Significance of Nonsimilar Numerical Simulations in Forced Convection from Stretching Cylinder Subjected to External Magnetized Flow of Sisko Fluid

Cui, Jifeng; Farooq, Umer; Jan, Ahmed; Elbashir, Murtada K.; Khan, Waseem Asghar; Mohammed, Mogtaba; Alhussain, Ziyad Ali; Ul Rahman, Jamshaid

doi:https://doi.org/10.1155/2021/9540195

Journal of Mathematics

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Abstract Introduction Conclusion Data Availability Conflicts of Interest Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2021 | Article ID 9540195 | https://doi.org/10.1155/2021/9540195

Significance of Nonsimilar Numerical Simulations in Forced Convection from Stretching Cylinder Subjected to External Magnetized Flow of Sisko Fluid

Jifeng Cui,¹Umer Farooq,²Ahmed Jan,²Murtada K. Elbashir,^3,4Waseem Asghar Khan,⁵Mogtaba Mohammed,⁵Ziyad Ali Alhussain,⁵and Jamshaid Ul Rahman⁶

Academic Editor: Qingkai Zhao

Received18 Jul 2021

Revised18 Aug 2021

Accepted31 Oct 2021

Published24 Nov 2021

Abstract

The practice of flowing effort is participating in various industries especially in nutrition productions all around the world. These fluids practices are utilized extensively in nutrition handling productions by making use of sticky liquids to produce valuable food manufactured goods in bulk. Nevertheless, such productions ought to guarantee that involved equipment such as pipelines are maintained clean as well as are cleared out for the efficient movement of fluids. The nonsimilar characteristics of involuntary convection from circular cylinder stretching in the axial direction subjected to an external flow of Sisko fluid characterized by the freely growing boundary layers (BL) are presented in this research. A circular cylinder is submerged in a stationary fluid. The axial stretching of the cylinder causes external fluid flow. The magnetic force of strength is enforced in the transverse direction. Because of the fluid's high viscosity, frictional heating due to viscous dissipation is quite significant. The flow is three dimensional but with no circumferential variations. The governing equations for axisymmetric flow that include the mass balance, -momentum, and heat equation are modeled through conservation laws. The dimensionless system is developed by employing appropriate nonsimilar transformations. The numerical analyses are presented by adapting local nonsimilarity via finite-difference (FDM)-based MATLAB algorithm bvp4c. The characteristics of dimensionless numbers are determined by graphs that are plotted on momentum and heat equations. The nonsimilar simulations have been compared with the existing local similar solutions. Fluid velocity is increased as the material and curvature parameters are increased, resulting in improved heat transfer. The deviation in skin friction and local Nusselt number against the various dimensionless numbers is also analyzed.

1. Introduction

The evaluation of non-Newtonian fluids won plenty of attention between the scholars in past because of its large-scale applications in metal spinning, polymer extrusion, and fabrication fields. Since a massive number of non-Newtonian fluids exist, therefore, a bunch of fluid simulations is planned to examine the material characteristics of these fluids. As the power law or generalized Newtonian fluid model is the best relevant model to portend the mindset of non-Newtonian fluids. The procedure of liquid by means of transport in food stuff productions throughout the globe is of fantastic importance. Extremely nutrition handling productions make use of sticky liquids to produce valuable food manufactured goods in majority. Nevertheless, such productions ought to guarantee that involved kit such as pipelines are maintained clean as well as are cleared out for the efficient movement of liquids. The liquids are injected in network which results in friction over the wall up of the tube [1, 2]. Movement qualities are the basis of the mass shifts taking place in food stuff productions, e.g., honey, which is utilized in medication and diets due to its biological produce found from nectar, and patients of all age group use these stuffs on regular basis in all seasons. Furthermore, vitamins, high value minerals, and proteins are also components of honey. Consequently, the flow performances of honey at all times have a fascinating subject matter. Honey is also widely utilized as a food preservative and food component as well. The honey found from beehives and scrutinizes has honeycomb, pollen, and other unattractive ingredients. The ejection of these substances is crucial for a generally nice value product alongside with enhancing shelf life. In nutrition industries, honey goes through various procedures, prior to being jam-packed into cans and containers, such as central heating and purification to remove additional waste materials. Furthermore, the humidity substance would be monitored to reduce the risks of fermentation [1–3].

When the shear rate becomes very low or high these fluids stop to inspect the flow characteristics, the Sisko fluid model is one of the numerous non-Newtonian fluid models, and it has vast industrial, mechanical, and automobile engineering applications such as lubricating oil, food products, and cementitious slurry. It can be used as an antiwear agent, extreme pressure agent, and corrosion inhibitor and inhibit seizure under high loads and temperatures. In recent years, scholars examined Sisko fluid with different physical hypotheses over various geometries. Sisko [4] worked on greases that depict non-Newtonian behavior in nature having high viscosity with low shear rate and vice versa. Alyiuldiz et al. [5] reviewed the thin film Sisko fluid flow on the top of a moving belt and acquired analytical solutions by employing the homotopy method (HAM). Nadeem and Akbar [6] examined the peristaltic Sisko fluid flow in the uniform inclined duct through. Khan et al. [7] modeled nonlinear equations of incompressible Sisko fluid through a pipe and obtained both approximate and numerical results by using HAM and FDM, respectively. Munir et al. [8] studied the characteristics of 3D, steady flow of Sisko fluid which is triggered due to bi-directional stretching. Malik et al. [9] implored thermal transport of the flow of Sisko fluid across a cylinder. Casson 3D fluid flow subjected to magnetohydrodynamic (MHD) past on top of a permeable surface was numerically viewed by Nadeem et al. [10]. Mustafa and Khan [11] presented MHD drift of Casson nanofluid on top of a nonlinearly expanding cylinder. Farooq et al. [12] inspected the MHD flow of non-Newtonian fluid across a stretching surface. Rashidi et al. [13] inspected numerically the impacts of slip factor, magnetic interaction, and temperature gradient across a rotating disk. Malik et al. [14] analyzed the thermal transport of fluid flow across a cylinder with the consequences of magnetic force. The utilization of numerical procedures in hydraulics networks and various engineering applications can be seen in [15, 16].

During the experiments, “the fluids are considered in motion, during motion fluid particles, which transforms some of their kinetic energy (K. E) into thermal heat due to viscosity, and the process is irreversible,” and this process is mentioned as viscous dissipation. Brikman [17] investigated viscous dissipation and its properties. He discussed the temperature distribution of the Newtonian fluid in a linear round duct and illuminated the results that were produced in the locked region. Abd El-Aziz [18] measured the outcomes of the viscous dissipation for Sisko fluid flow along with a semi-infinite stretching sheet. Saleem and Nadeem [19] examined the viscous dissipation influences over a vertically rotating cone by applying HAM. Moreover, compilations of publications on viscous dissipation can be found in [20–26].

Mathematical models of physical procedures in fields of wave dynamics, fluid mechanics, biological kinetics, diffusion, and transportation problems are driven by nonlinear partial differential equations (PDEs). The governing PDEs of a BL fluid flow are transformed into dimensionless PDEs. The considerable mathematical difficulty is associated with the solutions of these BL equations of fluid flow mainly because of their nonlinearity. Several approximate analytical and numerical methods have been established to tackle these equations. Although the local nonsimilar method (LNSM) presented by Sparrow and Yu [27] is more accurate and efficient than other techniques, it is only an approximate method since PDEs are reduced to ODEs after some degree of approximation truncation. Lately, several authors have conducted extensive research on nonsimilar flows primarily using the approach of LNSM [28–34].

In this study, the magnetized flow of Sisko fluid over a circular cylinder stretching in the axial direction is investigated. The nonsimilar dimensionless system is numerically simulated by employing LNSM up to the second level of truncation via bvp4c. The drawback of local similarity method (LSM) is the governing PDEs that were obtained after the transformation has similar terms. To overcome this drawback, Sparrow et al. [35] used the method of local nonsimilarity. Impacts of the emerging dimensionless parameters, e.g., material parameter, curvature parameter, Prandtl number, and magnetic parameter, are studied on the important numbers in thermal transport analysis such as frictional drag and local Nusselt number and profiles of velocity and temperature through tables and graphs. Practical implications of this study can be found in [36–41].

2. Convection Equations for Transport Analysis

Consider a circular cylinder, which is submerged in a stationary fluid. The forced external flow is initiated due to the cylinder expansion in the axial direction with the velocity U(x) = cx, where c is time constant. The flow is steady, incompressible, and axisymmetric. The transverse magnetic field with strength is imposed in r-direction. Induced magnetic and electric fields are ignored. Frictional heating due to viscous dissipation is significant because of the high viscosity of the fluid. Therefore, the viscous shear stress impact is incorporated in the energy equation.

Problem geometry is indicated in Figure 1.

Using the assumptions stated above, the convection equations are given by [42]under boundary conditionswhere are the components of fluid velocity along the x-axis and r-direction. The material constants at high shear rate viscosity are and which represent an electrical conductivity, power-law index denoted by , and is the consistency index. The magnetic field , the fluid density is , indicates the thermal diffusivity, and , , and are the specific heat, wall, and ambient temperature.

To develop a nonsimilar flow, introducing a new variable and such that

Using (5) in (1)–(4), we get the following dimensionless nonsimilar system:

Nonsimilar boundary conditions arewhere curvature parameter , magnetic number , Reynold number , material parameter , Eckert number , and Prandtl number are the dimensionless quantities.

Surface friction coefficient and Nusselt numbers arewhere surface shear stress, is the surface flux, and

Equations (9) and (10) in dimensionless forms are

3. Local Nonsimilarity Method

Assuming <<1 and the right-hand side of equations (6) and (7), equal to zero. Therefore, the equations of local similarity are

Under boundary conditions,

To obtain 2^nd level truncation, differentiate equations (6) and (7) with respect and introduce new functions and put the derivatives of the introducing function with equal to zero as . The transformed equations aresubjected to the conditions

4. Forced Convection Analysis

The behavior of various dimensionless numbers is implored to study the variations in the thermal transport analysis. The significance of the nonsimilar modeling and its simulations are compared, and results are presented in Tables 1 and 2. Table 1 is the comparison with the existing works of Malik et al. [42] and Rangi and Ahmad [43]. Results of skin friction for varying the curvature parameter values are shown in Table 1. Table 2 reveals the difference between the current results with the published articles of Malik et al. [42] and Akbar et al. [44] for several values of magnetic number. Table 3 describes the impact of increasing , , and on frictional coefficient. It is noticed that friction increases by enhancing numerical values of , , and . Table 4 illustrates that increasing and increases the rate of thermal transport; however, the impact of increasing is to decline the rate of heat transfer. Figure 2 describes that increase in magnetic force boosts the Lorentz force which resist the fluid flow. Thus, a rise in the Lorentz force reduces the velocity field.

Curvature parameter behavior against velocity profile is portrayed in Figure 3. The curvature parameter is the ratio of boundary layer thickness to the cylinder’s radius. The increasing curvature curtails the cylinder’s diameter. The smaller radius implies that the contact surface of the cylinder is less; therefore, it will provide less struggle to fluid flow. As a result, the fluid accelerates, and it is determined that the flow escalates by boosting the curvature parameter. In Figure 4, the property of on the velocity field is examined. The fluid velocities increase for significant values of the material parameter; physically, it retains because when the material parameter has significant values, viscous effects reduce, so it suggests a reduced amount of resistance to the fluid motion. In Figure 5, effects of the Eckert number are studied. The Eckert number relates the kinetic energy and heat enthalpy difference of the fluid flow. There is a direct link between the Eckert number and kinetic energy. So, rise in the Eckert number provides an increment in the kinetic energy; as a result, the thermal transport increases.

Figure 6 displays the effect of the curvature parameter on thermal distribution. The enlarged curvature parameter contracts the cylinder’s radius, so as an outcome, velocity as well as the kinetic energy which boosts the thermal transport enhances. Figure 7 assess the behavior of Prandtl number; it relates fluid viscosity with the thermal conductivity. Therefore, it evaluates the relation between momentum and the thermal transport capacity of the fluid. Enhancement in the Prandtl number reduces the thermal dissipation and the temperature distribution falls due to the weak heat transfer rate. This shows that strengthening the Prandtl number plunges down the temperature distribution.

5. Conclusion

In this study, the BL flow of Sisko fluid across a stretching cylinder with the impacts of viscous dissipation and the magnetic field is evaluated numerically. The numerical simulations of the nonsimilar model show that the rise in material parameter decays the viscous forces and, in result, enhances the flow rate, and the increment in the curvature parameter lift flow rate, while the augmentation in the magnetic field parameter, enhancing the resistance force which diminishes the velocity profile. Rise in dimensionless curvature and viscous dissipation parameters raises the thermal profile of the fluid. An increment in the Prandtl number decreases the thermal dissipation which declines the temperature distribution because of low heat transfer rate. Rising values of the Eckert number upsurges the temperature distribution profile. Also, increasing estimations of material and curvature parameters enhances the temperature profile. Friction forces extend for greater values of , M, and γ. Increment in γ, and gives enhancement of the Nusselt number.

Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

The authors extend their appreciation to the deputyship for Research and Innovation, Ministry of Education in Saudi Arabia, to fund this research work through the project no. IFP-2020-20.

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Copyright © 2021 Jifeng Cui et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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