Intelligent Automation & Soft Computing DOI:10.32604/iasc.2021.015982 | |

Article |

Exact Analysis of Second Grade Fluid with Generalized Boundary Conditions

1Department of Science & Humanities, National University of Computer and Emerging Sciences, Lahore Campus, 54000, Pakistan

2Department of Mathematics, University of Management and Technology, Lahore, 54000, Pakistan

3Institute for Groundwater Studies (IGS), University of the Free State, Bloemfontein, 9301, South Africa

4Department of Mathematics, Cankaya University, Ankara, 06790, Turkey

5Institutes of Space Sciences, Magurele, Bucharest, 077125, Romania

6Institutes of Sciences, Siirt University, Siirt, 56100, Turkey

7Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan

*Corresponding Author: Dumitru Baleanu. Email: dumitru@cankaya.edu.tr

Received: 17 December 2020; Accepted: 28 January 2021

Abstract: Convective flow is a self-sustained flow with the effect of the temperature gradient. The density is non-uniform due to the variation of temperature. The effect of the magnetic flux plays a major role in convective flow. The process of heat transfer is accompanied by mass transfer process; for instance condensation, evaporation and chemical process. Due to the applications of the heat and mass transfer combined effects in different field, the main aim of this paper is to do comprehensive analysis of heat and mass transfer of MHD unsteady second-grade fluid in the presence of time dependent generalized boundary conditions. The non-dimensional forms of the governing equations of the model are developed. These are solved by the classical integral (Laplace) transform technique/method with the convolution theorem and closed form solutions are developed for temperature, concentration and velocity. Obtained generalized results are very important due to their vast applications in the field of engineering and applied sciences. The attained results are in good agreement with the published results. Additionally, the impact of thermal radiation with the magnetic field is also analyzed. The influence of physical parameters and flow is analyzed graphically via computational software (MATHCAD-15). The velocity profile decreases by increasing the Prandtl number. The existence of a Prandtl number may reflect the control of the thickness and enlargement of the thermal effect.

Keywords: MHD second grade fluid; dynamical analysis; time dependent velocity; porous medium; Laplace transformation; radiation effect

Numerous engineering practices such as drag reduction, transpiration cooling, thermal retrieval of oil, and thermite welding demand a radical knowledge of heat transfer during viscous and non-Newtonian fluids’ flow in diverse geometries. Therefore, various attempts are used to analyze and update the existing investigations corresponding to the heat transfer phenomenon. Convective flow is a self-reliant flow with the effect of the heat transfer. The influence of magnetic flux plays a significant role in convective flow. In the literature, different theories are made to see the phenomenon of heat transfer analysis. Radiation, convection and conduction are three modes of heat transfer. Convection can be defined as heat transfer by the substance motion which may be air or water. It plays a central role in creating the weather clause on the plant. Convection consists of forced and natural convection. It happens when the medium divide the heat energy and on its own move. Heat is disbursed when air is pushed by a fan, sometime heat advection referred to the forced convection. Heat is animated to distress by means of itself hotness become cause of natural convection by means of shifting source heat. In mixed convection the dualistic natures, forced and natural recurrently are transpiring collectively. When external force is applied it will also moves. This is referred as mixed convection. Heat and mass are related to each other as heat transfer rate depends on mass transfer and mass transfer further depends upon concentration difference.

Tan and Masuoka [1] have analyzed the heat transfer on Second-order fluid in the porous medium. Aldose et al. [2] have investigated the vertical plate with mixed MHD convection implanted on a porous medium. The continuity interface condition for a cylinder embedded in a porous medium has been studied by Rashidi et al. [3]. The oscillating flows of rotating Second-grade fluid has been discussed in Imran et al. [4]. Exact solutions for accelerated flows of a rotating second-grade fluid have been investigated in Khan et al. [5]. Bilal et al. [6] have analyzed the flow of Second-grade fluid generated by an accelerating flat plate. Farhad et al. [7] have discussed the closed structure for Second-grade fluid’ over a swaying vertical plate. For more details see [8–15]. Exact solutions serve in multiple ways for the specialized relevance of the streams [16–18]. Differential, rate, and integral fluids are basic categories of non-Newtonian fluid. The straight forward kind of differential fluid discussed the ordinary stresses known as the second-grade fluid. Relatively to the Newtonian fluids, a higher and complicated mathematical system exists for the non-Newtonian fluids. In 2010, Nazar et al. [19] have studied the second problem of stokes for second-grade fluids. In this model, the Laplace transform techniques helped us to acquire accurate solutions. Recently, Farhad et al. [20] have discussed the MHD fluid as electrically conducting and passing through the porous medium [21]. Researchers have discussed the different fluids on MHD free convection radiative stream over various geometries [22–30]. Ali et al. [31] have investigated the exact solution for MHD second-grade fluid in porous surfaces. The study of flow in which liquids are electrically leading within sight of attractive fields is known as MHD. The principle of the MHD is helpful for the flow against laminar to turbulence. The MHD within view of diffusion and radiation are applications of the mass and heat transfer. This paper aims to research the convection flow of the second-grade fluid using the generalized boundary condition to get a definite solution using Laplace transforms.

Let us consider incompressible MHD second grade fluid with constant temperature saturated with porous surface lying on the plate. Suppose

Subject to the following appropriate conditions:

We introduce the dimensionless variable for the simplification of governing Eqs. (1–4) of MHD second grade fluid:

After substituting the dimensionless variables in Eqs. (1–4), we have dimensionless governing equations:

with conditions:

Applying Laplace transformation to Eq. (8) with suitable initial condition on concentration gives:

The required solution of second order differential Eq. (10) with the help of (9) on concentration is given by

Then, have

The Sherwood number is given in Siddique et al. [28]:

Applying the Laplace transformation to Eq. (7) with suitable initial condition on temperature gives:

The solution of the second order differential Eq. (15) with the help of Eq. (9) on temperature is given by

Then, we obtain

Nusselt number is given by Siddique et al. [28]:

Applying the Laplace transformation to Eq. (6) with suitable initial condition on velocity yields:

The general solution of Eq. (20) with the help of Eqs. (11) and (16) with boundary conditions on velocity is given by:

The above equation can be presented in suitable form as:

where

Then, we reach

The Eq. (23) is the expression for velocity with generalized boundary conditions on temperature, concentration and velocity.

In Eq. (22), we consider

Then, we get

Consider the different cases of

3.4.1

The solution of Eq. (24) using Heaviside unit step function can be written as:

3.4.2

The required solution of Eq. (24) is given as:

3.4.3

The solution of Eq. (24) using

3.4.4

The solution of Eq. (24) using

Where

Eq. (29) explores the required exact solutions of the second grade fluid for the cosine and sine oscillation respectively.

• In this case, if second grade parameter

• In the void of magnetic field

• If we neglect the effect of temperature

In this paper, we investigated the unsteady uniform free convection flow (stream) of the second-grade fluid passing through an accelerated limitless plate with constant temperature inserted in the permeable medium. Analytical solutions can be achieved through the Laplace transform method. The graphical representation helps us to show the influences of different physical parameters such as

The analysis of heat transfer on the MHD flow of generalized second grade in porous medium was investigated through Laplace transformation to get the closed form solutions. The graphical approach was used to discuss the influence of parameter on velocity. The following points were extracted from the instant study

i) Increasing the value of

ii) Increase velocity field when

iii) Enhance the fluid motion by existence of free convection.

iv) Velocity increase as an increase of

Acknowledgement: The authors are highly thankful and grateful for support of this research article.

Funding Statement: The authors received no specific funding for this study.

Conflicts of Interest: The authors declare that they have no conflicts of interest to report regarding the present study.

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