Ammar Alsabery

• PhD
• National University of Malaysia

This work considered the natural convection in a 3D trapezoidal cavity filled with Al2O3-water nanofluid. The left and right vertical cavity walls were maintained at different hot and cold temperatures. We compared the results of the considered tests to those of pure water and evaluated the effect of the solid volume fraction at two different value...

This chapter gives a brief view about the nanofiller applications in energy industry and also presents a detailed survey about the most published papers in this field. The most important conclusions, which are deduced from the previous works, are reviewed and summarized carefully in Tables 1, 2, 3, 4 and 5.

This work presents an adaptive model predictive control (MPC) strategy to suppress the vibration in a laminated composite beam. The control method incorporates a system identification algorithm to estimate the system parameters online, which provides a precise simulation of system dynamics. A fixed-free cantilever composite beam equipped with piezo...

In this study, minimizing entropy generation in a horizontal pipe is numerically investigated through two passive techniques: in the first mode, the helical wire inserts in the pipe were placed at three various ratios of pitch ratio. The second mode is adding cupric oxide nanoparticles at various volume concentrations. Experiments were conducted fo...

The integration of cavities designed with distinct specifications enhances the convective heat transfer, leads to improved performance of engineering systems. The current research focuses on numerical investigation of mixed convection within the cavity, which features a partially heated wall and a rotating cylinder. The cavity is filled with hybrid...

The solar air heater has a low heat transfer coefficient due to the development of a laminar sublayer inside the channel of the solar collector. Adding artificial roughness or ribs to the surface of the wall of the absorber plate is an effective and promising method to increase heat transfer by interrupting the laminar sublayer. In this study, a tr...

This review peruses a comprehensive implementation of inner bodies involved in cavities filled with regular and nanofluids for both natural and mixed convection modes. The topic of nanofluid acquired its importance in the heat transfer field about two decades ago. Many experimental studies have been conducted to establish accurate correlations betw...

Two dimensional wavy walls rectangular cavity with inclined magnetohydrodynamic has been examined in mixed convection configurations. Triple fins arranged in the upwards ladder were filled within alumina nanoliquid in the cavity. Vertical sinusoidal walls were heated, and the other side was kept cold while both horizontal walls were kept adiabatic....

Newly, energy storage systems and harvesting energy equipment are modern and important topics in engineering problems, but they still face the efficiency problem. Using the advantages of micro-scale flow and metal porous materials can be applied to improve the performance of these systems. So, the present investigation provides a numerical study on...

Citation: Alsabery, A.I.; Alshukri, M.J.; Jabbar, N.A.; Eidan, A.A.; Hashim, I. Entropy Generation and Mixed Convection of a Nanofluid in a 3D Wave Tank with Rotating Inner Cylinder. Energies 2023, 16, 244. Abstract: The generation of entropy and mixed convection in a nanofluid-filled 3D wavy tank containing a rotating cylinder is investigated. The...

The problem studied in this paper consists of forced fluid flow inside a horizontal channel involving two semi-cylinders and two flexible baffles attached alternatively to the lower and upper walls of the channel. A phase change material fills the semi-cylinders, which are being heated by constant temperature. Cold air is forced through the channel...

In thermofluid systems, the lid-driven square chamber plays an imperative role in analyzing thermodynamics’ first and second laws in limited volume cases executed by sheer effects with a prominent role in many industrial applications including electronic cooling, heat exchangers, microfluidic components, solar collectors, and renewable energies. Furth...

Convective heat transfer of laminar forced convection in a wavy channel is studied in this paper. Numerical simulations of the 3D steady flow of Newtonian fluid and heat transfer characteristics are obtained by the finite element method. The effects of the Reynolds number (10 ≤ Re ≤ 1000), number of oscillations (0 ≤ N ≤ 5) and amplitude of the wal...

Absract All studies regarding the double passages channel use a rigid baffle to separate the two passages. In the current paper, we use a flexible separator and inspected its role in enhancing the performance of the heat transfer. The cold fluid is forced upward in the channel which is heated isothermally by different temperatures on its walls. A f...

Hyperthermia is one of the non-invasive therapy of an Abdominal Aortic Aneurysm (AAA), which is achieved by applying a heat source upon the AAA without surgical operation. This research paper considers laminar flow and heat transfer in a heated abdominal aortic aneurysm using an isothermal boundary condition. Heat is added to explicate the thermal...

In this study, heat transfer enhancement by natural convection Al 2 O 3 /water mono and Al 2 O 3-SiO 2 /water hybrid nanofluid in an enclosure cavity have been performed utilizing the finite element method. For numerical computations , the homogeneous nanofluid approach was considered. The cavity was heated from the left vertical wall and cooled fr...

The control of thermophysical, fluid flow, and structure of nanofluids using a magnetic field has attracted the focus of many recent researchers in the field. Despite the broad range and application of the magnetic nanofluids, there is no scientometric or thematic analysis revealing the number and distribution of the publications and citations in t...

Mixed convection in a rectangular double lid-driven cavity filled with hybrid nanofluid (Al2O3–Cu–water) subjected to insulated sidewalls and sinusoidal temperature on horizontal walls is numerically investigated. Using the SIMPLE algorithm for pressure, velocity coupling, the momentum, mass conservation, and energy equations are numerically solved...

The energy transport enhancement is a topical problem for many engineering applications. One of the possible solutions to this problem is an improvement of the heat transfer surface. The present investigation is devoted to numerical simulation regarding turbulent forced convective energy transport inside a curved channel under the isothermal heatin...

This research paper presents a detailed review about the recent advances concerned with the heat pipe-evacuated tube solar collectors. The reviewed papers covered various subjects related with this type of the collectors such as enhancement techniques, its structure designing and the methods used to modify it. Moreover, the effects of integration o...

In this study, mixed convection regarding nanofluid within the wavy lid-driven enclosure and a prominent heat source is investigated. A two-phase method is applied to the employed nanoliquid which leads to a non-homogeneous concentration field. The obtained governing equations are solved by the finite element technique. The effects of adding nanopa...

This work examines steady convection heat transfer and entropy generation in a wavy cubical container with Al2O3–water nanofluid and the solid cylinder. An isothermal embedded heater of finite width is located within the left vertical surface center of the container. All surfaces are insulated, except that the right wavy surface is kept cold, and t...

In the present work, a new type of nanofluid called the hybrid nanofluid (Al2O3-Cu-water) is used to enhance the heat transfer. The Finite-Volume-Method (FVM) along with the SIMPLE-algorithm has been utilized to study the heat-transfer and, mixed convection fluid-flow of the hybrid nanofluid (Al2O3-Cu-water), placed within the lid-driven rectangula...

Combined approach of geometrical variations to increase heat transfer surface with the application of high thermal conductive nanofluids can influence heat transfer enhancement in new thermal systems. This study numerically investigates the thermophoresis and Brownian diffusion as convective heat transfer enhancement mechanisms with two-phase Al2O3...

This work describes the natural convection and thermodynamic irreversibility of alumina-water nanofluid filled inside a layered cavity. The local thermal non-equilibrium (LTNE) approach is taken into consideration. The cavity bed is considered as a wavy hot plate of a very thin thickness, while its roof is thermally insulated. The heat is dissipate...

The two-phase flow and heat transfer of a Cu-Al2O3 water hybrid nanofluid in a wavy enclosure partially filled with a porous medium is investigated. The concentration gradient of the composite nanoparticles is modeled considering the thermophoresis and Brownian motion nanoscale forces. The porous medium is also modelled using the local thermal non-...

The flow and heat transfer fields from a nanofluid within a horizontal annulus partly saturated with a porous region are examined by the Galerkin weighted residual finite element technique scheme. The inner and the outer circular boundaries have hot and cold temperatures, respectively. Impacts of the wide ranges of the Darcy number, porosity, dimen...

The problem of transient Magnetohydrodynamic (MHD) combined convection within a wavy-heated rectangular cavity having two inner cylinders is investigated using the non-homogeneous nanofluid scheme. The lower wavy surface of the cavity is kept at a constant hot temperature (Th) while the upper flat surface is kept at a constant cold temperature (Tc)...

The entropy production and mixed convection within a trapezoidal nanofluid-filled cavity having a localised solid cylinder is numerically examined using the finite element technique. The top horizontal surface moving at a uniform velocity is kept at a cold temperature, while the bottom horizontal surface is thermally activated. The remaining surfac...

A numerical analysis of entropy generation and natural convection in a trapezoidal cavity with an internal solid cylinder filled with Al 2 O 3 – water nanofluid has been investigated using finite difference method. The bottom wall is thermally insulated while the left and right walls were cooled isothermally. Remainder of these walls are kept adiab...

Proton exchange membrane fuel cell (PEM-FC) aggregation pressure causes extensive strains in cell segments. The compression of each segment takes place through the cell modeling method. In addition, a very heterogeneous compressive load is produced because of the recurrent channel rib design of the dipole plates, so that while high strains are prov...

A numerical study is presented for the thermo-free convection inside a cavity with vertical corrugated walls consisting of a solid part of fixed thickness, a part of porous media filled with a nanofluid, and a third part filled with a nanofluid. Alumina nanoparticle water-based nanofluid is used as a working fluid. The cavity’s wavy vertical surfac...

The appearance of a heat source at the bottom of a cavity against the cold part at the top wavy surface is examined in this work. The heat transportation, velocity of the fluid, and the temperature behaviour toward the mixed convection of nanofluids are obtained from the simulation of the Galerkin finite element technique and the Navier-Stokes equa...

The passive feature of natural convection encourages continuous investigation on this field. This research work studies the natural convection inside a cavity of wavy vertical surfaces, including a heat source block standing on the base of cavity. The employed liquid is a hybrid water–Cu–Al2O3 nanofluid. The vertical wavy surfaces are fixed at low...

Development of modern heat exchangers or solar collectors is related to the analysis of working fluid flow and heat transfer within different channels. The energy transport enhancement can be reached by including nanofluids as working media and irregular channels to intensify the heat removal. The present research is devoted to computational analys...

In this study, the mixed convection heat transfer in a mechanical ball bearing filled with nano-lubricants were investigated theoretically. In our case, the bearing including eight balls revolving in counter clockwise while the inner shaft rotates in clockwise direction and the inner and outer walls of bearing were kept at constant hot and cold tem...

The understanding of mixed convection heat transfer in cavity is crucial for studying the energy consumption and efficiency in many engineering devices. In the present work, the hybrid nanofluid (Al 2 O 3-Cu-Water) is employed to increase the heat transfer rate in a double lid-driven rectangular cavity. The bottom movable horizontal wall is kept at...

Natural convection in a cubical porous container has been controlled by allowing the bottom wall to be of wavy shape and by inserting a conductive square cylinder inside of it. This control process has been investigated transiently in this paper using an alumina-water nanofluid by implementing a numerical method based on the Galerkin weighted resid...

Nanofluids as a combination of base fluid and a low concentration of nano-sizedparticles of metal or metal oxides are used in different fields of human activity, includingengineering devices in power and chemical engineering, medicine, electronics, and others.The main reason for such huge variety of nanofluid applications is the possibility, fromon...

This study investigates thermal natural convective heat transfer in a nanofluid filled-non-Darcian porous and wavy-walled domain under the local thermal non-equilibrium condition. The considered cavity has corrugated and cold vertical walls and insulated horizontal walls except the heated part positioned at the bottom wall. The transport equations...

A numerical attempt of the two-phase (non-homogeneous) nanofluid approach towards the convection heat transfer within a 3D wavy direct absorber solar collector is reported. The solar collector is permeated by a water-Al2O3 nanofluid and contains a wavy glass top surface that is exposed to the ambient atmosphere and a flat steel bottom surface. The...

Introduction: Mixed convection flow and heat transfer within various cavities including lid-driven walls has many engineering applications. Investigation of such a problem is important in enhancing the performance of the cooling of electric, electronic and nuclear devices and controlling the fluid flow and heat exchange of the solar thermal operat...

This paper investigates the natural convection inside a partially layered porous cavity with a heated wavy solid wall; the geometry is encountered in compact heat exchangers. Alumina nanoparticles are included in the water to enhance the heat exchange process. The incidental entropy generation is also studied to evaluate the thermodynamic irreversi...

Enclosure with two sides' cold flows has been considered as storage unit to investigate solidification of water. To reach greater the rate of phase changing, nanomaterial were dispersed and different shapes of nano powder were investigated. Adaptive grid with automatic time step was employed by means of finite element method. Findings were illustra...

Energy demand makes a noteworthy concern in these days. In engineering fields, heat exchangers were utilized for cooling purpose and to improve the efficiency, tapes with various configurations can be installed. Utilizing multi helical tape (MHT) is main purpose of current context. In current turbulent simulation, transportation of nanomaterial wit...

The free convection flow through a flexible baffle in an L-shaped enclosure has been numerically analyzed. The governing equations are introduced in an Arbitrary Lagrangian–Eulerian moving mesh frame. The full governing equations respect to boundary conditions were solved numerically using FEM. A grid-independent test was performed to ensure the ac...

The mixed convection two-phase flow and heat transfer of nanofluids were addressed within a wavy wall enclosure containing a solid rotating cylinder. The annulus area between the cylinder and the enclosure was filled with water-alumina nanofluid. Buongiorno’s model was applied to assess the local distribution of nanoparticles in the host fluid. The...

The current problem is performed to analyze the heatline visualization of the mixed convection mechanism and heat transfer in a double lid-driven square cavity having a heated wavy bottom surface. The moving vertical surfaces are under adiabatic conditions, and the top surface is at a cold temperature. The finite element method is employed to deter...

The present investigation addressed the entropy generation, fluid flow, and heat transfer regarding Cu-Al 2 O 3 -water hybrid nanofluids into a complex shape enclosure containing a hot-half partition were addressed. The sidewalls of the enclosure are made of wavy walls including cold isothermal temperature while the upper and lower surfaces remain...

Control of energy transport and convective liquid circulation is a challenge in various engineering devices. Solution to this major problem can be obtained by different techniques such as magnetic field impact, irregular shape of the walls, internal solid obstacles, nanoliquids, moving walls and so on. The current study is devoted to a numerical an...

The current study investigates the 2D entropy production and the mixed convection inside a wavy-walled chamber containing a rotating cylinder and a heat source. The heat source of finite-length h is placed in the middle of the left vertical surface in which its temperature is fixed at T h . The temperature of the right vertical surface, however, is...

A numerical investigation is accomplished on the natural convection flow and heat transfer in a horizontal concentric annulus in the presence of cylindrical solid wall and Carreau non-Newtonian blood model. The inner circular surface of the cavity is heated to a constant temperature and the outer circular surface is cooled. The boundaries of the an...

The focus of the current investigation is on insertion of complex-shaped device for inducing swirl intensity. H2O-based copper oxide mixture was assumed as testing fluid with considering empirical formulation for estimation of properties. Different contours of outputs were extracted via FVM. Insertion of helical device results in repeated countercl...

Steady laminar natural convection and heat transfer inside a tilted 3D wavy cavity filled by water-Al 2 O 3 nanofluid does examined numerically by applying the finite element technique. An isothermal curved heater is located at the right surface of the chamber while the left surface remains in a steady cold temperature. The top and bottom horizonta...

Magento-ferrofluid mixed convection flow inside a lid-driven square cavity with partial slip is investigated numerically using the finite volume method. The vertical walls of the enclosure are heated partially by a constant temperature, while the horizontal moving walls are kept adiabatic.The square enclosure is filled with a mixture of kerosene-co...

A numerical study is carried out on mixed convection and entropy generation of Al2O3/water nanofluid due to a rotating cylinder inside a square cavity. The numerical computations are performed taking the non-homogenous model of Buongiorno into consideration. The inner moving rotating circular cylinder is maintained at a constant hot temperature Th...

Transient natural convection of an alumina-water nanofluid saturated in non-Darcy porous media is investigated in this paper. The domain of the nanofluid is an annulus composed from a square cavity confining a solid conductive body. The nanoparticles are assumed to be slipping in the base fluid according to Buongiorno model. The Brinkman-Forchheime...

The current numerical study looked into the magneto-hydrodynamics mixed convection of nanofluid in a lid-driven square cavity subjected to heating by a triangular thick wall. The nanofluid heat transfer was modelled by using a two-phase Buongiorno model, whereas obtaining a numerical solution for the governing equations was described using the fini...

Purpose The purpose of this paper is to study the effects of finite wall thickness on the natural convection and entropy generation in a square cavity filled with Al 2 O 3 –water nanofluid in the presence of bottom heat source. Design/methodology/approach The moving isothermal heater was placed on the bottom solid wall. The vertical walls (left an...

The current work concentrates on the transient entropy generation and mixed convection due to a rotating hot inner cylinder within a square cavity having a flexible side wall by using the finite element method and arbitrary Lagrangian-Eulerian formulation. Effects of various relevant parameters like Rayleigh number (104⩽Ra⩽107), angular rotational...

Purpose This paper aims to investigate the fluid structure interaction analysis of conjugate natural convection in a square containing internal solid cylinder and flexible right wall. Design/methodology/approach The right wall of the cavity is flexible, which can be deformed due to the interaction with the natural convection flow in the cavity. Th...

This work investigates the problem of entropy generation and natural convection in a wavy-wall cavity filled with a nanofluid and containing solid inner cylinder using the Galerkin finite-element method. An isothermal heat source fixed at the left vertical wall of the cavity and the horizontal walls have taken adiabatic, while the right wavy wall c...

A numerical study is made on the entropy generation and magnetohydrodynamics natural convection of \(\hbox {Al}_{2}\hbox {O}_3\)-water non-homogeneous nanofluid inside a square enclosure equipped with a heated trapezoidal body. The Galerkin weighted residual finite element method is applied to solve the dimensionless governing equations within the...

In the current work, the impacts of local thermal non-equilibrium model and Al 2 O 3 -water nanofluid on natural convection heat transfer in a porous cavity consisting of a bottom heated wavy wall and an inner solid cylinder are investigated. The Galerkin weighted residual finite element method is utilized to simulate the dimensionless governing eq...

Purpose The aim of this study is to investigate the effects of two-phase nanofluid model on mixed convection in a double lid-driven square cavity in the presence of a magnetic field. The authors believe that this work is a good contribution for improving the thermal performance and the heat transfer enhancement in some engineering instruments. Des...

Heat transfer enhancement in engineering systems can be reached using nanofluids. Very often, technical devices are chambers with moving borders of a flat or a wavy shape having internal heat-conducting blocks. Therefore, the present study is devoted to study computationally the problem of time-dependent heat transfer of alumina-water nanoliquid wi...

By employing the finite element method, thermophoresis and Brownian diffusion are studied numerically relating to the natural convection in a wavy cavity that is filled with an Al2O3-water nanofluid possessing a central heat-conducting solid block that is influenced by the local heater located on the bottom wall. An isothermal condition is establis...

The current work examines the effects of a bottom trapezoidal solid body and a magnetic field on mixed convection in a lid-driven square cavity. The Al 2 O 3 -water nanofluid used is assumed to obey Buongiorno’s two-phase model. An isothermal heater is placed on the bottom base of the trapezoid solid body, while the cavity’s vertical walls are kept...

In this study, the conjugate natural convection in a square cavity filled with \(\hbox {Al}_2\hbox {O}_3\)–water nanofluid with an inner conducting solid block is studied numerically using nonhomogeneous Buongiorno’s two-phase model. The left wall of the cavity is partially heated and the remaining parts of the wall are adiabatic, while the right w...

In the present study, natural convection heat transfer of [Formula presented]-water nanofluid inside a square cavity with a solid circular cylinder is investigated numerically. For numerical computations, the finite element method is used by taking into consideration Buongiorno's two-phase model. Parts of the vertical surfaces of cavity are kept at...

This study investigates numerically the effect of the two-phase nanofluid model due to natural convection within a square cavity along with the existence of a conducting solid block, and a corner heater using the finite difference method (FDM). The top horizontal wall is retained at a cold temperature that is fixed as constant, while the isothermal...

Purpose The purpose of this paper is to study problem of conjugate MHD natural convection of Al 2 O 3 -water nanofluid in a square cavity with conductive inner block using Buongiorno’s two-phase model numerically. Design/methodology/approach An isothermal heater is placed on the left wall of the square cavity, while the right wall is maintained at...

This numerical study considers the mixed convection and the inherent entropy generated in Al 2 O 3 –water nanofluid filling a cavity containing a rotating conductive cylinder. The vertical walls of the cavity are wavy and are cooled isothermally. The horizontal walls are thermally insulated, except for a heat source segment located at the bottom wa...

Unsteady natural convection in a differentially heated oblique cavity with a flexible oscillating heat-conducting fin mounted on the bottom adiabatic wall is studied numerically by using the finite element method. The right inclined wall is kept at a constant low temperature, while the left one is adiabatic with a local isothermal heater, the fin i...

The aim of the present study is to analyze the entropy generation and convective heat transfer in a bottom-heated wavy porous cavity containing a solid rotating cylinder. An isothermal heater of length h is placed on the bottom wall of the cavity, while both the left and right vertical wavy walls are maintained at a constant cold temperature Tc. Th...

The present study investigates the conjugate heat transfer in a square cavity heated by a triangular solid and saturated with \(\text{Al}_2\text{O}_3\)–water nanofluid. Two-phase Buongiorno’s model is used for modeling the nanofluid heat transfer. The finite element method is used for numerical solution of the dimensionless governing equations subj...

The aim of the present study is to analyze the convective flow and heat transfer of nanofluid in an inclined cavity filled with heat generating porous medium using the local thermal non-equilibrium model. The horizontal bottom wall of the cavity is maintained at a constant higher temperature while the left and right vertical walls are maintained at...

This paper investigates a steady mixed convection in a lid-driven square cavity subjected to an inclined magnetic field and heated by corner heater with an inserted square solid block. Water–Al\(_2\)O\(_3\) nanofluid fills the cavity based on Buongiorno’s two-phase model. A corner heater is configured in the left lower corner of the cavity by maint...

The problem of steady, laminar natural convection in a discretely heated and cooled square cavity filled by an alumina/water nanofluid with a centered heat-conducting solid block under the effects of inclined uniform magnetic field, Brownian diffusion and thermophoresis is studied numerically by using the finite difference method. Isothermal heater...

The problem of entropy generation analysis and natural convection in a nanofluid square cavity with a concentric solid insert and different temperature distributions is studied numerically by the finite difference method. An isothermal heater is placed on the bottom wall while isothermal cold sources are distributed along the top and side walls of...

The present paper investigates steady conjugate mixed convection in a double lid-driven square cavity including a solid inner body. The annulus is filled with water-Al2O3 nanofluid based on Buongiorno’s two-phase model. The top horizontal wall is maintained at a constant low temperature and moves to the right while the bottom horizontal wall is mai...

The problem of conjugate natural convection of Al2O3–water nanofluid in a square cavity with concentric solid insert and isothermal corner boundaries using non-homogenous Buongiorno's two-phase model is studied numerically by the finite difference method. An isothermal heater is placed on the left bottom corner of the square cavity while the right...

The effects of nonuniform heating and a finite wall thickness on natural convection in a square porous cavity based on the local thermal nonequilibrium (LTNE) model are studied numerically using the finite difference method (FDM). The finite-thickness horizontal wall of the cavity is heated either uniformly or nonuniformly, and the vertical walls a...

Purpose This paper aims to study analytically and numerically the problem of transient natural convection heat transfer in a trapezoidal cavity with spatial side-wall temperature variation. Design/methodology/approach The governing equations subject to the initial and boundary conditions are solved numerically by the finite difference scheme consi...

This work analyses free convection flow of a nanofluid in an inclined square enclosure consisting of a porous layer and a nanofluid layer using the finite difference methodology. Sinusoidal temperature boundary conditions are imposed on the two opposing vertical walls. Nanofluids with water as base and Ag or Cu or Al2O3 or TiO2 nanoparticles are co...