Research Article Effects of Heat Transfer and an Endoscope on Peristaltic Flow of a Fractional Maxwell Fluid in a Vertical Tube
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1 Abstract and Applied Analysis Volume 215, Article ID 36918, 9 pages Research Article Effects of Heat Transfer and an Endoscope on Peristaltic Flow of a Fractional Maxwell Fluid in a Vertical Tube H. Rachid Department of Physics, Faculty of Sciences Ain Chock, University of Hassan II, 5366 Casablanca, Morocco Correspondence should be addressed to H. Rachid rhassan2@yahoo.fr Received 29 May 215 Revised 23 September 215 Accepted 3 September 215 Academic Editor: Changbum Chun Copyright 215 H. Rachid. 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. We investigate the unsteady peristaltic transport of a viscoelastic fluid with fractional Maxwell model through two coaxial vertical tubes. This analysis has been carried under low Reynolds number and long wavelength approximations. Analytical solution of the problem is obtained by using a fractional calculus approach. The effects of Grashof number, heat parameter, relaxation time, fractional time derivative parameter, amplitude ratio, and the radius ratio on the pressure gradient, pressure rise, and the friction forces on the inner and outer tubes are graphically presented and discussed. 1. Introduction Peristaltic transport is a mechanism of pumping fluids in tubes when progressive wave of area contraction or expansion propagates along the length on the boundary of a distensible tube containing fluid. In the physiological process, peristalsis or the blood flow is the major applications of this transport phenomenon. The contractions and relaxations of the walls propel the fluid. The first investigation to study the peristaltic pumping was by Latham [1]. The peristaltic transport of a NewtonianfluidatlongwavelengthsatlowReynoldsnumber has been studied with particles suspended by Kaimal [2] or withoutparticlesbyshapiroetal.[3]andbymishraandrao [4]. The non-newtonian effects of fluids on the peristaltic transporthavebeenstudiedforathird-gradefluidbyalietal. [5], for a Jeffrey fluid by Abd-Alla et al. [6], for a Maxwell model by Rachid and Ouazzani [7], for a Herschel-Bulkley fluid by Medhavi [8], or for a power-law fluid by Shukla and Gupta [9]. The effect of an endoscope on peristaltic flow for a Newtonian fluid through a nonuniform annulus has been analyzed by Mekheimer [1]. This effect has been also studied forajohnsonsegalmanfluidbyakbarandnadeem[11]orfor a Maxwell fluid by Husseny et al. [12]. Recently, the peristaltic transport of non-newtonian fluids has gained considerable interest because of its applications in industry and biology. Mathematically, the non-newtonian fluids have a nonlinear relationship between the stress and the rate of strain. It is difficult to propose a single model which can exhibit all the properties of non-newtonian fluids. To describe the viscoelastic properties of such fluids recently, constitutive equations with ordinary and fractional time derivatives have been introduced. Fractional calculus has proved to be very successful in the description of constitutive relations of viscoelastic fluids. The starting point of the fractional derivative model of viscoelastic fluids is usually a classical differential equation which is modified by replacing the time derivative of an integral order with fractional order and may be formulated both in the Riemann-Liouville and in the Caputo sense [13]. This generalization allows one to define precisely noninteger order integrals or derivatives and this plays an important role in studying the valuable tool of viscoelastic properties. In recent years and considering the relevance of fractional models of viscoelastic fluids, a number of articles have addressed unsteady flows of viscoelastic fluids with the fractional Maxwellmodel[14,15],fractionalsecond-gradefluid[16,17], fractional Oldroyd-B model [18, 19], and fractional Burgers model [2]. For example, Tripathi [21] studied a mathematical model based on viscoelastic fractional Oldroyd-B model for the peristaltic flow of chyme in small intestine, which is assumedtobeintheformofaninclinedcylindricaltube.
2 2 Abstract and Applied Analysis The peristaltic transport for a fractional second-grade model through a cylindrical tube has been investigated by Tripathi [22]. Rathod and Channakote [23] analyzed the interaction of heat transfer on peristaltic pumping of a fractional secondgrade fluid through a vertical cylindrical tube by using Caputo s definition. For the fractional Maxwell model, Tripathi et al. [24] studied the peristaltic flow through a channel where the homotopy perturbation method (HPM) and Adomian decomposition method (ADM) are used. For the fractional Burger s model Tripathi et al. [25] studied the influence of slip condition on peristaltic transport by using a homotopy analysis method (HAM). This generalized model of fluid has been investigated for an infinite oscillating plate by Khan et al. [26], for an orthogonal rheometer by Siddiqui et al. [27] or between concentric cylinders by Shah [28]. Heat transfer analysis is one of the principle axes of research in chemical engineering, but nowadays due to its wide applications in biofluid mechanics it has great interaction with peristaltic motion. The effect of heat transfer on peristaltic transport of a Newtonian fluid through a porous medium in a vertical tube under the effect of a magnetic field has been studied by Vasudev et al. [29]. This effect on peristaltic flow with slip condition and variable viscosity in an asymmetric channel has been analyzed by Hayat and Abbasi [3]. Hayat et al. [31] investigated the effects of heat and mass transfer and wall properties on the peristalsis in a power-law fluid. The aim of this paper is to analytically study the effect of heat transfer on peristaltic flow of a viscoelastic fluid with fractional Maxwell model in the gap between two coaxial vertical tubes. The influence of different physical parameters on the pressure gradient, pressure rise, and the fictional forces has been graphically shown and discussed. 2. Formulation and Analysis Consider the peristaltic flow of a viscoelastic fluid with fractional Maxwell model through the gap between two coaxial vertical tubes. The inner tube is rigid (endoscope) maintained at a temperature T 1, and the outer tube has a sinusoidal wave traveling down its wall and it is exposed to temperature T as seen in Figure 1. In a cylindrical coordinate system (R, Z), the equations for the tube walls in their dimensional form are given by r 1 =a 1, r 2 =a 2 +bsin ( 2π λ (Z ct)), (1) where a 1 is the radius of the endoscope, a 2 is the average radius, b is the amplitude of the wave, λ is the wavelength, and c is the wave speed of the outer tube. The equation of the fractional Maxwell fluid is given by α1 (1 + λ 1 D α 1) S=μγ (2) t with t, S, γ, andμ being the time, shear stress, rate of shear strain, and the viscosity, respectively. λ 1 is the relaxation time and α 1 is the fractional time derivative parameter such that λ T T 1 b a 2 z a 1 Figure 1: Geometry of the problem. α 1 1. D α 1 t is the upper convected fractional derivative defined by D α 1 t in which (S) = D α 1 t (S) + (V )(S) L(S) (S) L T (3) γ=( V) + ( V) T (4) and D α 1 = α 1 is the fractional differentiation operator of t t order α 1 with respect to t and may be defined as [32] D α 1 t f (t) = t 1 d Γ(1 α 1 ) dt r f (ξ) (t ξ) α 1 dξ, α 1 1. (5) Here Γ( ) denotes the Gamma function. We choose a cylindrical coordinate system (r, z) where zaxis is the longitudinal direction and the r-axisistransverse to it. The equations of motion of the flow for an incompressible fluid are given by ρ[ u t + u u r + w u z ]= p r + 1 r r (rs rr)+ S rz z, ρ[ w t + u w r + w w z ] = p z + 1 r r (rs rz)+ S zz z +ρgα(t T ), ρc p [u T r + w T T z ]=k[ 2 r T r r + 2 T z 2 ]+, u r + u r + w z =, where ρ is the fluid density, T is the temperature, α is the coefficient of linear thermal expansion of the fluid, k denotes (6)
3 Abstract and Applied Analysis 3 thermal conductivity, c p denotes specific heat at constant pressure, is the constant heat addition/absorption, u and w arethevelocitycomponentsinthewaveframe,andp is the pressure. We assume that the extra stress S depends on r and t only. After using the initial condition S(t =),(2) (4)yieldS rr = S zz = S rθ = S θz =and α 1 α 1 (1 + λ 1 t α ) S 1 rz =μ w r, (7) where S rz is the tangential stress. Forcarryingoutfurtheranalysis,weintroducethefollowing dimensionless parameters: z= z λ Z= Z λ r 1 = r 1 a 2 r 2 = r 2 a 2 R= R a 2 t= ct λ u= λu a 2 c U= λu a 2 c w= w c W= W c λ 1 = cλ 1 λ ε= a 1 a 2, p= a2 2 p μλc θ= T T T 1 T = πca2 2 δ= a 2 λ Pr = μc p k Re = ρca 2 μ β= a 2 2 k(t 1 T ) Gr = ρgαa3 2 (T 1 T ), μ (8) where ε is the radius ratio, δ is the wave number, Re is the Reynolds number, Pr is the Prandtl number, Gr is the Grashof number, β is the nondimensional heat source/sink parameter, and φ istheamplituderatiowith<φ<1 ε. Using the above nondimensional quantities and under the assumptions of long wavelength approximation (i.e., δ 1 or λ a 2 ) and the low Reynolds number (i.e., Re ), (6) yield p =, (9) r (1 + λ α 1 1 Dα 1 t )( p z Grθ) = ( 2 w r r w ), (1) r u r + u r + w =, (11) z 2 θ r θ r r +β=. (12) The boundary conditions are w= 1 θ=1 w= 1 θ= at r=r 1 =ε, at r=r 2, (13) where r 2 =1+φsin(2πz) is the dimensionless equation of the outer tube radius in the wave frame. Integrating (12) with the boundary conditions (13), we find the dimensionless temperature as follows: θ= ln (r/r 2) ln (ε/r 2 ) + β (ε 2 ln (r/r 2 ) r 2 2 ln (r/ε)) β 4 ln (ε/r 2 ) 4 r2. (14) Use the transformations between the laboratory and the wave frames, in the dimensionless form, given by z=z t r=r u=u w=w 1, (15)
4 4 Abstract and Applied Analysis where U and W are the velocity components in the fixed frame. Substituting(14)in(1)andusingthesameboundary conditions,weobtainthevelocityprofileofthefluidas W= 1 4 f(r2 a 21 ln (r) +a 25 ) p z + 1 fgr [βr (βa 24 ln ( r ε ) a 41 ln ( r r 2 )+a 42 )r 2 ] (16) p/ z ε =.35 fgra 43, where f(t) = 1 + λ α 1 1 Dα 1 t =f. Using the definition of the fractional differential operator (5)wefindtheexpressionoff as follows: f=1+λ α 1 1 t α 1 Γ(1 α 1 ). (17) The volume rate of flow in the fixed coordinate system (R, Z)isgivenas r 2 p (Z, t) =2 WR dr = f (a 61 ε z +a 62). (18) Using the transformation (15) we find (Z, t) =q+r 2 2 ε2, (19) where q is the volume flow rate in the moving coordinate system given by r 2 q=2 wr dr. (2) ε The time-averaged flow rate is defined by 1 = (Z, t) dt = q φ2 2 ε2. (21) Eliminating the flow rate q between (19) and (21) we find (Z, t) =+r φ2 2. (22) From (18) and (22) we obtain the pressure gradient as follows: p z = 1 [( +r2 2 1 φ2 /2 ) a a 61 f 62 ]. (23) 3. The Pumping Characteristics The pressure rise Δp and the frictional force F λ at the walls of theinnerandoutertubes,inthenondimensionalform,are given by 1 p Δp = z dz, F (i) 1 = ε 2 ( p dz )dz, F (o) 1 = r 2 p 2 ( dz )dz. (24) 4 2 λ 1 =1 λ 1 =2 λ 1 =3 ε = z Figure 2: Pressure gradient p/ z versus axial distance z for different values of the relaxation time λ 1 and radius ratio ε with = 2, Gr =3, α 1 =.4, β=1, φ =.4,andt=1. 4. Results and Discussions We note that the fractional Maxwell model reduces to a Newtonian fluid when λ 1 =. The analytical expressions for the pressure gradient p/ z, the pressure rise Δp,andthefrictionalforcesontheinner and outer tubes, respectively, F (i) and F (o), are derived in the previous sections. In order to compute these physical quantities with respect to interest parameters of problem we observe that the integrals in (24) are not integrable in the closed form. They are evaluated numerically using a mathematics software. Pressure gradient p/ z against the axial distance z on one wavelength for different given values of the Grashof number Gr, the heat parameter β, the relaxation time λ 1,the fractional time derivative parameter α 1,theamplituderatioφ, and the radius ratio ε is plotted in Figures 2 4. These figures show that, in the wider part of the tube (z [,.5]), p/ z is relatively small, where the flow can easily pass without giving any large pressure gradient. However, in the narrow part (z [.5, 1]) a much larger pressure gradient is required to maintain the same flux to pass it, especially for the narrowest position near z =.75. Moreover the maximum of the pressure gradient increases with increasing Gr, φ, ε, andα 1 while it decreases with the increase in λ 1 and β. The effects of various parameters on the pressure rise Δp versus the time-averaged flow rate are shown in Figures 5 7. It is known that we have the following peristaltic regions, pumping region (Δp > ), free-pumping region (Δp = ), and copumping region (Δp < ). These figures show a linear relationship between Δp and in all the regions that is, the pressure rise decreases with increasing the time-averaged flow rate. From Figure 5 we observe that the time-averaged flow rate increases with increasing Gr while it decreases with the increase in β in all the regions. In addition, Δp and
5 Abstract and Applied Analysis Gr = φ =.4 1 p/ z α =.2 α =.4 α =.6 φ = z Figure 3: Pressure gradient p/ z versus axial distance z for different values of the parameter α 1 and amplitude ratio φ with = 2, Gr =3, ε =.35, β=1, λ 1 =1,andt=1. Δp β= β=1 β=2 Gr = Figure 5: Pressure rise Δp versus the time-averaged flow rate for different values of the heat parameter β and the Grashof number Gr with λ 1 =1, α 1 =.4, ε =.35, φ =.4,andt= Gr = Gr =1 12 ε = p/ z Δp ε = β= β=1 β= z λ 1 =1 λ 1 =2 λ 1 =3 Figure 4: Pressure gradient p/ z versus axial distance z for different values of the heat parameter β and the Grashof number Gr with = 2, λ 1 =1, α 1 =.4, ε =.35, φ =.4,andt=1. Figure 6: Pressure rise Δpversus the time-averaged flow rate for different values of the relaxation time λ 1 and radius ratio ε with Gr = 3, α 1 =.4, β=1, φ =.4,andt=1. the flow rate andthepumpingincreasewithincreasinggr whiletheydecreasewiththeincreaseinβ. Figures 6-7 show that for different values of ε, λ 1, φ, andα 1 the curves are intersecting in the pumping region. In addition, for a given value of the pressure rise Δp we observe that in both the freepumping and copumping regions the time-averaged flow rate increases with increasing λ 1 while it decreases with the increase in α 1. The same figures show that decreases in the free-pumping and copumping regions with increasing ε and φ. InFigures8 13weplottedthefrictionalforcesF (i) and F (o) on the inner and outer tubes, respectively. These figures show that F (i) and F (o) have an opposite behavior compared to the pressure rise Δp versus the physical parameters. In addition the frictional force on the outer tube F (o) is greater than the frictional force on the outer tube F (i).
6 6 Abstract and Applied Analysis 5 15 φ =.4 Δp 1 5 φ =.35 F (i) ε =.3 ε = α =.2 α =.4 α =.6 Figure 7: Pressure rise Δpversus the time-averaged flow rate for different values of the parameter α 1 and amplitude ratio φ with Gr = 3, ε =.35, β=1, λ 1 =1,andt=1. λ 1 =1 λ 1 =2 λ 1 =3 Figure 9: Frictional force on the inner tube F (i) versus the timeaveraged flow rate for different values of the relaxation time λ 1 and radius ratio ε with Gr =3, α 1 =.4, β=1, φ =.4,andt= Gr =1 5 F (i) F (i) 5 1 φ = β= β=1 β=2 Gr = Figure 8: Frictional force on the inner tube F (i) versus the timeaveraged flow rate for different values of heat parameter β and the GrashofnumberGrwithλ 1 =1, α 1 =.4, ε =.35, φ =.4, and t= α =.2 α =.4 α =.6 φ = Figure 1: Frictional force on the inner tube F (i) versus the timeaveraged flow rate for different values of the parameter α 1 and amplitude ratio φ with Gr =3, ε =.35, β=1, λ 1 =1,andt=1. 5. Conclusions We have analytically studied the effect of heat transfer on peristaltic flow of fractional Maxwell model in the gap between two vertical coaxial tubes. The problem is simplified under the assumptions of long wavelength approximation and low Reynolds number. Analytical solution of problem is obtained by using a fractional calculus approach. The pressure gradient, pressure rise, and frictional forces on the endoscope and on the outer tube are discussed with the physical parameters, Grashof number Gr, the heat parameter β, the relaxation time λ 1, the fractional time derivative parameter α 1,theamplituderatioφ,andtheradiusratioε.Thegraphical solutions have shown the following: (1) The maximum of the pressure gradient p/ z increases with increasing Gr, φ, ε,andα 1 while it decreases with the increase in λ 1 and β. (2) Thetime-averaged flow rate increases with increasing Gr while it decreases with the increase in β in
7 Abstract and Applied Analysis Gr =1 4 2 F (o) F (o) 2 4 φ = β= β=1 β=2 Gr = Figure 11: Frictional force on the outer tube F (o) versus the timeaveraged flow rate for different values of heat parameter β and the GrashofnumberGrwithλ 1 =1, α 1 =.4, ε =.35, φ =.4, and t= α =.2 α =.4 α =.6 φ = Figure 13: Frictional force on the outer tube F (o) versus the timeaveraged flow rate for different values of the parameter α 1 and amplitude ratio φ with Gr =3, ε =.35, β=1, λ 1 =1,andt=1. 5 (4) decreases with increasing φ and ε in the freepumping and copumping regions. (5) The frictional forces F (i) and F (o) have opposite behavior compared to the pressure rise Δp versus the physical parameters. F (o) ε =.3 Appendix 5 Consider ε =.35 = ln ( ε r 2 ) λ 1 =1 λ 1 =2 λ 1 =3 a 12 =r 2 2 ε2 a 13 =r 2 2 ln (ε) a 14 =ε 2 ln (r 2 ) Figure 12: Frictional force on the outer tube F (o) versus the timeaveraged flow rate for different values of the relaxation time λ 1 and radius ratio ε with Gr =3, α 1 =.4, β=1, φ =.4,andt=1. all the regions of pumping for a given value of the pressure rise Δp. (3) increases with the increase in λ 1 in both the freepumping and co-pumping regions while we observe an opposite behavior versus α 1 in these two regions. a 15 = r2 2 a 16 = ε2 2 a 17 = r4 2 a 18 = ε4 2
8 8 Abstract and Applied Analysis a 21 = a 12 a 22 = a 13 a 23 = a 14 a 24 = a 15 a 25 = a 16 a 26 =a 22 a 23 a 27 =a 18 a 17 a 28 =a 2 15 a2 16 a 29 =a 13 a 15 a 14 a 16 a 31 =a 16 +a 24 +a 26 a 32 = a 26 a 33 =a 15 a 26 a 34 =a 16 a 26 a 35 =a 27 +a 29 a 36 =a 33 a 34 a 37 =2a 35 a 28 a 38 =a 23 +a 32 a 41 = 4+βa 25 a 42 = 4+βa 12 a 43 =4βa 36 16a 39 +3βa 29 a 44 =a 21 (r 2 2 ln (r 2) ε 2 ln (ε)) a 45 =a 12 (2a 21 +a 25 ) a 46 =r 4 2 ε4 a 47 = (ε 2 a 41 βr 4 2 a 24) a 48 =a 42 a 45 a 49 =a 41 a 45 a 51 =a 24 a 45 a 52 =a 43 a 12 a 53 =r 8 2 ε8 a 61 = 1 8 [2a 44 +2a 45 +a 46 ] a 62 = Gr 256 [8 (a 48 +a 47 )+4a 52 +2a 49 +β(a 53 2a 51 )]. Conflict of Interests (A.1) The author declares that there is no conflict of interests regarding the publication of this paper. Acknowledgments The author is grateful to the referees and editors for their constructive suggestions. References [1] T. W. Latham, Fluidmotionsinaperistalticpump[M.S.thesis], Massachusetts Institute of Technology, Cambridge, Mass, USA, [2] M. R. Kaimal, Peristaltic pumping of a newtonian fluid with particles suspended in it at low reynolds number under long wavelength approximations, Applied Mechanics, Transactions ASME,vol.45,no.1,pp.32 36,1978. [3]A.H.Shapiro,M.Y.Jaffrin,andS.L.Weinberg, Peristaltic pumping with long wavelengths at low reynolds number, Fluid Mechanics,vol.37,no.4,pp ,1969. [4] M. Mishra and A. R. Rao, Peristaltic transport of a Newtonian fluid in an asymmetric channel, Zeitschrift für Angewandte Mathematik und Physik,vol.54,no.3,pp ,23. [5] N. Ali, M. Sajid, Z. Abbas, and T. Javed, Non-Newtonian fluid flow induced by peristaltic waves in a curved channel, European Mechanics, B/Fluids,vol.29,no.5,pp ,21. [6] A.M.Abd-Alla,S.M.Abo-Dahab,andM.M.Albalawi, Magnetic field and gravity effects on peristaltic transport of a jeffrey fluid in an asymmetric channel, Abstract and Applied Analysis, vol.214,articleid896121,11pages,214. [7] H. Rachid and M. T. Ouazzani, Interaction of pulsatile flow with peristaltic transport of a viscoelastic fluid: case of a Maxwell fluid, International Applied Mechanics,vol. 6, no. 5, Article ID 14561, 214. [8] A. Medhavi, Peristaltic pumping of a non-newtonian fluid, Applications and Applied Mathematics,vol.3,no.1,pp , 28. [9] J. B. Shukla and S. P. Gupta, Peristaltic transport of a powerlaw fluid with variable consistency, Biomechanical Engineering,vol.14,no.3,pp ,1982. [1] K. S. Mekheimer, Peristaltic transport of a newtonian fluid through a uniform and non-uniform annulus, Arabian Journal for Science and Engineering,vol.3,no.1,pp.69 83,25. [11] N. S. Akbar and S. Nadeem, An analytical and numerical study of peristaltic transport of a Johnson Segalman fluid in an endoscope, Chinese Physics B,vol.22,no.1,ArticleID1473, 213. [12] S. Z. A. Husseny, Y. Abd Elmaboud, and Kh. S. Mekheimer, The flow separation of peristaltic transport for Maxwell fluid
9 Abstract and Applied Analysis 9 between two coaxial tubes, Abstract and Applied Analysis, vol. 214,ArticleID269151,17pages,214. [13] F. Mainardi and G. Spada, Creep, relaxation and viscosity properties for basic fractional models in rheology, European Physical Journal: Special Topics,vol.193,no.1,pp ,211. [14] H. i and H. Jin, Unsteady rotating flows of a viscoelastic fluid with the fractional Maxwell model between coaxial cylinders, Acta Mechanica Sinica,vol.22,no.4,pp.31 35,26. [15]C.Fetecau,M.Athar,andC.Fetecau, Unsteadyflowofa generalized Maxwell fluid with fractional derivative due to a constantly accelerating plate, Computers and Mathematics with Applications,vol.57,no.4,pp ,29. [16] M. Khan, S. H. Ali, and H. i, Exact solutions for some oscillating flows of a second grade fluid with a fractional derivative model, Mathematical and Computer Modelling,vol.49,no.7-8, pp ,29. [17] W. Tan and M. Xu, Unsteady flows of a generalized second grade fluid with the fractional derivative model between two parallel plates, Acta Mechanica Sinica, vol.2,no.5,pp , 24. [18] Y. Liu, L. Zheng, and X. Zhang, Unsteady MHD couette flow of a generalized oldroyd-b fluid with fractional derivative, Computers & Mathematics with Applications, vol.61,no.2,pp , 211. [19]. Haitao and X. Mingyu, Some unsteady unidirectional flows of a generalized Oldroyd-B fluid with fractional derivative, Applied Mathematical Modelling, vol.33,no.11,pp , 29. [2] M. Khan, A. Anjum, C. Fetecau, and H. i, Exact solutions for some oscillating motions of a fractional Burgers fluid, Mathematical and Computer Modelling, vol.51,no.5-6,pp , 21. [21] D. Tripathi, A mathematical model for the peristaltic flow of chyme movement in small intestine, Mathematical Biosciences, vol. 233, no. 2, pp. 9 97, 211. [22] D. Tripathi, Peristaltic flow of a fractional second grade fluid throughacylindricaltube, Thermal Science, vol.15,no.2,pp. S167 S173, 211. [23]V.P.RathodandM.M.Channakote, Interactionofheat transfer and peristaltic pumping of fractional second grade fluid through a vertical cylindrical tube, Thermal Science,vol.18,no. 4, pp , 214. [24]D.Tripathi,S.K.Pandey,andS.Das, Peristalticflowofviscoelastic fluid with fractional Maxwell model through a channel, Applied Mathematics and Computation,vol.215,no.1,pp , 21. [25] D.Tripathi,P.K.Gupta,andS.Das, Influenceofslipcondition on peristaltic transport of a viscoelastic fluid with fractional Burger s model, Thermal Science, vol. 15, no. 2, pp , 211. [26] M. Khan, S. Hyder Ali, and H. i, On accelerated flows of a viscoelastic fluid with the fractional Burgers model, Nonlinear Analysis: Real World Applications,vol.1,no.4,pp , 29. [27] A. M. Siddiqui, M. A. Rana, and N. Ahmed, Magnetohydrodynamics flow of a Burgers fluid in an orthogonal rheometer, Applied Mathematical Modelling, vol. 34, no. 1, pp , 21. [28] S. H. A. M. Shah, Some helical flows of a Burgers fluid with fractional derivative, Meccanica,vol.45,no.2,pp ,21. [29] C. Vasudev, U. Rajeswara Rao, and G. Prabhakara Rao, Peristaltic flow of a Newtonian fluid through a porous medium in a vertical tube under the effect of a magnetic field, International Current Science,vol.1,no.3,pp.15 11,211. [3] T. Hayat and F. M. Abbasi, Peristaltic mechanism in an asymmetric channel with heat transfer, Mathematical and Computational Applications,vol.15,no.4,pp ,21. [31] T. Hayat, S. Hina, and A. A. Hendi, Peristaltic motion of powerlaw fluid with heat and mass transfer, Chinese Physics Letters, vol. 28, no. 8, Article ID 8477, 211. [32] I. Podlubny,Fractional Differential Equations, Accademic Press, San Diego, Calif, USA, 1999.
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