Abstract
In the current problem, we aim to discuss the heat transfer of pulsatile unsteady fractional Maxwell fluid (blood) flow through a vertical stenosed artery with body acceleration. The concept of fractional Cattaneo model will modify the energy equation. We will get the solutions using Laplace and finite Hankel transformations. The inverse of the transformed functions will be calculated numerically. It is observed that, the heat relaxation time causes a delay in the heat transfer until a critical time. In addition, the heat transfer increases sharply to take its maximum value at a critical value of time then it decreases to reach the steady state. Moreover, the blood velocity, the flow rate, and the shear stress continue to fluctuate during the time period due to the pulsatile phenomenon and body acceleration.
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Abbreviations
- \((A_{0}\) and \(A_{1})\) :
-
Steady and fluctuating components of the pressure gradient
- a :
-
The radius of the catheter tube (m)
- \(a_{0}\) :
-
The amplitude (m)
- B :
-
The body acceleration parameter
- \(c_{\mathrm{p}}\) :
-
Specific heat \(({\hbox{J kg}}^{-1}\,\hbox{K}^{-1})\)
- d :
-
The length of non-stenotic region (m)
- e :
-
The amplitude fluctuation parameter
- \(F'(t')\) :
-
The periodic body acceleration
- \(f_{\mathrm{b}}\) :
-
The frequency of body acceleration (Hz)
- \(f_{\mathrm{p}}\) :
-
The pulse frequency (Hz)
- g :
-
The acceleration of gravity \((\hbox{m s}^{-2})\)
- Gr:
-
Grashof number
- K :
-
Thermal conductivity of the fluid \(({\hbox{W m}}^{-1}\,\hbox{K}^{-1})\)
- \(p'\) :
-
Pressure \(({\hbox{N m}}^{-2})\)
- Pr:
-
Prandtl number
- \(Q_{0}\) :
-
Heat source
- \(r'\) :
-
Radial direction (m)
- \(R_{\mathrm{o}}\) :
-
The radius of normal artery (m)
- \(R'_{2}\) :
-
Radius of the outer tube (m)
- Re:
-
Reynolds number
- \(T'\) :
-
Fluid temperature (K)
- \(T_{0}\) and \(T_{1}\) :
-
Walls temperature
- \(U'\) :
-
The velocity vector
- \(u'\) and \(w'\) :
-
Velocity components in radial and axial directions respectively \(({\hbox{m s}}^{-1})\)
- \(z'\) :
-
Axial direction (m)
- \(\alpha ,\;\beta\) and \(\nu\) :
-
The fractional-orders
- \(\gamma ^{2}\) :
-
Womersley frequency parameter
- \(\delta\) :
-
The critical height of the stenosis (m)
- \(\epsilon\) :
-
The radius ratio
- \(\zeta\) :
-
The non-dimensional heat
- \(\theta\) :
-
Dimensionless temperature
- \((\lambda '\) and \(\lambda '_{1})\) :
-
The relaxation times of fluid and heat respectively
- \(\mu\) :
-
Viscosity \(({\hbox{N s m}}^{-2})\)
- \(\phi\) :
-
The lead angle
- \(\rho\) :
-
Density \((\hbox{kg m}^{-3})\)
- \(\varrho\) :
-
The thermal expansion coefficient \((\hbox{K}^{-1})\)
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Acknowledgements
The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through General Research Project under Grant No. (G.R.P-213-41).
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Appendix A
Appendix A
The constitutive relation of fractional Maxwell fluid is [9, 10]
where \({\dot{\Upsilon }}'\) is the shear rate, \(\sigma '\) is the shear stress and \({\tau }'\) denotes the stress tensor.
The momentum equation is
where \(\mathbf{e}_{\mathrm{z}}\) is the unit vector in z-direction. The combination between Eqs. (A.1), (A.2) and (A.3) when \(\mathbf{U }'=(u',0,w')\) gives Eqs. (6) and (7).
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El Kot, M.A., Abd Elmaboud, Y. Unsteady pulsatile fractional Maxwell viscoelastic blood flow with Cattaneo heat flux through a vertical stenosed artery with body acceleration. J Therm Anal Calorim 147, 4355–4368 (2022). https://doi.org/10.1007/s10973-021-10822-2
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DOI: https://doi.org/10.1007/s10973-021-10822-2