivatives. Atangana-Baleanu fractional derivatives are a new application in designing of ABC-fractional mask image processing conversed by Ghanbari and Atangana [26]. Benchohra et al. [27] analyzed the Hilfer-Katugampola fractional derivative terminal value problem for differential equations. Using the Caputo-Fabrizio derivative, the unsteady flow of fractional fluid between two parallel walls with arbitrary wall shear stress was discussed by Saqib et al. [28].
The Prabhakar work is named after Indian mathematician Tilak Raj Prabhakar, who proposed a generalization of the Mittag-Leffler function to three parameters in 1971. The utilization of Prabhakar administrators with specific fractional coefficients could be a helpful path for a decision of satisfactory numerical models that settled on a decent arrangement among hypothetical and trial results [29,30]. Elnaqeeb et al. [31] debated the carbon nanotube nanofluid with natural convection flow and Prabhakar-like thermal transportation. Shah et al. [32] deliberated generalized thermal transport and natural convection streams of Prabhakar-like fractional of Maxwell fluids. Dynamics and stability of Prabhakar fractional differential structures that are integrodifferential and neutral were regularized by Eshaghi et al. [33]. Tanveer et al. [34] designated the Prabhakar fractional model used to study the thermal behavior of viscous carbon nanotube nanofluid in free convection flows with generalized thermal transport. Alidousti [35] investigated the fractional differential classifications through the Prabhakar derivative with a stable field. Derakhshan [36] defined, in the context of Hilfer-Prabhakar derivatives, a new numerical procedure for solving variable order fractional integrodifferential equations. Prabhakar fractional derivatives of non-Newtonian fluid in convection channel with hybrid nanoparticles were discussed by Asjad et al. [37]. Basit et al. [38] introduced various nanoparticles of convection flow of fractional second grade fluid subjects to the non-uniform velocity at the edge. Unstable Casson nanofluid of thermal transport flow generalized with Prabhakar types Mittage-Leffler kernel was analyzed by Wang et al. [39]. Sene and Srivastava [40] discussed the generalized Mittag-Leffler input stability of the fractional differential equations. Modeling, analysis, and solutions of time-fractional models for COVID-19 were expressed by Iyiola et al. [41].
Previously, Khalid et al. [42] described their model for unsteady Casson fluid across the oscillating vertical plate with constant temperature and found their results for small-time values. The present investigation is focused on the study of the Prabhakar fractional model of Casson fluid through generalized Fourier law for oscillating surface that controls the momentum and thermal boundary surface with Laplace transform methods. In this paper, the governing equations for non-Newtonian fluid are generalized to Casson fluid, and the governing equations are found by constitutive laws after making them dimensionless. Furthermore, analytical solutions for the fluid properties temperature and velocity are found using the Laplace transform approach. For insight on the behavior of flow particles, some graphs are plotted in the graphical section.

Preliminaries of Fractional Calculus
Definition 1 (The Prabhakar kernel). Function [43]. For t ∈ R, is known as the Prabhakar kernel.
where α, β, γ, ν are the elements of complex number C.
Definition 4 (The regularized Prabhakar derivative). Let 0 < β ≤ n, where n belongs to Z and h ∈ AC n (0, b). The regularized Prabhakar derivative is defined as [43,44] where h (n) represents the nth differential of h(t) and AC n (0, b) represents the set of functions h(t) with real values. Laplace transform of the Equation (5) is give by

Problem Formulation
Consider the heat transform of Casson fluid flowing past, an infinite vertical smooth plate y > 0, where y is the coordinate measured in the surface's normal direction. Both the plate and the fluid are assumed to be at rest with a constant temperature T ∞ at the start of the simulation t = 0. In its plane, the plate start to oscillate y = 0 at time t = 0 + , according toṼ where the constantŨ is the amplitude of the plate oscillations, H(t) is the unit step function, i is the unit vector in the vertical flow direction, and ω is the frequency of oscillation of the plate. At the same time, the plate temperature is raised to T w . Which is then maintained at the same level ( Figure 1). We assume that the rheological equation of state for an isotropic flow of Casson fluid can be written as [42] x axis − Thermal Momentum whereπ =ẽ ijẽij andẽ ij is (i, j) ih component of deformations rate.π is a product of component deformation rate,π c is the critical value of this product based on the non-Newtonian model,μ B is the plastic dynamic viscosity of the non-Newtonian fluid, andp y is yield stress of the fluid. We derive the following set of partial differential equations under these conditions, and the energy equations of the viscous dissipation factor is assumed to be ignored: Momentum equation: Energy equation: Generalized Fourier's law for thermal flux: where C D γ α,β,a is the regularized Prabhakar derivative defined [30,31]. Constraints: u → 0,T →T ∞ as y → ∞.

Results of the Problem
In this section, the Prabhakar derivative is used to construct a fractional model of the physical system.

Temperature Field's Outcome
By using the Laplace transform of Equations (18) and (19), we get By introducing Equation (24) into Equation (23), we get satisfy the following constraints: With the general solution of Equation (25) We cannot find the inverse Laplace transform directly from the table of Laplace transform. Therefore, Equation (27) is expressed in series expression as follows: Taking the Laplace inverse transform of Equation (28), we havẽ which satisfy the boundary condition.
For accuracy and validation of temperature and velocity, Figures 2 and 3 are presented. These figures portrayed the comparison between classical solutions obtained by Khalid et al. [42] and the present results when fractional parameters β = γ = 0 and α = 1. It is found that our general results in the limiting form are validated and correct. Figures 4 and 5 depict the comparison between classical solutions obtained by Khalid et al. [42] and the present results for different values of fractional parameters. The temperature of the fluid for different values of fractional parameters is obtained by considering small and large values of the time. It is evident from the figures that for a small time, the fluid properties can be increased, and for a large time, fluid properties can be decreased.Moreover, it is concluded that the fractional parameters control the boundary layer thickness and show the dual behavior for different values of the time. In Figure 6, we have another comparison that shows maximum velocity can be achieved in the mainstream region away from the plate with the larger values of fractional parameters. Figures 7 and 8 are plotted for the influence of fractional parameters on temperature and velocity, respectively. The fractional approach is responsible for exhibiting the memory of the fluid properties. It is clear from the figures that for smaller fractional parameters that maximum memory can be achieved at the present time, and for larger values of fractional parameters, the boundary layers approach the classical model. However, it is concluded that the fractional solutions show behavior for a different time. Therefore, we can say that the fractional approach has an advantage in controlling the boundary layers, and this fact can be used in the fitting of real data. As we increase the value of Gr in Figure 9, the velocity increases. This is because when Gr increases, the buoyancy forces become much greater, resulting in more convection and ultimately velocity increases.
When the value of Pr is increased in Figure 10, the temperature drops. Physically, increasing the value of Pr makes the fluid thicker, resulting in the lowest thickness of the thermal boundary layer. Figure 11 depicts the effect of the velocity profile on Pr. Velocity decreases as Pr increases. The temperature and velocity profiles for different larger values of Prandtl number Pr are shown in Figures 12 and 13 when the other parameters are fixed. It is observed that the temperature of the fluid decreases with increasing Prandtl number and velocity of fluid increases with increases of the values of Prandtl number Pr. The thickness of the thermal boundary layer is found to be a minimum near the plate. Fluids with a high Pr number have a higher viscosity and low thermal conductivity limits because of thicker fluid. It is concluded that the Prabhakar fractional model of temperature and velocity field holds for smaller and larger Prandtl numbers. Figure 14 depicts the graphical results for the fractional parameter α and phase angle ωt. The fluid appears to be oscillating between 0 and 1. These variations near the plate are extreme and rise for further values of independent variable y. We have concentrated more on such results to illustrate them on the values of α = 0.2, 0.4, 0.6, 0.8 and ωt = 0, π 4 , π 2 and π.

Conclusions
The analytical solutions of fractional partial differential equations that emerge in