Abstract
Investigation of peristaltic motion of a hybrid/mono-carbon nanotube–water flow through a curved channel is carried out in this work. This work meets a lot of engineering and bioapplications such as the motion of the food through the digestive tract and the pumping of the urine from the kidney to the bladder and the pumping systems in the engineering field. The model is described by a set of partial differential equations, this system is transformed to a dimensionless system in terms of which is solved in two steps, the stream function is solved analytically with the assistance of the Mathematica program, and the heat equation is solved numerically using fifth-order Runge–Kutta method. The impact of the channel curvature, amplitude ratio, and the nanoparticle concentration on the pumping and trapping phenomenon is presented and discussed in detail. As concluded from the study, the hybrid type of nanoparticles raises the pressure gradient at the upper and the lower walls as well as the heat transfer decreases due to the presence of two types of nanotubes.
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Abbreviations
- \(\bar{ X}\) :
-
Cartesian coordinate along the transversal direction \(\left( m \right)\)
- \(\bar{R},\) :
-
Cartesian coordinate along the radial direction \(\left( m \right)\)
- \(\bar{U}\) :
-
Transversal velocity \(\left( {m/s} \right)\)
- \(\bar{V}\) :
-
Radial velocity \(\left( {m/s} \right)\)
- \(\bar{ T}_{0}\) :
-
The lower-wall temperature \(\left( K \right)\)
- \(\bar{ T}_{1}\) :
-
The upper-wall temperature \(\left( K \right)\)
- \(\bar{a}\) :
-
Channel width \(\left( m \right)\)
- \(\bar{b }\) :
-
Amplitude \(\left( m \right)\)
- λ:
-
Wavelength \(\left( m \right)\)
- c :
-
Speed \(\left( {m/s} \right)\)
- \(\bar{R}^{*}\) :
-
Channel radius \(\left( m \right)\)
- \(\bar{t}\) :
-
Time (sec)
- \(z\) :
-
Heat transfer coefficient
- \(\bar{Q}\) :
-
Flow rate volume
- \(\bar{H}\) :
-
Sinusoidal function at the wall
- \(\psi\) :
-
Stream function
- \(x\) :
-
Dimensionless coordinate along the transversal direction \(\left( { = \frac{{2\pi \bar{x}}}{\lambda }} \right)\)
- \(r\) :
-
Dimensionless coordinate along the radial direction \(\left( { = \frac{{\bar{r}}}{{\bar{a}}}} \right)\)
- \(u\) :
-
Dimensionless transversal velocity \(\left( { = \frac{{\bar{u}}}{c}} \right)\)
- \(v\) :
-
Dimensionless radial velocity \(\left( { = \frac{{\bar{v}}}{c}} \right)\)
- \(\theta\) :
-
Dimensionless temperature \(\left( { = \frac{{\bar{T} - \bar{T}_{1} }}{{\bar{T}_{0} - \bar{T}_{1} }}} \right)\) \(\left( - \right)\)
- \(\phi\) :
-
Nanoparticles volume fraction \(\left( - \right)\)
- \(\rho\) :
-
Fluid density \(\left( {{\text{kg}}/{\text{m}}^{3} } \right)\)
- \(\mu\) :
-
Dynamic viscosity \(\left( {{\text{Ns}}/{\text{m}}^{2} } \right)\)
- \(\nu\) :
-
Kinematic viscosity \(\left( {m^{2} /s} \right)\)
- \(k\) :
-
Thermal conductivity \(\left( {{\text{W}}/{\text{m}}.K} \right)\)
- \(\rho c_{p}\) :
-
Volumetric heat capacity \(\left( {{\text{J}}/{\text{m}}^{3} .{\text{K}}} \right)\)
- K :
-
Curvature parameter, \(k = \frac{{\bar{R}^{*} }}{{\bar{a}}}\)
- \(\delta\) :
-
Wavenumber, \(\delta = \frac{{2\pi \bar{a} }}{\lambda }\)
- \(Br\) :
-
Brinkman number, \(Br = \frac{{c^{2} \mu_{f} }}{{k_{f} \left( {\bar{T}_{0} - \bar{T}_{1} } \right)}}\)
- \(\epsilon\) :
-
Amplitude ratio \(= \frac{{\bar{b}}}{{\bar{a}}}\)
- \(P\) :
-
Dimensionless pressure \(\left( { = \frac{{2\pi \bar{a}^{2} }}{\lambda \mu c}\bar{p} } \right)\left( - \right)\)
- \(t\) :
-
Dimensionless time period \(\left( { = \frac{{2\pi c \bar{t}}}{\lambda }} \right)\)
- \(f\) :
-
Fluid phase
- \(nf\) :
-
Nanofluid
- \(s\) :
-
Solid particles
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The authors would like to express their sincere thanks to the reviewers for their valuable comments and suggestions.
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Abdel-wahed, M.S., Sayed, A.Y. Hybrid/mono-carbon nanotubes–water flow in a peristaltic curved channel with viscous dissipation. Eur. Phys. J. Plus 136, 979 (2021). https://doi.org/10.1140/epjp/s13360-021-01958-z
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DOI: https://doi.org/10.1140/epjp/s13360-021-01958-z