Abstract
Most of the studies on thin nanoliquid film flow over a stretching surface are primarily confined to only one type of metallic/nonmetallic nanoparticles suspended on the Newtonian base liquid. This article, on the other hand, investigates the development of thin non-Newtonian Casson hybrid nanolquid (CHNL) film over an unsteady porous stretching sheet in presence of transverse magnetic field. Here, more than one type of metallic/nonmetallic nanoparticles are suspended in the non-Newtonian Casson base liquid. Using the appropriate similarity transformations, the entire set of energy and momentum equations are transformed into a set of coupled non-linear partial differential equations. The singular perturbation technique and matched asymptotic method have been used to find analytical expressions for the temperature and velocity fields. Finally, the longtime film evolution equation is solved numerically by Runge–Kutta method of order four. The results shows that the film height for CHNL enhances for increasing values of nanoparticles volume fractions, Casson parameter, porosity parameter and Hartmann number respectively. It is seen that thermocapillary parameter accelerates film thinning rate when the sheet is cooling along the stretching direction whereas reverse phenomenon occurs for heating. It is noticed that the temperature attends larger values for CHNL as compared to pure Casson liquid and this temperature increases for raising the nanoparticles volume fractions in case of CHNL. A curve within the CHNL film may be described which demarcates the heat transfer region into two sections. In one section, heat is transferred from CHNL film to the stretching surface whereas, on the other section, heat is transferred from stretching sheet to CHNL film.
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Abbreviations
- \(B_0\) :
-
Magnetic field (T)
- \(C\) :
-
Constant \(({\text {s}}^{-1})\)
- \((C_p)_{hnf}\) :
-
Heat capacity \(\left( {\text {J/kg K}}\right)\)
- \(e_{ij}\) :
-
Deformation rate \(({\text {s}}^{-1})\)
- \(h\) :
-
Film thickness \(\left( {\text {m}}\right)\)
- \(h_0\) :
-
Initial film thickness \(\left( {\text {m}}\right)\)
- \(H\) :
-
Hartmann number
- \(k_{hnf}\) :
-
Thermal conductivity \(\left( {\text {W/m K}}\right)\)
- \(L\) :
-
Length scale along x directions \(\left( {\text {m}}\right)\)
- \(P\) :
-
Pressure \(\left( {\text {Pa}}\right)\)
- \(P_a\) :
-
Atmospheric pressure \(\left( {\text {Pa}}\right)\)
- \(P_s\) :
-
Porosity parameter
- \(P_z\) :
-
Yield stress (Pa)
- \(Pr\) :
-
Prandtl number
- \(Q\) :
-
Similarity for pressure \(\left( {\text {Pa/m}}^2\right)\)
- \(R\) :
-
Similarity for pressure \(\left( {\text {Pa}}\right)\)
- \(Re\) :
-
Reynolds number
- \(t\) :
-
Stretching time \(\left( {\text {s}}\right)\)
- \(T\) :
-
Temperature \(\left( {\text {K}}\right)\)
- \(T_0\) :
-
Temperature of the sheet at the initial time (K)
- \(T_1\) :
-
Constant \(({\text {K/m}}^2)\)
- \(u\) :
-
Velocity component along x-axis \(\left( {\text {m/s}}\right)\)
- \(U_0\) :
-
Characteristic velocity \(\left( {\text {m/s}}\right)\)
- \(v\) :
-
Velocity component along y-axis \(\left( {\text {m/s}}\right)\)
- \(W\) :
-
Similarity velocity along y-axis \(\left( {\text {m/s}}\right)\)
- \(x\) :
-
Co-ordinate along streching sheet
- \(y\) :
-
Co-ordinate perpendicular to streching sheet
- \(\alpha\) :
-
Thermocapillary parameter
- \(\beta\) :
-
Casson fluid parameter
- \(\eta\) :
-
Similarity variables for temperature \(\left( {\text {K}}\right)\)
- \(\kappa '\) :
-
Permeability of the porous medium \(({\text {m}}^2)\)
- \(\mu\) :
-
Dynamic viscosity \(\left( {\text {kg/m s}}\right)\)
- \(\nu\) :
-
Kinematic viscosity \(\left( {\text {m}}^2/{\text {s}}\right)\)
- \(\pi\) :
-
Product of deformation rate \(({\text {s}}^{-2})\)
- \(\pi _c\) :
-
Critical value of \(\pi\) \(({\text {s}}^{-2})\)
- \(\phi\) :
-
Volume fraction
- \(\phi ^{'}\) :
-
Porosity of the porous medium
- \(\phi _1\), \(\phi _2\), \(\phi _3\) :
-
Dimensionless constants
- \(\psi\) :
-
Similarity velocity along x-axis \(\left( {\text {m/s}}\right)\)
- \(\rho\) :
-
Density \(({\text {kg/m}}^3)\)
- \(\sigma\) :
-
Surface tension \(\left( {\text {kg/s}}^2\right)\)
- \(\sigma _0\) :
-
Surface tension at initial time \(\left( {\text {kg/s}}^2\right)\)
- \(\sigma _e\) :
-
Electric conductivity (S/m)
- \(\tau _{ij}\) :
-
(i, j)-th Component of the stress tensor \(\left( {\text {Pa}}\right)\)
- \(\theta\) :
-
Similarity variables for temperature \(\left( {\text {K/m}}^2\right)\)
- \(\triangle T\) :
-
Constant \(\left( {\text {K}}\right)\)
- \(hnl\) :
-
Hybrid nanoliquid
- \(l\) :
-
Base liquid
- \(nl\) :
-
Nanoliquid
- \(s_1\) :
-
Nanoparticle 1
- \(s_2\) :
-
Nanoparticle 2
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Acknowledgements
Yogen Ghatani extends his gratitude to SMIT, Sikkim Manipal University for its support with the TMA PAI RESEARCH project (6100/SMIT/R &D/Project/19/2019).
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Ghatani, Y., Maity, S., Roshan, T. et al. Film thinning and heat transfer analysis of Casson hybrid-nanoliquid flow over an unsteady permeable stretching sheet in presence of magnetic field. Eur. Phys. J. Plus 138, 732 (2023). https://doi.org/10.1140/epjp/s13360-023-04257-x
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DOI: https://doi.org/10.1140/epjp/s13360-023-04257-x