Mixed Convection Flow Of Nanofluid Research Articles

Mixed Convection Nanofluid Flow with Heat Source and Chemical Reaction over an Inclined Irregular Surface.

Two-dimensional mixed convection radiative nanofluid flow along with the non-Darcy permeable medium across a wavy inclined surface are observed in the present analysis. The transformation of the plane surface from the wavy irregular surface is executed via coordinate alteration. The fluid flow has been evaluated under the outcomes of heat source, thermal radiation, and chemical reaction rate. The nonlinear system of partial differential equations is simplified into a class of dimensionless set of ordinary differential equations (ODEs) through a similarity framework, where the obtained set of ODEs are further determined by employing the computational technique parametric continuation method (PCM) via MATLAB software. The comparative assessment of the current outcomes with the earlier existing literature studies confirmed that the present findings are quite reliable, and the PCM technique is satisfactory. The effect of appropriate dimensionless flow constraints is studied versus energy, mass, and velocity profiles and listed in the form of tables and figures. It is perceived that the inclination angle and wavy surface assist to improve the flow velocity by lowering the concentration and temperature. The velocity profile enhances with the variation of the inclination angle of the wavy surface, non-Darcian term, and wavy surface term. Furthermore, the rising value of Brownian motion and thermophoresis effect diminishes the heat-transfer rate.

Computational analysis of the transient mixed convective flow of nanofluid in the plume regions

Computer microchips and many other electrical devices that use microfluidics use nanofluids as coolants. Nanofluids have a higher thermal conductivity due to the volumetric proportion of nanoparticles. Thus, as the nanofluids in engineering and industrial process have a significant role, the current study aims to focus on the transient mixed convective flow of nanofluid in the plume regions. The numerical solutions for the transient mixed convection flow in the form of amplitude and phase angle are performed reasonably. The desired nonlinear mathematical model is created by incorporating periodic behavior into conservation equations and appropriate boundary conditions. Using appropriate scaling variables, the dimensioned equations are transformed into dimensionless ones. Solutions for the values of Prandtl number Pr, Schmidt number Sc, thermophoretic parameter Nt, Brownian motion parameter Nb and mixed convection parameters and show that the coupling between the fluid and heat transfer can have dramatic effects on the transient shear stress heat and mass transfer. The buoyancy force acting on the heated boundary layer of nanofluid can also have a significant impact on transient skin friction, heat and mass transfer. The governing process is accelerating or depending upon the position of the sphere.

Inclined surface slip flow of nanoparticles with subject to mixed convection phenomenon: Fractional calculus applications

The interest of researchers towards the nanofluids is noticed in recent years due to leading applications in thermal systems and industrial framework. Referring to such motivations, current study explores the role of velocity slip effects for the mixed convection flow of nanofluid endorsed due to inclined surface. The Casson base fluid model for which the thermal impact needs to be improved. The analysis is observed when the role of velocity slip is important. The modeling of unsteady free convective flow problem yields partial differential system. The Atangana-Baleanu (AB) and Caputo-Fabrizio (CF) fractional operators are implemented in order to simulates the computation of problem. The graphical presentations are prepared in order to check the physical dynamic of parameters.

Numerical investigation of unsteady MHD mixed convective flow of hybrid nanofluid in a corrugated trapezoidal cavity with internal rotating heat-generating solid cylinder

Numerical investigation of unsteady MHD mixed convective flow of hybrid nanofluid in a corrugated trapezoidal cavity with internal rotating heat-generating solid cylinder

Unsteady mixed convective stagnation point flow of hybrid nanofluid in porous medium

Unsteady mixed convective stagnation point flow of hybrid nanofluid in porous medium

Non-similar modeling for the stagnation point mixed convection nanofluid flow with the temperature-dependent variable viscosity

In this work, a modified model for heat and mass transfer of mixed convection nanofluid flow over a stretching sheet is investigated. The model is described in form of partial differential equations (PDEs) and further, it is reduced to a dimensionless system of nonlinear PDEs. The main feature of the current study is to employ a non-similarity method that can be used for non-similar problems. The coupled ordinary differential equations are tackled by the MATLAB built-in solver bvp4c. The graphs for velocity, temperature, and concentration profiles are obtained with varying dimensionless parameters. Also, numerical values for quantities of physical interest skin friction coefficient, local Nusselt number and local Sherwood number are given through tables. By considering the effects of variable viscosity, an increase in velocity profile is found for growing values of the Grashof number.

Impact of Variable Viscosity, Activation Energy on MHD Mixed convective Heat and Mass Transfer Flow of a Nanofluid in a Cylindrical Annulus

We explore the impact of variable viscosity, activation energy on MHD mixed convective heat and mass transfer flow of nanofluid through a porous medium in a Co-axial cylindrical duct. The non-linear, coupled equations have been solved by using Galerkine finite method with quadratic polynomials. The behaviour of velocity, temperature and nanoconcentration is analyzed at different axial positions. The rate of heat and mass transfer has also been obtained for variations in the governing parameters. From the analysis we find that an increase in Nb and Nt reduces the velocity, increases the temperature and nanoconcentration.

Heat and mass transfer analysis of nonlinear mixed convective hybrid nanofluid flow with multiple slip boundary conditions

The current study focuses on the 3D nonlinear mixed convective boundary layer flow of micropolar hybrid nanofluid in the presence microorganism and multiple slip conditions across the slendering surface. The concentration and energy equations are developed in the occurrence of activation energy and joule heating effect. The aim of this research is to consider the Carbon nanotubes (CNTs) which are favored materials in the manufacture of electrochemical devices because of their mechanical and chemical stability, good thermal and electrical conductivities, physiochemical consistency, and featherweight. By keeping such extraordinary properties of carbon nanotubes in mind, we investigate the flow of hybrid nanofluid having MWCNT (multi-wall carbon nanotubes) and SWCNT (single-wall carbon nanotubes). Using an appropriate similarity variable, the flow model (PDEs) are converted into nonlinear ordinary differential equations. The bvp4c approach is utilized to tackle the coupled differential equations. The impact of emerging parameter on temperature distribution, velocity field, concentration distribution, and microorganism field are presented graphically. It is noted the stronger values of wall thickness parameter and Hartmann number produces retardation effect, as a result fluid velocity declines for both SWCNT (single-wall carbon nanotubes) and MWCNT (multi-wall carbon nanotubes) hybrid nanofluid. Furthermore, the transport rate of heat and mass improves by the higher values of φ 2 for both simple and hybrid nanofluid.

Linear stability perspective on mixed convection flow of nanofluids in a differentially heated vertical channel

We report instability properties of mixed convection flow of different nanofluids in a differentially heated vertical channel through a linear stability analysis. A single-phase nanofluid model is used to report the instability mechanism of nanofluids, which fairly works for the low concentration of the nanoparticles. The stability results are examined for five different types of water-based nanofluids. The basic flow and linear disturbance equations are solved with the Chebyshev spectral collocation method. The influence of nanoparticles volume fraction (φ) in different water-based nanofluids is analyzed in terms of growth rate analysis, instability boundaries and kinetic energy analysis. The results reveal that increasing the concentration of nanoparticles in the water improves the stability of the basic flow. However, increasing the Reynolds number (Re) value destabilizes the basic flow of nanofluid due to the dominant nature of the shear force. Compared to conventional pure water fluid, the inclusion of nanoparticles in pure water delays the onset of instabilities by reducing the growth of the disturbance. The order of stability for different nanofluids in (φ,Gr/Re)-plane is observed as: Al2O3/water >TiO2/water >CuO/water >Cu/water >Ag/water nanofluid, where Gr is Grashof number. By increasing the volume percentage of nanoparticles, the friction coefficient at the heated wall of the channel decreases. The kinetic energy balance at the critical level shows that shear instability is the most dominant instability for considered nanofluids.

Quadratic mixed convective nanofluid flow past a moving yawed cylinder in the presence of thermal radiation and diffusive liquids

AbstractThe fluid flow around a yawed cylinder helps to understand the practical implications for undersea applications, such as managing transference, separating the boundary layer above submerged blocks, and suppressing recirculating bubbles. As many authors such as Roy, Chiu and Lienhard, Roy and Saikrishnan, and Revathi et al. have analyzed a boundary layer flow over a yawed cylinder, and their work sticks to only forced convection, we are interested to work on mixed convection flow. Therefore, the work of these researchers has stimulated us to work on the present article. As a result, we have examined the work on triple diffusion quadratic mixed convective nanofluid flow over a moving yawed cylinder. The impact of yaw angle, which exists due to the inclination of a vertically moving cylinder away from the origin, is mathematically investigated in the present paper by converting the governing equations into a compatible form using appropriate nonsimilar transformations and the quasilinearization technique. Nanofluids have crucial usages in science and technology, marine engineering, and applications in industries such as plastic, polymer industries, cancer home therapy, and building sciences. Many processes in new engineering areas occur at high temperatures, and knowledge of radiation heat transfer becomes very important for designing the pertinent equipment. Nuclear power plants, gas turbines, and the various propulsion devices for aircraft, missiles, satellites, and space vehicles are examples of such engineering areas. The finite difference approximation is employed to solve the resulting equations. Enhancing the magnitude of thermal radiation enhances the temperature of the liquid and the energy transport strength. However, liquid hydrogen and liquid oxygen species concentration patterns are reduced in nanofluid compared to traditional liquids. At the same time, the outcomes behave conversely in the case of their wall gradients. Furthermore, the temperature of the liquid enhances the enhancing values of Brownian motion and thermophoresis characteristics. Moreover, nanoparticle mass transport augments with enhancing yaw angle and Lewis number values. Both species' concentration profiles decrease for increasing values of yaw angle. The velocity profiles increase for increasing values of velocity ratio parameter in the spanwise and chordwise directions.

Implication of forced convective flow of nanofluid towards an exponentially stretched surface: Non-similar transformations

This article presents the numerical scrutiny of the non-similar model of mixed convective flow of nanofluid initiated by an exponentially expanding sheet. Equations are modeled and transformed into non-dimensional partial differential system (PDE's) by defining dimensionless [Formula: see text] as non-similarity variable, and [Formula: see text] as pseudo-similarity variable along with appropriate transformations. Graphical analysis for various dimensionless numbers such as thermophoresis [Formula: see text], ratio of mass and heat transfer Grashof numbers [Formula: see text], Brownian motion [Formula: see text], buoyancy parameter [Formula: see text], Eckert number [Formula: see text] and Lewis number [Formula: see text] is presented using local non-similarity (LNS) via finite difference based algorithm bvp4c. A raised flow profile wasobserved with increasing [Formula: see text] and N. Boost in thermal profile was noticed for lager [Formula: see text] Increasing N and [Formula: see text] decreases the temperature profile. The concentration was a decreasing function of [Formula: see text] and N and increasing function of [Formula: see text]

Analysis of Wu's slip and CNTs (single and multi-wall carbon nanotubes) in Darcy-Forchheimer mixed convective nanofluid flow with magnetic dipole: Intelligent nano-coating simulation

The analysis of viscous materials flow subject to diverse configurations with remarkable physical applications has many utilizations in the electrical, mechanical, industrial, applied physics and mathematics fields. Besides these, carbon nanotubes (CNTs) have numerous applications in energy storage, nanotechnology, chemical sensors, industry, optics, structural diverse materials and conductive plastics. Such consideration in mind, ferro-fluid flow of viscous liquid submerged in CNTs towards a stretchable surface affected by magnetic dipole interaction is addressed. Mixed convection and Darcy-Forchheimer effects are accounted. The energy relation is discussed in the presence of radiative heat flux and viscous dissipation. First and second order velocity slips are implemented at the boundary surface. The governing expressions specifying the flow are altered into ordinary ones with the assistance of appropriate similarity quantities. The obtained ordinary system is computationally tackled via Runge-Kutta 4th Order Method (RK4OM). Our obtained outcomes reveal that velocity of working fluid particles declines with an enhancement in ferromagnetic interaction parameter and Darcy-Forchheimer number. Also, behavior of temperature distribution increases more speedily for heightening of radiative parameter and Biot number. Coefficient of skin friction (surface drag force) and Nusselt number (heat transport rate) are calculated in view of important flow parameter numerically. The range of parameters are β=0.0,0.3,0.5,ε=0.1,0.5,1.0,Fr=0.1,0.5,1.0,γ1=0.0,0.5,1.0,γ2=0.0,0.1,0.2,δ=1.0,5.0,10.0,R=0.0,0.2,0.5,Bi=0.5,1.0,1.5 and.λ=0.0,1.0,3.0.

Influence of mixed convection nanofluid flow over a rotating sphere in the presence of diffusion of liquid hydrogen and ammonia

This work concentrates on the triple diffusive mixed convection nanofluid flow over a rotating sphere in view of cooling of rotating spherical products in various industries, machinery fields, heat and mass transfer applications. Diffusive components such as liquid hydrogen, ammonia, and nanoparticles have various practical applications for cooling in various industrial processes. This study is considered innovative because it examines the effect of multi diffusive components and nanoparticles on mixed convection flow over a rotating sphere reported for the first time. The physical problem is modelled mathematically as a set of coupled nonlinear dimensional partial differential equations. We employ the implicit finite difference scheme equipped with the Quasilinearization technique to solve the set of non-dimensional partial differential equations obtained via a non-similar approach. The numerical results are discussed through graphs. This work illustrates the significance of sphere rotations on flow, heat and mass transfer and boundary layer separation. This work also accounts for the impacts of thermophoresis and the Brownian motion of nanoparticles. The so obtained numerical results are compared with earlier results, and they are found to be in excellent agreement.

Thermal radiation and chemically reactive aspects of mixed convection flow using water base nanofluids: Tiwari and Das model

The current investigation focuses on the magneto-nanofluid mixed convective boundary-layer flow of nanofluid caused by a vertical permeable plate with nonlinear thermal radiation. Furthermore, heat and mass transfer for water-base fluids influenced by heat generation/absorption and viscous dissipation have been analyzed. The convective boundary condition is also imposed on the vertical sheet. The main aim of the study is to investigate the five different types of nanoparticles, namely, silver , copper , alumina copper oxide , and titanium dioxide in the base fluid water. Moreover, the governing partial differential equations are converted into a set of ordinary differential equations via Sparrow–Quack–Boerner local nonsimilarity method. Additionally, nonlinear ODEs are successfully tackled by the Runge–Kutta–Fehlberg method. Physical parameters are examined graphically along with the velocity, temperature, and concentration distribution. Further, the skin friction coefficient, local Nusselt number, and Sherwood numbers are also studied in detail using graphs. The results show that increasing the value of buoyancy parameter and magnetic parameter fluid exhibits more resistance in the fluid, thereby fluid velocity and momentum boundary layer reduce. Moreover, the radiation parameter transmitted more heat from the surface to the fluid; as a result, the fluid temperature is boosted.

Heat transfer analysis of the mixed convective flow of magnetohydrodynamic hybrid nanofluid past a stretching sheet with velocity and thermal slip conditions.

The present study is related to the analytical investigation of the magnetohydrodynamic flow of Ag − MgO/ water hybrid nanoliquid with slip conditions via an extending surface. The thermal radiation and Joule heating effects are incorporated within the existing hybrid nanofluid model. The system of higher-order partial differential equations is converted to the nonlinear system of ordinary differential equations by interpreting the similarity transformations. With the implementation of a strong analytical method called HAM, the solution of resulting higher-order ordinary differential equations is obtained. The results of the skin friction coefficient, Nusselt number, velocity profile, and temperature profile of the hybrid nanofluid for varying different flow parameters are attained in the form of graphs and tables. Some important outcomes showed that the Nusselt number and skin friction are increased with the enhancement in Eckert number, stretching parameter, heat generation parameter and radiation parameter for both slip and no-slip conditions. The thermal profile of the hybrid nanofluid is higher for suction effect but lower for Eckert number, stretching parameter, magnetic field, heat generation and radiation parameter. For both slip and no-slip conditions, the hybrid nanofluid velocity shows an upward trend for both the stretching and mixed convection parameters.

Computation of reactive mixed convection radiative viscoelastic nanofluid thermo-solutal transport from a stretching sheet with Joule heating

ABSTRACT As a model for electroconductive nanomaterials processing, the article examines incompressible mixed convection nanofluid flow with convective heat transport from a stretching sheet under the impact of Joule heating and radiative heat flux. The transformed non-linear boundary value problem is solved with a robust Chebyshev collocation technique. Validation is conducted with earlier published results. Nanoparticle concentrations are suppressed with increasing chemical reaction parameter and the effect is strongest for copperwater nanofluid and weakest for TiO2 water nanofluid. Increasing Biot number boosts the temperatures for copper and Al2O3 but reduces it for TiO2 nanoparticles. Increasing heat generation boosts temperatures strongly for Al2O3 and TiO2 nanoparticles but weakly for copper nanoparticles. Greater thermophoresis parameter strongly boosts temperatures but suppresses nanoparticle concentrations.

A numerical study on MHD double diffusive nonlinear mixed convective nanofluid flow around a vertical wedge with diffusion of liquid hydrogen

The present study focuses on double diffusive nonlinear (quadratic) mixed convective flow of nanoliquid about vertical wedge with nonlinear temperature-density-concentration variations. This study is found to be innovative and comprises the impacts of quadratic mixed convection, magnetohydrodynamics, diffusion of nanoparticles and liquid hydrogen flow around a wedge. Highly coupled nonlinear partial differential equations (NPDEs) and boundary constraints have been used to model the flow problem, which are then transformed into a dimensionless set of equations utilizing non-similar transformations. Further, a set of NPDEs would be linearized with the help of Quasilinearization technique, and then, the linear partial differential equations are transformed into a block tri-diagonal system through using implicit finite difference scheme, which is solved using Verga’s algorithm. The study findings were explored through graphs for the fluid velocity, temperature, concentration, nanoparticle volume fraction distributions and its corresponding gradients. One of the important results of this study is that the higher wedge angle values upsurge the friction between the particles of the fluid and the wedge surface. Rising Schmidt number declines the concentration distribution and enhances the magnitude of Sherwood number. Nanofluid’s temperature increases with varying applied magnetic field. The present study has notable applications in the designing and manufacturing of wedge-shaped materials in space aircrafts, construction of dams, thermal systems, oil and gas industries, etc.

Radiation and heat generation aspects on MHD convection of nanofluids in inclined wavy porous double lid-driven enclosures having obstacles: local thermal non-equilibrium

The present contribution focuses on the thermal non-equilibrium handling of an unsteady mixed convection nanofluid flow within two-sided wavy and two-sided lid-driven porous enclosures due to the impact of the thermal radiation and inclined magnetic field. The forced convection situation is due to the movements of the left irregular and top regular boundaries. This pattern accounts for such impacts as the inter-phase heat transfer factor impact, the modified conductivity ratio and the thermal radiation aspects. The cavity includes apart heated wall of length b subjected to external Cu water (with particle diameter less than 100 nm) nanofluid. The governing equations have been solved utilizing Galerkin finite element (GFE) approach with CBS algorithm. Numerical outcomes for the flow and heat transfer for the fluid and solid phases are determined for miscellaneous combinations of the physical factors. Graphical and tabular outcomes pointing out interesting features of the physics of the problem are presented and discussed. The forced convection mode is dominance at higher values of and low values of Hartmann number Ha. Furthermore, the considered range of the nanoparameter () gives an augmentation in the rate of the heat transfer up to 14.54%.

Mixed convective flow of a hybrid nanofluid between two parallel inclined plates under wall-slip condition

Mixed convective flow of a hybrid nanofluid between two parallel inclined plates under wall-slip condition

Effect of shape of nanoparticles on mixed convection nanofluid flow in a porous medium with variable permeability: Analysis of the second law of thermodynamics

Effect of shape of nanoparticles on mixed convection nanofluid flow in a porous medium with variable permeability: Analysis of the second law of thermodynamics