Different Shapes Of Nanoparticles Research Articles

Transient thermal behavior and efficiency in fully wet porous longitudinal fin: The influence of shape-dependent hybrid nanofluid and internal heat generation

The main focus of this study is to analyze the transient heat transfer characteristics of a convective–radiative longitudinal porous fin fully wetted in hybrid nanofluid along with internal heat generation. The Darcy formulation is considered for analyzing the velocity of the fluid passing through the fin and the Rosseland approximation determines the radiation heat flux. The hybrid nanofluid is obtained by immersing GO and Mo S 2 nanoparticles in the hybrid base fluid C 2 H 6 O 2 ‐ H 2 O . Furthermore, three different shapes of nanoparticles namely spherical, platelet, and blade have been selected for the investigation. The derived nonlinear partial differential equation is nondimensionalized and solved numerically by employing the finite difference method. The effect of shape factor, nanoparticle volume fraction, dimensionless time, wet porous parameter, radiation–conduction parameter, heat generation parameters, and other relevant parameters on the transient thermal analysis of the fin structure has been graphically analyzed and discussed. Furthermore, the transient thermal fin efficiency has been modeled and its variation with the significant parameters has been examined. One of the major outcomes is that efficiency increases with nanoparticle volume fraction. The examination has resulted in a novel outcome that the presence of hybrid nanofluid enhances the fin efficiency and also the high fin efficiency is achieved in the presence of blade-shaped nanoparticles. The findings of the investigation play a prominent role in the heat transfer enhancement of industrial processes.

Numerically analyzed of ternary hybrid nanofluids flow of heat and mass transfer subject to various shapes and size factors in two-dimensional rotating porous channel

This article examines the behavior of (Cu–Al2O3–TiO2) nanoparticles with varying shapes and sizes regarding their flow and thermal performance. A ternary hybrid MHD model is developed to study rotating porous walls associated with permeable Reynolds numbers and NPs for a specific range of the volume friction φ1,φ2 and φ3 (2%–10%). Considering morphology effects, the expanding/contracting phenomenon for heat and mass transfer enhancement is presented. Non-linear differential equations are derived from governing PDES and solved using the shooting procedure. The study aims to analyze the improvement in parameters such as stretching ratio parameter (α), nanoparticles volumetric fractions (φ1,φ2,φ3), magnetic parameter (M), Prandtl number (Pr) permeable Reynold number (Re), (Kcr) chemical reaction parameter, Schmidt number (Sc), and rotational parameter (R0) with ternary hybrid nanofluid (Cu–Al2O3–TiO2/water). The impacts of these parameters on the temperature profiles of different shapes of nanoparticles, such as spherical, brick, cylinders, and platelets, are also analyzed. The influences of these parameters (α), (φ1,φ2, φ3), (M), (Pr), (Re), (Kcr) (Sc) and (R0) impacts on skin friction coefficient, Nusselt number, and Sherwood number for different shapes and sizes of nanoparticles are discussed. The study suggests that platelet-shaped nanoparticles are more appropriate for non-dimensional physical parameters. Boosting Re, M, and R enlarges momentum boundary layers and enhances the radial velocity profile. Expanding the expansion ratio and volume of friction parameters influences heat transfer rates oppositely on the temperature profile. Elevating the Schmidt number diminishes the mass transfer rate in the upper boundary layer thickness but amplifies it in the lower boundary one in the concentration profile.

Nanoparticle Shape Effects of Aligned Magnetohydrodynamics Mixed Convection Flow of Jeffrey Hybrid Nanofluid over a Stretching Vertical Plate

This study investigates the nanoparticle shape effects of aligned magnetohydrodynamics (MHD) mixed convection flow of Cu-Al2O3/water-EG Jeffrey hybrid nanofluid over a stretching vertical plate. Five different shapes of nanoparticles which are spherical, cylindrical, blades, bricks, and platelets are considered in this study. The governing equations in the form of Partial Differential Equations (PDEs) had been reduced to nonlinear Ordinary Differential Equations (ODEs) by using similarity transformation. The solver bvp4c in MATLAB software was applied to numerically solve the dimensionless governing equations towards the physical parameters which are aligned angle of magnetic field, interaction of magnetic field, mixed convection, Deborah number, volume fraction of nanoparticles, and nanoparticle shape factor. The effects of nanoparticle shapes and other relevant thermophysical parameters on fluid velocity, temperature, skin friction coefficient and Nusselt number are discussed in tables and figures. In comparison of all shapes, this study found that blade shaped nanoparticles have the highest values of skin friction coefficient and Nusselt number. The parameters blobid0.pngblobid1.pngblobid2.png and blobid3.png decrease the velocity profiles but increase the temperature profiles.

Effect of Three Types of Magnetic-Field Modulation and Different Shapes of Nanoparticles on the Instability of Nanofluid (Al2O3 + H2O) Saturated Porous Medium with Internal Heating

In this article the authors investigate the effect of three different types of magnetic-field modulation namely triangular-wave form, sine-wave form, and square-wave form on the instability of nanofluid (Al2O3 + H2O) saturated porous medium with internal heating. Linear stability analysis is done analytically using the normal mode approach, whereas nonlinear stability analysis is done by using the truncated Fourier series method. We obtained that the internal heating parameter destabilizes the system, whereas Darcy number and magnetic Chandrasekhar number stabilizes the system. The impact of three different shapes (Sphere/Bricks/Cylinder) of nanoparticles over instability is also analyzed, and it is found that the system is most stable for sphericalshaped nanoparticles while least stable for cylindrical-shaped nanoparticles. Mass/heat transfer in the system is analyzed by two different approaches, Mathematica NDSolve and Runge-Kutta-Fehlberg method (RKF-45), and it is found that the rate of mass/heat transfer is exactly the same in both cases. The internal heating and magnetic Chandrasekhar number play a crucial role in the heat/mass transfer in the system. Moreover, it is also noticed that heat and mass transfer start earliest in the case of triangle-waveforms as compared to other types of magnetic-field modulations.

The thermal radiation effect on Casson nanofluids EG-GO and EG-CNTs models using Caputo fractional order derivative with shape effects: Via analytical investigations

This research examines the analytical investigations for radiating Casson nanofluid models with unsteady convecting flow, which are valued by the order of Caputo fractional derivative (CFD). Ethylene glycol (EG) is used as a base fluid, and graphene oxide (GO) and carbon nanotubes (CNTs) are used as nanoparticles. The problem’s leading PDEs are nondimensionalized by applying the proper nondimensional variables. The solutions to the dimensionless governing equations are found by using the Fourier sine and Laplace transformation techniques together. For an enormous study of the problem, graphical illustrations and tables are developed by using MATLAB software programming with the help of Euler inversion. We examine the impact on the fractional heat and momentum equation of the [Formula: see text], Gr, Pr, [Formula: see text], R, [Formula: see text], oscillations. Using the properties of the fluid, important discoveries were made that indicated a number of elements for a number of flow parameters as well as fractional parameters. The thermal profiles are increased for [Formula: see text] decreased for [Formula: see text] at [Formula: see text] and [Formula: see text]. The velocity profiles are increased for R and Gr decreased for [Formula: see text] and [Formula: see text] at [Formula: see text] and 1.4. Different shapes of nanoparticles are performed for ordinary fractional parameters, which are increased for temperature as well as velocity.

Shape Impacts of Nanoparticles on Mixed Convective Flow Over a Vertical Cylinder with Thermal Dispersion

The main aim of the present article to study the thermal dispersion, thermal radiation and magnetic effects on the mixed convective flow of nanoparticles and its shape effects on vertical cylinder. The governing equations are solved and numerically solved by using shooting technique. The thermal dispersion and thermal radiation on velocity, temperaure and heat transfer for different shapes of nanoparticles are depicted graphically.

A Free Convective Two-Phase Flow of Optically Thick Radiative Ternary Hybrid Nanofluid in an Inclined Symmetrical Channel through a Porous Medium

In the present article, we investigate the free convective flow of a ternary hybrid nanofluid in a two-phase inclined channel saturated with a porous medium. The flow has been propelled using the pressure gradient, thermal radiation, and buoyancy force. The flow model’s governing equations are resolved using the regular perturbation approach. The governing equations are solved with the help of the regular perturbation method. Polyethylene glycol and water (at a ratio of 50%:50%) fill up Region I, while a ternary hybrid nanofluid based on zirconium dioxide, magnesium oxide, and carbon nanotubes occupies Region II. The ternary hybrid nanofluids are defined with a mixture model in which three different shapes of nanoparticles, namely spherical, platelet, and cylindrical, are incorporated. The consequences of the most significant variables have been examined using both visual and tabular data. The main finding of this work is that utilising a ternary hybrid nanofluid at the plate y = 1 increases the rate of heat transfers by 753%, demonstrating the potential thermal efficiency. The overall heat and volume flow rates are amplified by buoyant forces and viscous dissipations and dampened by the thermal radiation parameter. The optimum enhancement of temperature is achieved by the influence of buoyancy forces. A ternary nanofluid region experiences the maximum temperature increase compared to a clear fluid region. To ensure the study’s efficiency, we validated it with prior studies.

Unsteady mixed convective flow of hybrid nanofluid past a rotating sphere with heat generation/absorption: an impact of shape factor

Purpose This study aims to examine the flow of unsteady mixed convective hybrid nanofluid over a rotating sphere with heat generation/absorption. The hybrid nanofluid contains different shapes of nanoparticles (copper [Cu] and aluminium oxide [Al2O3]) in the base fluid (water [H2O]). The influence of different shapes (sphere, brick, cylinder, platelets and blades) of nanoparticle in water-based hybrid nanofluid is also investigated. Design/methodology/approach To analyse the nanomaterial, the flow model is established, and in doing so, the Prandtl’s boundary layer theory is incorporated into the present model. The bvp4c approach, i.e. finite difference method, is used to find the numerical solution of differential equations that is controlling the fluid flow. The effect of relevant flow parameters on nanofluid temperature and velocity profile is demonstrated in detailed explanations using graphs and bar charts, whereas numerical results for Nusselt number and the skin’s coefficient for various form parameters are presented in tabular form. Findings The rate of heat transfer is least for spherical-shaped nanoparticle because of its smoothness, symmetricity and isotropic behaviour. The rate of heat transfer is highest for blade-shaped nanoparticles as compared to other shapes (brick, cylindrical and platelet) of nanoparticles because the blade-shaped nanoparticles causes comparatively more turbulence flow in the nanofluid than other shapes of nanoparticle. Heat generation affects the temperature distribution and, hence, the particle deposition rate. The absorption of heat extracts heat and reduce the temperature across the rotating sphere. The heat generation/absorption parameter plays an important role in establishing and maintaining the temperature around the rotating sphere. Research limitations/implications The numerical study is valid with the exception of the fluctuation in density that results in the buoyancy force and the functional axisymmetric nanofluid transport has constant thermophysical characteristics. In addition, this investigation is also constrained by the assumptions that there is no viscosity dissipation, no surface slippage and no chemically activated species. The hybrid nanofluid Al2O3–Cu/H2O is an incompressible and diluted suspension. The single-phase hybrid nanofluid model is considered in which the relative velocity of water (H2O) and hybrid nanoparticles (Al2O3–Cu) is the same and they are in a state of thermal equilibrium. Practical implications Study on convective flow across a revolving sphere has its applications found in electrolysis management, polymer deposition, medication transfer, cooling of spinning machinery segments, spin-stabilized missiles and other industrial and technical applications. Originality/value The originality of the study is to investigate the effect of shape factor on the flow of electrically conducting hybrid nanofluid past a rotating sphere with heat generation/absorption and magnetic field. The results are validated and provide extremely positive balance with the recognised articles. The results of the study provide many appealing applications that merit further study of the problem.

Insight into the thermocapillary radiative flow of hybrid nanoliquid film over an infinite rotating disk with entropy generation and heat source

Research into hybrid nanofluid flow over a disk surface is growing due to numerous processes in marine or gas turbines, rotating disk reactors for biofuels generation, cooling of spinning equipment components and other industrial applications. The purpose of this research study is to examine the entropy generation for the transient thermocapillary flow of hybrid nanoliquid thin films across a disk surface with different shapes of nanoparticles. To analyze the nanomaterial, the Tiwari–Das hybrid nanofluid flow model is established, and in doing so, Prandtl’s boundary layer theory is incorporated into this model. The energy equation considers the impacts of thermal radiation, two different kinds of heat sources — namely an exponentially space-dependent heat source and a linear thermal heat source — and viscous dissipation. The nonlinear partial differential equations, which explain the flow processes, are transformed into the nondimensional ordinary differential equations (ODEs). Once the ODEs have been constructed, they are next solved using the bvp4c technique. In addition, the surface drag force and the rate of heat transfer are both evaluated as functions of the shape factor of the nanoparticles that are disseminated in the base fluid. The influence of significant parameters on the flow fields is depicted graphically, and adequate physical explanations are provided for each representation. One of the important findings of this study indicates that the largest amount of heat transfer can be accomplished at the disk surface by employing nanoparticles with blade shape, while this physical quantity is the least when nanoparticles with spherical shapes are used. The temperature profile grows as the thermal and exponential heat sources increase. Entropy generation improves with the increase in either the magnetic parameter or the Brinkman number.

MHD flow of non-Newtonian ferro nanofluid between two vertical porous walls with Cattaneo–Christov heat flux, entropy generation, and time-dependent pressure gradient

This article studies the magnetohydrodynamic flow of non-Newtonian ferro nanofluid subject to time-dependent pressure gradient between two vertical permeable walls with Cattaneo–Christov heat flux and entropy generation. In this study, blood is considered as non-Newtonian fluid (couple stress fluid). Nanoparticles’ shape factor, Joule heating, viscous dissipation, and radiative heat impacts are examined. This investigation is crucial in nanodrug delivery, pharmaceutical processes, microelectronics, biomedicines, and dynamics of physiological fluids. The flow governing partial differential equations are transformed into the system of ordinary differential equations by deploying the perturbation process and then handled with Runge–Kutta 4th-order procedure aided by the shooting approach. Hamilton–Crosser model is employed to analyze the thermal conductivity of different shapes of nanoparticles. The obtained results reveal that intensifying Eckert number leads to a higher temperature, while the reverse is true for increased thermal relaxation parameter. Heat transfer rate escalates for increasing thermal radiation. Entropy dwindles for intensifying thermal relaxation parameter.

Improved thermal conductivity of hydrodynamic third‐grade ferrofluid using nanolayer concept: A PTSC application

AbstractThe current study numerically investigates the heat diffusion in the cylindrical film flow of third‐grade ferroliquid. The nanolayer concept is used to analyze the effective thermal conductivity of ferrofluid in different shapes of nanoparticles. Ethylene glycol (EG)‐based cobalt (Co) nano‐sized particles are measured. Using hydrodynamics, Darcy‐Forchheimer, Ohmic heating, and nonlinear radiation effects, an exact model was developed and resolved through the bvp5c Matlab scheme. The computational outcomes are elucidated through pictorial and tabular results. The cylindrical‐shaped nanoparticles are reported to have more advanced heat relocation than the spherical‐shaped nanoparticles. This proved that the nanolayer formed with the cylindrical‐shaped nanoparticles' effectivity boosts the base liquid thermal conductivity. So, to enlarge the PTSC heat spread rate, suspension of Co‐cylindrical nanoparticles in base liquid with third‐grade rheological behavior is very helpful.

Thermal performance of aqueous alumina–titania hybrid nanomaterials dispersed in rotating channel

The extension of nanoliquid obtained by adding nano-powder composite or various nanoparticles in regular liquid is term as hybrid nanofluid. Hybrid nanofluids are more potential materials that significantly uplift the thermophysical feature and capacity of heat transportation instead of single nanoparticle nanoliquid. Hence, the paramount interest of this paper is to model theoretically the flow of aqueous alumina–titania hybrid nanoliquid across a rotating channel. Temperature-based viscosity is addressed. This analysis further contributes the impact of heat source and dissipation phenomena. Additionally, two different shapes of nanoparticles, namely, bricks- and needle-shaped are included. Similarity variables dimensionless the governing problem. The obtained system is solved by employing Mathematica-based NDSolve approach. The impact of various embedded variables is elucidated graphically. The presence of hybrid nanocomposite greatly affects the temperature and Nusselt number than nanoparticles. Further outcomes declared that rotation and heat source variables significantly increase the thermal field for hybrid nanophase when compared with nanophase.

A STUDY OF MIXED CONVECTIVE TERNARY HYBRID NANOFLUID FLOW OVER A STRETCHING SHEET WITH RADIATION AND TRANSPIRATION

This study explains the motion of a mixed convective ternary hybrid nanofluid flow with radiation and transpiration. Ternary hybrid nanofluid is the colloidal mixture of three district types of particles, namely, Al<sub>2</sub>O<sub>3</sub>, single-wall CNT, and graphene. The ordinary differential equations (ODEs) of the equation is yielded by converting partial differential equations (PDEs) with the help of suitable variables for analyzing the spherical, cylindrical, and platelet nanoparticles. Then the analytical solution can be conducted by using different shapes of the nanoparticles, namely, spherical, cylindrical, and platelet, to get the solution domain. Main results on the applications of suction and results of four roots are investigated. Also by using this domain fluctuation of friction, heat and mass transfer across the flow can be analyzed with various physical parameters. Increasing knowledge of these ternary hybrid nanofluids helps to improve the heat transfer rate. This is useful in dynamics of fuel and coolant in automobiles. Furthermore, the goal and novelty of the present work mainly explains the ternary hybrid nanofluid flow with three different shapes of nanoparticles in the presence of mixed convection. The given mixed convective Navier-Stokes equations given in PDE form are converted into ODE form using suitable transformation. The analytical results are expressed in terms of Prandtl number and in terms of four roots. Finally, the impact of different shapes of nanoparticles and parameters can be discussed using a graphical scenario. The main finding is that the Dufour number is greater for more values of thermal radiation. Also, transverse and tangential velocities as well as temperature and concentration profiles are greater for more values of solution domain and Darcy number.

GisaxStudio—An Open Platform for Analysis and Simulation of GISAXS from 3D Nanoparticle Lattices

Grazing-incidence small-angle X-ray scattering (GISAXS) is a powerful method for the structural analysis of ordered arrays of nanoparticles, quantum dots, or similar objects. However, for the correct interpretation of the measured GISAXS intensity distributions, a proper data analysis, including a suitable model, is required. Here, we demonstrate a software platform, GisaxStudio, aimed at the analysis and simulation of 2D GISAXS intensity distributions from ordered lattices of different nanoparticles. It contains several models that satisfactorily describe the GISAXS from 3D lattices or crystals of nanoparticles prepared by the self-assembly processes, pre-pattering, or ion-beam interaction with the material within their tracks. It also supports different shapes of nanoparticles, including core-shell structure with the center of core possibly displaced from the center of the shell. The software is very useful for fast and accurate GISAXS data analysis.

Influence of nanoparticles on freezing inside container equipped with fins

With loading of different shapes of nanoparticles, the solidification speed can be changed which was scrutinized in current work. Although the nanoparticles dispersion can decline the heat capacity, the conduction mode can be improved with such technique and changing the styles of nano-powders can alter the strength of conduction. The velocity terms were neglected in freezing, thus, the main equations include two equations with unsteady form for scalars of solid fraction and temperature. Grid adaption with position of ice front has been considered in simulations utilizing FEM. The upper sinusoidal and inner rectangular walls maintain cold temperature and freezing starts from these regions. Adding nanomaterial can expedite the process around 15.75% (for m = 4.8) and 29.8% (for m = 8.6). Also, utilizing particles with shapes of blade form can augment the freezing rate around 16.69%. The efficacy of m on freezing process rises around 4% with elevate of concentration of nanoparticles.

Study of Effect of Different Shapes of Nanoparticles in Three-Layer Model for Blood Flow in Arterioles

Arterioles are pivotal console of hemodynamics as they are significant contributors to pressure. Under various physiological conditions like administration of a drug, arterioles ascertain divergent mechanical forces. The current communication discusses the effect of different shapes of copper nanoparticles inoculated as nano drugs in arterioles. The blood is assumed to be a non-Newtonian fluid and is delineated as nanofluids. The three-layer model is used for modeling the blood flow as it aptly describes the flow of blood in narrow vessels of diameter less than 100 μm. The Hamilton-Crosser model is implemented to describe the thermal conductivity of nanofluid as this model holds in accordance with experimental as well as theoretical results. The expressions are also obtained for density, thermal expansion and viscosity of the considered nanofluid. The equations are solved analytically and graphs have been plotted using MATLAB. The relative consequence of various shapes of nanoparticles like platelets, blades, cylinders and bricks is observed in temperature, velocity and flow rate. It has been investigated through the graphs that brick-shaped nanoparticles have shown a maximum rise in temperature, velocity and flow rate. And reverse results are observed for blade-shaped nanoparticles. The effect of volume fraction, heat source parameter and Grashof number have also been inspected. The considered analysis shows that a suitable shape of nanoparticle can be used to develop the nano drug according to biomedical needs.

Convective flow of a Williamson hybrid nanofluid in a porous medium through a cone and wedge with the effect of the shape of nanoparticles

AbstractThe performance of nanofluid in the heat transport phenomena showed satisfactory results, which have been considered by scientists and researchers. The dispersion of two nanoparticles to form a mixture which named as hybrid nanofluid. It has been proved experimentally that hybrid nanofluid has good thermal performance compared to unitary nanofluid. The present study inspected the convective flow of a Williamson hybrid nanofluid through a cone and wedge in a porous medium of different shapes of nanoparticles (cylindrical‐, spherical‐, blades‐, platelets‐, bricks‐) under the influence of a magnetic field. The partial differential equations were converted to an ordinary differential equation and the resulting equations were solved using the bvp4c MATLAB code. The effect of some important physical parameters on both the velocity and temperature profile was graphically plotted and the effect of the shape and size of nanoparticles was discussed, the numerical values of the friction coefficient and Nusselt number were obtained. As observed, the friction factor of Ag–TiO2–H2O hybrid nanofluid was more than that of TiO2–H2O nanofluid. A significant enhancement in bulk temperature is seen for the Ag–TiO2 hybrid and nanofluid formed by blade‐shaped nanoparticles followed by cylindrical, platelet, brick, and spherical nanoparticles. In addition, for a 5% volume fraction of using blade nanoparticles shape givean increase in skin friction factor about 4.8% compared tobrick hybrid nanoparticles. A comparative study of different forms for Ag‐TiO2was presented graphically.

Evaluation of entropy generation characteristics of boehmite-alumina nanofluid with different shapes of nanoparticles in a helical heat sink

Entropy generation characteristics of different nanoparticle shapes are explored considering a nanofluid-cooled helical heat sink system for both laminar and turbulent flow regimes. For each flow regime, four different Reynolds numbers are considered, ranging from Re=500 to 20,000. Five different particle shapes (spherical, bricks, blades, cylindrical and platelets) are included for this comparative study, and their thermal, frictional, and total entropy generation characteristics are evaluated for four different nanoparticle volume concentrations (ϕ=0.5, 1.0, 1.5, and 2.0%), and the outcomes are compared to the base fluid case (ϕ=0%) as well as a comparison is considered among the investigated nanoparticles. Obtained results revealed that in the turbulent flow regime, the thermal entropy generation tends to decrease with increasing particle volume fraction, and the highest decrements are obtained for platelet shape (43%). The frictional entropy generation shows an opposite trend, and the platelet nanoparticles yield the highest increment, around 6.32 folds in both laminar and turbulent flow. In both flow regimes, the spherical particles have the smallest impact on the entropy generation among the examined ones. In addition to that, increment in Re results in a decrement in the thermal entropy generation, while it causes a remarkable increase in the frictional entropy generation.

Scientific investigation of a fractional model based on hybrid nanofluids with heat generation and porous medium: applications in the drilling process

This article investigates graphite-aluminum oxide hybrid nanoparticles in water-base fluid with the addition of heat generation in the presence of a porous medium. The problem is formulated in terms of momentum and energy equations with sufficient initial and boundary conditions. The solution is investigated by using the Laplace transform method. It is observed that the velocity of the drilling fluid is controlled by adding hybrid nanoparticles as compared to simple nanofluids. In a similar way, the temperature of the fluid is reduced. Also, the heat transfer rate is boosted up to 37.40741% by using hybrid nanofluid compared to regular nanofluid. Moreover, the heat transfer rate was increased up to 11.149% by using different shapes of nanoparticles in the base fluid water. It is also observed that by using hybrid nanofluid skin fraction is boosted up at y = 0 and boosted down at y = 1.

THE EFFECT OF AL2O3 NANOPARTICLES SPHERICITY ON HEAT TRANSFER BY FREE CONVECTION IN AN ANNULAR METAL-BASED POROUS SPACE BETWEEN VERTICAL CYLINDERS SUBMITTED TO A DISCRETE HEAT FLUX

In the present study, the transferred thermal heat by the phenomenon of free convection flow in an annular metal-base porous space inside two vertical concentric cylinders saturated by a (Al2O3-water) nanofluid with different shapes of nanoparticles (NPs) has been numerically investigated. The finite difference method is used to solve the governing system of equations. The outer cylinder is kept at constant temperature, and the discrete heat flux and the unheated adiabatic sections are placed on the inner cylinder. The base walls are insulated and impermeable. The obtained results of the numerical simulation are presented to exhibit the consequences of various parameters, such as the Rayleigh number (RaTh), Darcy number (Da), porosity (ε), solid NPs volume fraction (φ), and the shape of NPs as well as the conductivity ratio of porous media (λ). It is observed that the transferred thermal flux increases as the conductivity ratio of porous media increases. The results obtained also show an improvement of the rate of heat transfer with the increase in Darcy number, Rayleigh number, and NPs volume fraction. Furthermore, a significant improvement in the overall heat transfer has been found with oblate and prolate alumina (Al2O3) spheroid NPs.