ANALYSIS OF SECOND-GRADE FLUID FLOW IN POROUS...
Transcript of ANALYSIS OF SECOND-GRADE FLUID FLOW IN POROUS...
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*Corresponding Author: [email protected]; Cell No: +92333-5532785 1
ANALYSIS OF SECOND-GRADE FLUID FLOW IN POROUS CHANNEL
WITH CATTANEO-CHRISTOV AND GENERALIZED FICK’S
THEORIES
Sami Ullah Khana, Nasir Ali
b, S. A. Shehzad
a,* and M.N. Bashir
a
aDepartment of Mathematics, COMSATS University Islamabad, Sahiwal 57000, Pakistan
bDepartment of Mathematics and Statistics, International Islamic University, Islamabad 44000,
Pakistan
Abstract: This attempt executes the combined heat mass transport features in steady MHD
viscoelastic fluid flow through stretching walls of channel. The channel walls are considered to
be porous. The analysis of heat transport is made by help Cattaneo-Christov heat diffusion
formula while generalized Fick’s theory is developed for study of mass transport. The system of
partial differential expressions is changed into set of ordinary differential by introducing suitable
variables. The homotopic scheme is introduced for solving the resultant equations and then
validity of results are verified by various graphs. An extensive analysis has been performed for
the influence of involved constraints on liquid velocity, concentration and temperature profiles. It
is noted that the normal component of velocity decreases by increasing Reynolds number while
retards for increasing viscoelastic constraint. Both temperature and concentration profiles
enhanced by increasing combined parameter and Reynolds number. The presence of thermal
relaxation number and concentration relaxation number declines both temperature and
concentration profiles, respectively.
Keywords: Cattaneo-Christov model; Fick’s law; viscoelastic fluid; porous medium; stretching
walls channel
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1. Introduction
The phenomenon of heat transportation is produced by thermal energy movement from one
object to an-other object due to difference in temperature. Such objects can be solid, a liquid and
solid or gas, or within a gas or liquid. The interest in heat transfer phenomena is increasing
substantially due to its countless industrial and technological applications. The wide-ranging
applications of heat transfer can be seen in many industrial and engineering processes. The most
valuable applications are fuel cells, energy production and cooling process in various atomic
devices. To predict heat transfer analysis, Fourier’s [1] developed one of most effective models
to predict heat transport analysis. The unique feature of this fluid model is that it is more capable
to envisage heat transfer analysis in macroscopic systems. Further, the mathematical modeling
based on Fourier’s model results the parabolic type form of energy expression. Cattaneo [2]
presented the generalization of this theory by addition of relaxation time phenomenon which
transformed the expression of energy in hyperbolic form. This formula enables the transport of
heat by mean of thermal waves with confined speed. The theory of Cattaneo [2] was extended by
Christov [3] in which he changed the time derivative with Oldroyd-B upper convected
derivative. Straughan [4] utilized this law to elaborate the thermal convection aspects in flow of
horizontal layer viscous liquid. Han et al. [5] observed that presence of thermal relaxation
constraints which suppressed the thermal thickness of boundary-layer. Khan et al. [6] computed
numerical solution by using shooting technique to examine the heat transportation characteristics
based on Cattaneo-Christov expressions. Later on, Meraj et al. [7] employed this model of heat
diffusion to elaborate the heat transport effects in the flow of Jeffrey fluid with variable
conductivity.
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In several medicinal and engineering processes, the involvement of stretched
magnetohydrodynamic (MHD) flows in electrical conducting materials have various applications
in industry of metal-working, nuclear reactors, plasma, thermal insulators, modern metallurgical,
oil exploration, extraction of geothermal energy and MHD generators. MHD flows through an
arteries in the several physiological processes has keen interest of researchers and scientists. To
control the fluid flows, mixing of samples, heat transfer rate and biological transportation applied
magnetic field is used. Many authors proved an extensive analysis regarding flow of various
fluids models in presence of applied magnetic field [8-18].
The phenomenon of porous medium has many applications in different engineering processes
include petroleum technology, solar collectors, porous insulation, drying processes, geothermal
energy, geophysics, oil recovery, packed beds etc. Fluid flows in porous medium mainly depend
on the differential expression that developed by macroscopic motion of liquid. Darcy [19]
observed in his experimental study that applied pressure-gradient and flow velocity are linearly
proportional for the case of unidirectional flow under uniform medium. This Darcy’s theory is
very effective role in different applications of biomedical engineering like biological tissues [20].
Attia [21] computed asymptotic solutions of viscous liquid flow through insulated disk by
utilizing Darcy model. In another attempt, Attia et al. [22] presented the flow characteristics to
time varying non-Newtonian liquid over rotating insulated disk in the application of porous
medium. Siddiq et al. [23] examined the Darcy-Forchheimer porous theory for convectively
heating nanofluid flow. Some novel numerical computations regarding flow of alumina
nanoparticles through a permeable porous enclosure was by Sheikholeslami et al. [24].
In past few decades, a good deal attention has be devoted to analysis and mathematical modeling
of flow between stretching boundaries because of its scientific applications such as extrusion
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process in plastic and metal industries, artificial fibers, metal spinning, glass blowing, drawing
plastic films and metal industries. This is why many authors studied this phenomenon in various
fluids models with different physical properties. Ashraf and Batool [25] developed the algorithm
of shooting method to find the numerical solution of buoyancy driven flow of micropolar fluid in
a disk. Turkyilmazoglu [26] computed the numerical expressions of flow of viscous fluid
between radially stretchable rotating disk by employing spectral numerical integration scheme.
Hayat et al. [27] implemented homotopy analysis method to discuss steady-state flow of
Newtonian fluid generated due to stretchable rotating disk.
The flow problem associated with pulsating motion of walls of channel gained the attentions of
investigators in recent years. The magnetohydrodynamic channel flow is one of great topic of
interest for engineers because of its theoretical and practical applications such as space vehicle
reentry, accelerators, astrophysical flows solar power technology. The flow causes by stretching
walls channel was extensively studied for viscoelastic fluid model via analytically [28]. Misra et
al. [29] captured the novel features of viscous fluid model by considering MHD flow in channel
with pulsating walls by using finite difference method. The investigations of electrically
conducing flow of non-Newtonian fluid through a stretching wall channel were shown
numerically et al. Misra et al. [30]. They considered the blood as non-Newtonian fluid in their
investigation. In another contribution, Misra et al. [31] explored the effects of induced magnet
field in flow of second grade occupied between walls of channel. They also utilized the heat
transfer phenomenon by using well Fourier law of heat conduction. Raftari and Vajravelu [32]
showed that series solution obtained by homotopy analysis method has an excellent agreement
with [31]. Abbasi et al. [33] presented slip flow of electrically conducting Maxwell fluid in
stretchable wall porous channel.
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Due to immense industrial applications, the aim of this study is to examine combined mass
transport analysis of electrically-conducting viscoelastic fluid in a porous stretching walls
channel by using Cattaneo-Christov heat diffusion. The results of this investigation may be of
interest to fluid dynamicity and for physiologists in their investigations on blood flow in arteries
under chemical reaction. The solution of modeled problem is computed via homotopy analysis
method. The physical properties of various flow features parameters are explored with various
graphs.
2. Flow Analysis
We assume the steady-state situation of laminar, incompressible second grade fluid flow
confined by planes .y a It is assumed that the fluids particles flows due to solely motion of
stretching walls. The magnetic force of strength 0B is imposed perpendicular to the walls of
channel (see Fig. 1). It is mention beforehand that dominant of induced magnetic force can be
neglected as we consider low magnetic Reynolds number assumptions. Let wT represents the
constant temperature of the walls. The develop equations of the flow dynamics in the channel
can be considered as [24]:
0,u v
x y
(1)
22 3 3 2 22 0
02 2 3 2 2.
Bu v u u u u u u uu v k u v u u
x y y x y y x y y x y k
(2)
here u and v reflects velocity component along coordinate axis x and y , respectively, v
signifies the kinematic viscosity, the electric intensity, 0B the strength of applied magnetic
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field, the fluid density, 0k represents the elasticity parameter, is porosity parameter and
k is permeability parameter. The imposed boundary conditions are [24]:
, 0, at ,
0, 0, at 0.
u bx v y a
uv y
y
(3)
Let us introduce dimensionless quantities [21]:
, , .y
u bxf v abfa
(4)
Using above dimensionless variables, Eqs. (2)-(3) transformed as
2 2
2 Re 0,f K f f f ff f ff Mf
(5)
0 0, 1 0, 1 1, 0 0, f f f f (6)
in which, 1 /K b is viscoelastic parameter, 0M B abk
is the combined magnetic
and porosity parameter (combined parameter) and 2Re /a b is the Reynolds number.
2.1 Heat and Mass Transfer Analysis
The generalized expressions of Fourier’s and Fick’s theories are [5,6]:
,E k Tt
qq V q V q q V (7)
,C BD Ct
JJ V J V J J V (8)
where q and J denotes the heat and mass fluxes, respectively, BD stands for molecular
diffusivity of the species, E and C are the thermal and concentration relaxation times,
respectively. It is note-worthy to point-out that for 0E C in Eqs. (7) and (8), the
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expressions for Classical Fourier’s and Fick’s laws retained. Thus the energy equation and
presence of thermal radiation and concentration equation are defined as
2
2,E E
T T Tu v
x y y
(9)
2
2,C C B
C C Cu v D
x y y
(10)
where represents the liquid thermal diffusivity and E and C can be expresses as
2 2 22 2
2 22 ,E
u T v T T v T u T T Tu v uv u v u v
x x y y x y x y y x x y
(11)
2 2 22 2
2 22 ,C
u C v C C v C u C C Cu v uv u v u v
x x y y x y x y y x x y
(12)
We impose following boundary conditions for governing energy and concentration equations
, at ,
0, 0, at 0.
w wT T C C y a
T Cy
y y
(13)
The governing equations are made dimensionless by introducing following dimensionless
variable
, ,w w
T C
T C (14)
21Re Re 0,
PrTf ff f (15)
21Re Re 0,Cf ff f
Sc (16)
where Pr / reflects the Prandtl number, T Eb stands for thermal relaxation constraint,
/ BSc D denotes the Schmidt number and C Cb reflects the concentration relaxation
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constraint.
The dimensionless boundary conditions are
'(0) 0, (1) 1, '(0) 0, (1) 1. (17)
3. Homotopy Analysis Method
The mathematical modeling of many engineering problems involves the differential equations of
highly nonlinear nature. Such equations set a challenge for engineers to compute either analytical
or numerical solution. A famous analytical method, homotopy analysis method (HAM) is a
power full technique to derive the series solution of differential expressions without restriction of
large or small constraint. This useful method offers great freedom to adopt and control the region
of convergence. The benefit of this method over various numerical techniques is that of rounding
off errors free which take place by discretization process. The computations of this method do
not require any large time and computer memory. This approach was originally proposed by
Liao [34]. After that, distinct researchers adopted this scheme to solve the governed differential
equations [35-41]. In present section, we introduce one of the most powerful techniques to solve
the system of Eqs. (5) and (15)-(16). We used homotopy analysis scheme to discuss the
analytical solution for all values of given parameters. To proceed, we suggest following initial
approximations for given flow problem
3 2 2 2
0 0 0
1 1 1( ) , ( ) , ( ) .
2 2 2f (18)
The differential operators are
3 2 2
3 2 2, , ,f£ £ £
(19)
which satisfying
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2 3
1 2 3 4 0,f£ A A A A (20)
2
5 6 0,£ A A (21)
2
7 8 0,£ A A (22)
whereiA ( 1,2,...8)i denotes constants.
4. Convergence of Solution
The series solution obtained in above section is strictly reliable on auxiliary constraints
,fh h and .h The appropriate values of these parameters are necessary for convergence of
HAM solution. Graphs of these auxiliary parameters
have been plotted at 16th order of
approximations for the selection of suitable range of these parameters. In Fig. 2 it has been
analyzed admissible values for 0.8 0.2fh , 1.5 0.3 and 1.5 0.3.h The role
of convergence in the given region is quit necessary for guaranteed the solution. It is commonly
noted that the values of involved parameters are not properly selected, the comparison of
homotopy analysis method with other exact or numerical methods becomes quite difficult and
time consuming. A suitable selection of these parameters guaranteed the solution for various
sundry parameters [42]. In order to validate our solution, present results are compared with the
already available numerical values reported by Hayat et al. [28]. It is seen that our results has an
excellent agreement with these reported results.
5. Results and Discussion
After computing the explicit analytic solution discussed in previous section, the aim of this
section is to present the inner sight of the study against various flow parameters. A graphical
analysis for distinct controlling governing parameters for velocity, temperature and concentration
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profiles are presented by sketching Figs. 3–17. The graphical representation of viscoelastic
parameter K on normal velocity component f is shown in Fig. 3. The values of K are
ranging from 0 to 5.5. It is observed that the magnitude of velocity enhanced for larger values of
K. Fig. 4 which is proportional to mass flow rate, shows that back mass flow rate decreases when
the M increases. Since the combined parameter is combination of both Hartmann number and
porosity parameter which strictly reduce the magnitude of the velocity of fluids particles. Fig. 5
depicts the influence of Reynolds number Re in the velocity component .f The magnitude of
component of velocity f decreases in the whole region by increasing Reynolds number Re .
Fig. 6 exhibits that when M and Re are constants and K is varying, the back flow velocity in
the center line decreases but the region of back flow increases. Here two different observations
are observed within the region of channel. The flow near the central line of channel increases
smoothly while decay in flow is observed near the walls of channel.
The variation of velocity f against for distinct values of M is depicted in Fig. 7. It is evident
from this figure that horizontal component of velocity f shows increasing behavior near the
walls of the channel but shows opposite effects near the central line of channel. By increasing the
magnetic field strength, back flow velocity in the center line decreases but the region of back
flow increases. The influence of Re ranging from 0 to 12 on f are sketched in Fig. 8. The
movement of stretching walls results a back flow near the central line of channel. It is observed
that velocity near the walls of channel decreases up to 0.5 . However, opposite effects are
observed far away from the center of channel. As expected a reversed trend for velocity is
observed near central line of channel is opposite.
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The outcomes of different values of Prandtl number Pr on are demonstrated in Fig. 9. In Fig.
9(a), variation of Prandtl number Pr 0.0,1.4,2.4,4.4 is observed by taking 2.5T . The
temperature profile showing decaying behavior because of low thermal diffusivity. Fig. 8(b)
explains the variation of same parameter for 5.5.T Again similar trend is observed, however,
the rate of heat transfer is smaller as compared to Fig. 9(a). Thus the proper choice of T can be
more useful for increasing or decreasing the fluid temperature. Fig. 10 manifested the superiority
of combined parameter M on . .The flow field develops a Lorentz force, acts like frictional
force and thus increase the temperature of fluid. In Fig. 11, the temperature of fluid decrease in
the whole domain by increasing viscoelastic parameter .K In Fig. 12 the influence of Reynolds
number Re is depicted on . A rise in temperature is observed for dominant values of Re.
Moreover the intensifying values of Re strengthen the boundary layer thickness. Fig. 13 reflects
the influence of relaxation time constant T on temperature profile . It is scrutinized that the
temperature profiles with related thermal boundary layer thickness decayed for increased T in
whole domain. Fig. 14 shows the behavior of concentration profile for viscoelastic parameter.
The concentration field decreases by increasing viscoelastic parameter. Contrary to Fig. 14, the
concentration profile is found to be increase with increasing M (Fig. 15). Fig. 16 elucidated the
outcomes of Re on concentration distribution. It is noted that concentration profile enhanced by
increasing Re. Finally Fig. 17 presents the effects of relaxation time constant C on
concentration profile. It is seen that concentration profile shows a decaying behavior by
increasing .C
6. Concluding Remarks
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MHD steady-state flow of second-grade fluid in a stretching walls channel in presence of porous
medium has been considered. The partial differential system which govern the flow is first
transformed to a forth order nonlinear differential equation and then solved by employing HAM.
This method can be useful in other analytical methods that use the series solution.
A decrease in the normal component of velocity is investigated by increasing combined
parameter and Reynolds number while it shows opposite trend by increasing viscoelastic
parameter.
By increasing combined parameter and Reynolds number, the fluid temperature in whole
domain increases and demotion in profile is observed by increasing viscoelastic
parameter, Prandtl number and thermal relaxation number.
It is executed that the larger values of thermal relaxation number deflate temperature
profile.
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Dr. Sami Ullah Khan is working as an Assistant Professor at Department of Mathematics,
COMSATS University Islamabad, Sahiwal Pakistan. He has completed his Ph.D in applied
mathematics from International Islamic University Islamabad, Pakistan in 2016. He has
published more than 30 international impact factor research papers. His research interests include
Newtonian and non-Newtonian fluids flow, flow through porous media, heat and mass transfer
and magnetohydrodynamics flows.
Dr. Nasir Ali is an Associate Professor in Department of Mathematics, International Islamic
University Islamabad, Pakistan. He earned his Ph. D. in applied mathematics from Quaid-I-
Azam University Islamabad, Pakistan in 2008. He has published more than 150 international
impact factor research papers with high impact factor. His research interests include Newtonian
and non-Newtonian fluids flow, gliding motion, heat and mass transfer, magnetohydrodynamics
and fluid dynamics of Peristaltic flows.
Dr. Sabir Ali Shehzad is working as an Assistant Professor at Department of Mathematics,
COMSATS University Islamabad, Sahiwal Pakistan. He has completed his Ph.D in Fluid
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Mechanics from Quaid-I-Azam University, Islamabad, Pakistan in 2014. His main research
interests are Newtonian and non-Newtonian fluids, nanofluids and heat and mass transfer
analysis. He has published 230 research articles in various high reputed international journals.
Dr Bahsir is working as an Assistant Professor at COMSATS University Islamabad, Sahiwal
campus. He completed his PhD from University of Engineering and Technology, Lahore in
2017. He has published several research articles. His main areas of research are computational
methods, numerical analysis and heat transfer.
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Figure Captions
Fig. 1: Geometry of problem.
Fig. 2(a-c): h-curve for (a) velocity (b) temperature and (c) concentration profile.
Fig. 3: Graph of K on .f
Fig. 4: Graph of M on .f
Fig. 5: Graph of Re on .f
Fig. 6: Graph of K on .f
Fig. 7: Graph of M on .f
Fig. 8: Graph of Re on .f
Fig. 9(a,b): Graph of Pr on for (a) 2.5T (b) 5.5T
Fig. 10: Graph of M on
Fig. 11: Graph of K on
Fig. 12: Graph of Re on
Fig. 13: Graph of T on
Fig. 14: Graph of K on .
Fig. 15: Graph of M on .
Fig. 16: Graph of Re on .
Fig. 17: Graph of C on .
Table Caption
Table 1: Comparison of present results with Hayat et al. [28] when 6.0.
20
Fig. 1: Geometry of problem.
Fig. 2(a-c): h-curve for (a) velocity (b) temperature and (c) concentration profile.
21
Fig. 3: Graph of K on .f
Fig. 4: Graph of M on .f
Fig. 5: Graph of Re on .f
Fig. 6: Graph of K on .f
22
Fig. 7: Graph of M on .f
Fig. 8: Graph of Re on .f
Fig. 9(a,b): Graph of Pr on for (a) 2.5T (b) 5.5T
23
Fig. 10: Graph of M on
Fig. 11: Graph of K on
Fig. 12: Graph of Re on
Fig. 13: Graph of T on
24
Fig. 14: Graph of K on .
Fig. 15: Graph of M on .
Fig. 16: Graph of Re on .
Fig. 17: Graph of C on .
25
Table 1: Comparison of present results with Hayat et al. [28] when 6.0.
K Re Hayat et al. [28] Present results
0.0
0.4
0.6
10 7.7958
15.4094
22.1710
7.79583
15.40952
22.17100
0.6 0.0
5.0
15.0
17.7101
18.2930
19.4301
17.71010
18.29329
19.43020