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Threedimensional boundary layer flow and heat/mass transfer through stagnation point flow of hybrid nanofluid
Journal of Engineering and Applied Science volume 71, Article number: 57 (2024)
Abstract
This project covers the investigation of the boundary layer flow of a hybrid nanofluid past a biaxial stretching/shrinking sheet. The hybrid nanofluid consists of copper (Cu) and alumina (\({Al}_{2}{O}_{3}\)) nanoparticles, which are diluted into water to form \(Cu{Al}_{2}{O}_{3}\) water hybrid nanofluid. The governing partial differential equations (PDEs) are derived from NavierStokes equations. The system of PDEs is reduced to a system of ordinary differential equations using an appropriate similarity transformation. MATLAB’s bvp4c function is used to numerically solve the resulting system of governing ordinary differential equations. The aim of this study is to gain a comprehensive understanding of the intricate behavior displayed by hybrid nanofluids on the stagnant directed flow of extended/shrunk flat surfaces, considering the effects of Brownian motion, thermophoresis, and various nanoparticles. The generated numerical results of flow profiles, skin friction coefficient, and Nusselt number have been presented graphically and discussed in the relevance of the governing parameters contributing to the flow. The outcomes reveal that the velocity components are reduced with increasing \({Al}_{2}{O}_{3}\) water nanofluid volume fraction. A monotonical increase in the parameters stretching/shrinking and suction/injection with a corresponding rise in both nanoparticles volume fraction propels heat gradient rate. An increase in the Schmidt numbers encourages a mass transfer field due to an enhanced boundary viscosity. The validation of numerical results is done with previously published results. Through our results, we have found that the performance of a hybrid nanofluid is more significant than other fluids. In addition, this study enhances the progress of theoretical comprehension by endeavoring to resolve the intricate interplay between fluid dynamics and thermal characteristics through the utilization of numerical approaches.
Introduction
Heat transfer improvement research has gotten much attention for the past few years. Thermal researchers have proposed that nanosized metallic or nonmetallic particles be added to the base fluid to increase thermal conductivity since nanoparticles have a better thermal conductivity than the base fluid. Nanofluid is the name given to the resultant combination that has improved physical and chemical characteristics. Choi [1] studied the phenomena of nanoparticles floating in a base fluid and coined the term “nanofluid”. The most crucial aspect of nanofluid is that coagulation may be reduced. The use of suitable surfactants and homogeneous particle dispersion can further reduce congestion. The transport mechanism of nanofluids greatly improves the thermal performance of various base liquids. The inclusion of certain base materials induces the breakdown of metallic particles in nanofluids. The metallic particles are capable of trapping particles that are small in size and diameter. The main purpose of nanoparticles is to enhance the heat transfer phenomena. They have various applications in the industrial framework and applied thermal engineering. Possible uses of nanofluids include cooling systems, hydraulic systems, solar panels, power generation, etc. Several researchers have recently studied the synthesis, production, and characterization of various nanofluids for diverse heat transfer applications. Many numerical and experimental findings have been presented on different amalgamations of nanoparticles and base fluids. Al, Cu, Fe (metals), Al_{2}O_{3}, CuO (metal oxides), SiO_{2}, and TiO_{2} (nanoparticles) are some of the most often utilized nanoparticles (semiconductors). Many references to nanofluids may be found in literature, which is worth noting [2,3,4].
A hybrid nanofluid is a homogenous combination of duplet or supplementary nanoparticles with unique physical and chemical relations. As a result of the combined impact, the fundamental goal of hybrid nanofluids is to produce results in thermophysical, hydrodynamic, and heat transmission characteristics as contrasted to mono nanofluids [5]. Even at low particle densities, the requisite heat transfer effect may be achieved by hybridizing the suitable mix of nanoparticles [6]. Because hybrid nanofluids are a new fluid type, more reviews must be done on their synthesis and processing [7]. Review publications such as [8,9,10] provide a complete overview of hybrid nanofluids for additional study. The numerical analyses on the hybrid nanofluid are regarded as a novel addition to the boundary layer flow theory by the researchers. For further information, consult [8,9,10], which provide a complete overview of hybrid nanofluids. The numerical investigations on the hybrid nanofluid have been regarded as a significant contribution to the boundary layer flow theory by the researchers. Devi and Devi [11], for example, investigated the flow of a hybrid nanofluid through a stretched surface using Cu–Al_{2}O_{3} nanoparticles with magnetic effects. They discovered that the heat transfer rate of a hybrid nanofluid is higher than that of a conventional nanofluid. The problem was then expanded to a threedimensional flow subject to the Newtonian heating condition [12]. Rostami et al. [13] investigated a silica–alumina hybrid nanofluid’s mixed convective flow at a stagnation point. Waini et al. [14] studied the dual approaches to the flow of a hybrid nanofluid with heat exchange along an extending or contracting surface while acknowledging unsteady flow.
Extrusion operations, expanding balloons, an extension of pseudopods, glass blowing, hot rolling, wire drawing, paper manufacturing, glass blowing, plastic film drawing, and glassfiber production are all examples of sectors where flow due to a stretched surface is a significant issue. The heat transmission rate at the stretching surface determines the final product’s quality. Wang [15] was the first to investigate threedimensional flow across a biaxially stretched flat surface using an axisymmetric stretching surface. Using the similarity transformation, the NavierStokes equations are reduced to a set of nonlinear ordinary differential equations, which are then numerically integrated using the shooting technique. After that, [16] expanded this study to include unsteady flow and heat and species transmission. In addition, other writers, such as [17,18,19,20], have studied flow across a biaxial flat surface. However, the previous sources should have considered the fluid’s lateral movements away from the surface. It’s worth noting that [21] examined uniform flow across a biaxial stretching surface with the fluid moving laterally away from the surface. According to the author, the lateral stretching enhanced the net shear stress and drag caused by the uniform flow. Using the nanofluid model given by [22, 23] expanded this study to nanofluid flow across a stretching/shrinking sheet. Abbas et al. [24] predicted the significance of MHD and slip effects with the interaction of hybrid nanoparticles in stagnated points. Nadeem et al. [25] visualized the nanomaterial properties with base viscoelastic micropolar fluid in an extended sheet. Abbas et al. [26] disclosed the hybrid nanofluid thermal prediction in nonlinear curved surfaces via numerical analysis. Li et al. [27] determined the hybrid nanomaterials base maxwell micropolar analysis with heat transfer phenomenon. Abbas and Shatanawi [28] included the MicropolarCasson analysis numerically over exponentially extending Riga plate with the support of nanofluid.
Therefore, the aim of the present article is to investigate the uniform flow and heat transmission of a hybrid nanofluid over a permeable biaxial stretching/shrinking sheet using copper (Cu) and alumina (Al_{2}O_{3}) nanoparticles. To create a hybrid nanofluid, these nanoparticles are suspended in water. The study of these fluid models has gained significant importance in the present technoindustrial period due to their increasing demand in various technical and manufacturing processes. The flux mixture can be mathematically described by a complex equation that requires a numerical solution. To solve this equation, the transformation governing equations along with the corresponding boundary conditions are solved numerically using the boundary value problem solver (bvp4c) in MATLAB function. The current numerical findings are compared to previously released data for validation reasons. The findings may be highly beneficial in raising the energy efficiency of thermal systems.
Methods
Geometry formulation
Figure 1 depicts the constant flow of a hybrid nanofluid across a permeable transverse direction flexion and extension flat surface, with x and ycoordinates in the surface plane and z measured in the plane perpendicular to the xy plane. The flat surface is stretched/shrunk continuously in both the x and ydirections with the velocities \(u={u}_{w}(x,t)\) and \(v={v}_{w}(x,t)\). Far from the surface at \(z\to \infty\), there is a uniform flow of velocity \({u}_{e}=U\). Another assumption is that the constant mass flux velocity is \(w={w}_{0}\), where \({w}_{0}<0\) is for suction and \({w}_{0}>0\) is for injection. Because nanofluids are manufactured as a stable combination of nanoparticles and the base fluid, the size of the particles in hybrid nanofluids is presumed to be uniform, and the effects of nanoparticle aggregation on thermophysical characteristics are neglected.
Under these conditions, the governing equations of the hybrid nanofluid are [12, 21, 23]:
Initial and Boundary conditions are the following:
Mathematical analysis and similarity transformation
Use the following similarity variables [21, 23]:
Using the above, we get
Boundary conditions:
Where
Equation (14) represents the dimensionless terms obtained from Eqs. (9)–(13) are named (Pr) Prandtl number, Brownian motion parameter \(\left(Nb\right),\) thermophoresis parameter \(\left(Nt\right),\) surface mass parameter \(\left(S\right)\) with suction \(\left(S>0\right)\) and injection \(\left(S<0\right)\), Schmidt number \(\left(Sc\right)\), and ratio of nanoparticle materials to effective heat capacity \(\left(\tau \right)\).
The nanofluid constants are defined as follows:
Physical interests like Skin friction coefficient, Nusselt number, and Sherwood number in dimensionless form are defined as:
Where subscript base, cap R e, end base, sub x equals numerator, cap U sub w, x end numerator, over upsilon sub f is the local Reynolds number and the thermophysical characteristics of the base fluid, and nanoparticles and characteristics of nanofluid are presented in Tables 1 and 2.
Solution procedure
The boundary conditions (13) and the resultant nonlinear ordinary differential Eqs. (9)–(12) are calculated using the bvp4c solver in the MATLAB program. For this method, first transformed the higherorder system of equations is transformed into the firstorder system of equations. Further calculations in Bvp4c set the guess value of all known and unknown functions. Starting with a guess at an initial mesh point, the results are generated by increasing the step size until the requisite precision is reached. Based on the values of the parameters used, the appropriate beginning estimate and boundary layer thickness must be chosen. The proposed numerical code is known as the following:
Boundary conditions:
Previous research has successfully calculated and confirmed the use of bvp4c codes to solve both steady flow and normalizing stability equations. The computations in this study are done using\({\eta }_{\infty }=5\). Tolerance is considered in this problem \({10}^{4}\). As is generally the case in boundary layer analysis, the progressive boundary conditions go to infinity and are substituted with those at a large but finite value has no significant change in velocity, temperature, etc., occurs (Fig. 2).
Numerical validation
In order to estimate the validity of the numerical analysis, a comparison of skin friction \({f}^{{\prime}{\prime}}\left(0\right)\) and \({h}^\prime\left(0\right)\) as well as the heat transfer coefficient in Table 3. The findings for \({f}^{{\prime}{\prime}}\left(0\right),{h}^\prime(0)\) and \({\theta }^\prime(0)\) were compared to those previously published results [21] for \({\varphi }_{1}={\varphi }_{2}=0\), \(Pr=7,Nb=0.5,Nt=0.3,\lambda =1,Sc=1,S=2\) to ensure the validity and correctness of the current study. This table shows that the abovementioned paper and this table are in good accord.
Results and discussion
In this article, the heat and mass transfer analysis find out \(Cu{Al}_{2}{O}_{3}\) water hybrid nanofluid in stagnation point flow of biaxial stretching/shrinking sheet geometry. Aqueousbased fluid medium considers two kinds of nanoparticles (cap C u minus subscript base, cap A. l, end base, sub 2, cap O sub 3). Further twophase model is incorporated in the study. The reduced nonlinear Eqs. (9)–(12), along with boundary conditions Eq. (13) are numerically solved with MATLAB’s bvp4c function to generate results. The physical, vital quantities flow profiles such as Skin friction \({f}^{{\prime}{\prime}}\left(0\right)\), Nusselt number \({\theta }^\prime\left(0\right)\), Shearwood number \(\phi ^\prime\left(\eta \right)\), velocity \({f}^\prime\left(\eta \right)\) and \(h\left(\eta \right)\), temperature \(\theta \left(\eta \right)\) and volume fraction \(\phi \left(\eta \right)\) profiles are investigated, for different values of the parameters and depicted through graphs.
The response of the flow dimensions for the \({Al}_{2}{O}_{3}Cu/\) water hybrid nanofluid to varying nanoparticle volume fraction is demonstrated in Figs. 3, 4, and 5. A decrease in the flow momentum \(f^\prime(\eta )\) and axial flow momentum \(h(\eta )\) are obtained due to a rising stretchy sheet that caused the ambient heat diffusion as seen in Figs. 3 and 4. As such, nanoparticle interaction is damped as a result of an enhanced molecular bonding and the fluid flow stagnation point. This resulted in a boosted fluid bonding force, and heat dissipation discouraged the flow velocity along the boundless stream domain, thereby decreasing the velocity profiles. Meanwhile, in Fig. 5, the temperature distribution is propelled with a rising nanoparticle volume fraction, the effect is less pronounced due to the combined influence of the stagnation point and wall stretching velocity that dominated the heat generation. Hence, the temperature profile is gradually enhanced. The respective impact of the Brownian motion \(\left(Nb\right)\) and the thermophoresis term \((Nt)\) on the heat distribution and species reaction are depicted in Figs. 6, 7, 8, and 9. Both the heat and mass distributions decreased with an increasing Brownian motion value as noticed in Figs. 6 and 7. The random collision of nanoparticles with the fluid surrounding molecules is reduced across the flow regime. The suspended nanoparticles in waterbased fluid are restricted in movement due to lower heat generation and fluid stagnation. Whereas the temperature profile and mass transfer field are raised as the thermophoresis values are boosted as offered in Figs. 8 and 9. The thermophoresis effect is experienced in moving particle mixture, in which particles respond differently to heat gradient force. This phenomenon moves light and heavy particles to hot and cold regions correspondingly. The force generated caused the \({Al}_{2}{O}_{3}/Cu\) water hybrid nanofluid heat distribution and species mixtures field to increase momentously all over the stream regime as observed in the plots.
Figure 10 presents the impact of a rise in the Schmidt number on the mass transfer. The species concentration distribution is enhanced due to a rising viscosity of the mass boundary layer. As seen, the kinematic viscosity ratio to the molecular diffusion coefficient is inspired to raise the concentration profile. The hybrid nanofluids chemical mixtures are encouraged to stimulate heat transfer, thereby raising the mass transfer. In Figs. 11, 12, and 13, the influence of \({Al}_{2}{O}_{3}({\text{alumina}})\) nanoparticle fractional volume on the engineering wall quantities is established. The wall effect along an increasing stretchy sheet for different numbers of \({\varphi }_{1}\) discouraged the wall friction, the nanoparticles exert force on the water base fluid. Thus, the momentum boundary viscosity is enhanced, decreasing the wall friction. However, the term \({\varphi }_{1}\) increased the temperature gradient due to rapid changes in the temperature around a nanoparticle position. This leads to an upsurge in the Nusselt number along the increasing pliable sheet. Meanwhile, the mass gradient profile in Fig. 13 reduced for a rising value of \({\varphi }_{1}\) along the far stream of, cap A. l, end base, sub 2, cap O sub 3nanoparticle difference creates chemical molecular mixtures, stimulating particles boding, thereby reducing the Sherwood number field.
Likewise, Figs. 14, 15, and 16 show the strength of the \(Cu \,({\text{copper}})\) volume fraction variation across the raised stretching wall for the plate friction, thermal gradient, and Sherwood number. The effect of \({\varphi }_{2}\) on the physical quantities is more pronounced for Cu nanoparticles than the \({Al}_{2}{O}_{3}\) nanoparticles volume fraction \({\varphi }_{1}\) for the respective physical engineering quantities. This is because the dispersion of Cu nanoparticles in water caused particle collision and heat generation than the subscript base, heat generation than the \({Al}_{2}{O}_{3}\) nanoparticle. From Figs. 17, 18, 19, 20, 21, and 22, the respective effect of \({Al}_{2}{O}_{3}\) and Cu nanoparticle volume fraction on the thermoengineering fluid quantities are investigated for more significant an increasing suction \(\left(S>0\right)\). A variation in \({\varphi }_{1}\) and \({\varphi }_{2}\) with the rising wall suction term individually influenced the wall fluid friction, plate heat gradient, and stretchy wall concentration gradient. As displayed in Figs. 17, 18, and 19, an expanding value of \({Al}_{2}{O}_{3}\) volume fraction \({\varphi }_{1}\) decreased the skin friction due to shrinkage in the velocity boundary viscosity, but the Nusselt number field increased due to rising nanoparticle interaction that leads to rising thermal conductivity. Meanwhile, the Sherwood number profile decreased due to a reduced mass transfer at the stretchy wall. As exhibited in Figs. 20, 21, and 22, increasing the Cu volume fraction \({\varphi }_{2}\) concerning rising suction term along the boundless stream correspondingly enhanced the wall friction and the thermal gradient profile as offered in Figs. 20 and 22. This resulted from the rising internal heating that propels heat transfer, thereby diminishing the molecular bonding. Hence, the thermophysical quantities, skin drag force, and Nusselt number profiles at the bounded flow device increased. But in Fig. 22, the chemical reaction gradient decreased along the rising suction term because of the low interaction between the \({Al}_{2}{O}_{3}\) and Cu nanoparticles. Therefore, the Sherwood number profile was reduced across the flow suction at the elongated sheet.
Conclusions
This study uses a twophase nanofluid model to solve the unsteady boundary layer problem of stagnation point flow of a hybrid nanofluid past a biaxial stretching/shrinking sheet. Investigation of two different nanoparticles, namely Copper and Alumina, which are diluted into water to form \(Cu{Al}_{2}{O}_{3}\) water hybrid nanofluid, was undertaken to make the analysis more appealing. The results for flow heat, mass transfer, and physically necessary quantities flow profiles are displayed by graphs. The main points are listed below:

A monotonical increase in the terms \(\lambda\) and \(S\) with a corresponding rise in the nanoparticles \({Al}_{2}{O}_{3}\) and \(Cu\) volume fraction propels heat gradient rate.

The wall friction and mass gradient reduce for a rise in the nanoparticle dispersion in water along the far streams \(\lambda\) and \(S\).

The velocity components are reduced with increasing \({Al}_{2}{O}_{3}\) water nanofluid volume fraction.

Thermal conductivity of the \({Al}_{2}{O}_{3}/Cu\) water hybridization is enhanced with expanded physical terms \({\varphi }_{1}\) and \(Nt\).

An increase in the Schmidt numbers encourages a mass transfer field due to an enhanced boundary viscosity.
The current study and the investigated flow dimension results will assist the thermal engineering and chemical production in the correct hybridization of nanofluid for improved productivity. Hence, further analysis of nanomaterials coupled with nonNewtonian fluids under various geometries is encouraged to enhance nanotechnology development.
Nomenclature
\(\left(x ,y ,z\right)\) Cartesian coordinates
\(\left(u,v,w\right)\) Velocity component in the x, y, and z – directions
\({u}_{e}\) Velocity of the free stream
\({C}_{f}\) Skin friction coefficient
\({C}_{p}\) Specific heat at constant pressure
\({(\rho {C}_{p})}_{nf}\) Heat capacitance of the nanofluid
\({(\rho {C}_{p})}_{f}\) Heat capacitance of the fluid
\({(\rho {C}_{p})}_{hnf}\) Heat capacitance of the hybrid nanofluid
\({\vartheta }_{f}\) Kinematic viscosity of the fluid
\({\vartheta }_{nf}\) Kinematic viscosity of the nanofluid
\({\vartheta }_{hnf}\) Kinematic viscosity of the hybrid nanofluid
\({\mu }_{f}\) Dynamic viscosity of the fluid
\({\mu }_{nf}\) Dynamic viscosity of the nanofluid
\({\mu }_{hnf}\) Dynamic viscosity of the hybrid nanofluid
\(\eta\) Dimensionless variable
\(f\left(\eta \right)\) Dimensionless stream function
k Thermal conductivity of the fluid
\(\theta\) Dimensionless temperature
\(\lambda\) Stretching/shrinking parameter
\({\text{Pr}}\) Prandtl number
\({q}_{w}\) Surface heat flux
\({Re}_{x}\) Local Reynolds number
\({\text{t}}\) Time
T Fluid temperature
\({T}_{w}\) Surface temperature
\({T}_{\infty }\) Ambient temperature
\({\rho }_{f}\) Density of the fluid
\({\rho }_{nf}\) Density of the nanofluid
\({\rho }_{hnf}\) Density of the hybrid nanofluid
\(\psi\) Stream function
\({\varphi }_{1}\) Nanoparticle volume fractions for Al_{2}O_{3} (alumina)
\({\varphi }_{2}\) Nanoparticle volume fractions for Cu (copper)
Subscripts
\({\text{f}}\) Base fluid
\({\text{nf}}\) Nanofluid
\({\text{hnf}}\) Hybrid nanofluid
\(s1\) Solid component for Al_{2}O_{3} (alumina)
\(s2\) Solid component for Cu (copper)
Availability of data and materials
Upon request to the corresponding author.
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Ferdows, M., Shamshuddin, M., Rashad, A.M. et al. Threedimensional boundary layer flow and heat/mass transfer through stagnation point flow of hybrid nanofluid. J. Eng. Appl. Sci. 71, 57 (2024). https://doi.org/10.1186/s44147024003889
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DOI: https://doi.org/10.1186/s44147024003889