Ali J. Chamkha

• Distinguished Professor and Dean of Engineering. In Charge of All Academic Affairs at the University
• Download my papers freely from http://alichamkha.net at Kuwait College of Science and Technology

The article presents a solution to a complex problem involving a transient MHD‐free convective chemically reactive flow. The flow involves a viscous incompressible electrically conducting non‐Gray optically thick fluid moving past a semi‐infinite vertical plate that has suddenly started but is temporarily accelerated. The plate has nonlinear parabo...

This study explores the application of Al2O3-ZnO-Fe3O4/Water ternary nanofluids for enhanced thermal management in engineering applications, addressing the MHD Darcy-Forchheimer problem with an emphasis on optimizing cooling processes in a 2D-wavy cavity under various moving boundary conditions. Aimed at surpassing the limitations of conventional c...

Double diffusion combined with thermo-bioconvection in porous media under two prominent effects such as gravity modulation and internal heating are considered in the present work. The impact of considering double diffusion and porous medium in the current problem is studied graphically. We deal with linear and weakly nonlinear theory of the system....

The simultaneous investigation on the parameters affecting the flow of electrically conductive fluids such as volumetric radiation, heat absorption, heat generation, and magnetic field (MF) is very vital due to its existence in various sectors of industry and engineering. The present research focuses on mathematical modeling to simulate the cooling...

This paper investigates the pressure-driven and electroosmotic flow of Bingham plastic fluid within a curved microtube in the presence of a streaming potential. Perturbation analysis is utilised to solve the governing equations and obtain approximate analytical solutions. Validation against existing literature confirms the accuracy of the approach,...

In contemporary power engineering and microelectronics, the efficiency of cooling systems is of crucial importance. To meet this requirement, specialized approaches and the use of nanofluids are employed to improve the heat dissipation of heat-generating components. This study presents a methodology based on a numerical investigation and statistica...

The current study is based on the effects of microrotational dynamics, microinertial effects, and temperature changes on electroosmotic peristalsis in a tapered microchannel. This has been addressed by an analytical study of heat transfer in the setting of electroosmotic peristaltic flow involving a micropolar fluid, specifically considering a symm...

Aggregated studies of graphene nanoparticles is important for the effective utilization of their striking thermophysical properties and extensive industrial applications. This investigation is one such computational study to explore the flow of graphene oxide nanofluids with temperature dependant viscosity between two concentric cylinders. Buongior...

This work investigates the dynamics of the hybrid nanofluidic convective heat transfer in a permeable thermal system under the influence of multifrequency heating and a magnetic field. The geometry comprises a wavy-walled cavity filled with a water-based hybrid nanoliquid (Al2O3–Cu–H2O) in a saturated porous medium. The finite volume approach is ap...

The main objective of this work is to investigate viscous dissipation with thermal radiation impact on hybrid nanofluid flow past an exponentially stretching/shrinking surface along with magnetic field, and heat source/sink, slip boundary conditions. Water (\(\hbox {H}_2\hbox {O}\)) is taken into account as a host fluid with copper (Cu) and alumina...

This analysis is framed to take care of the high heat transfer demand from various application prospects and in this context nanofluid may be in consideration because nanofluids are well-known liquids with higher heat transfer capabilities. Here, a mixed convection flow of Molybdenum disulfide-water (MoS2-H2O) nanofluid on a moving vertical plate i...

Arterioles with a curve shape are normally associated with a slow, blood flow, which led to a consequent emergence of thrombosis. In spite of the practical importance, there are not enough computational models that studied blood flow in very tiny diameters into one efficient framework. This study has addressed the dynamics of blood effects during por...

This investigation deals with the flow of Al2O3–water nanofluid in a wavy porous channel embedded in porous rocks. Fluid exchange takes place uniformly between porous rocks and the wavy channel. In this analysis, cylindrical and parallel plate wavy porous channels are considered. Consequences of Brownian motion and thermophoresis on the flow inside...

The failure to consider thermal radiation in addition to free convection heat transfer in many cases such as heat exchangers will cause an unavoidable error in the flow analysis. Due to the complexity of volumetric radiation modeling in solving various problems, it is difficult to simulate this issue, especially through computer coding. The reason...

This review paper provides a comprehensive inspection how the magnetic Prandtl number (Prandtl number influenced by a magnetic field) and the magnetic force parameter affect convective heat transfer in boundary layers. The investigation delves into the intricate interplay between these parameters and their implications for heat-transfer phenomena....

This paper was written to demonstrate the value of using nanofluids for cooling high-power transformers while also providing current techniques for business and academia. A numerical analysis of the improvement caused by the cooling of a high-voltage transformer using nanofluids has been done. A tank with a temperature source inside and a charge of...

Purpose This paper aims to study numerically the flow, heat transfer, and entropy generation of aqueous copper oxide-silver hybrid nanofluid over a down-pointing rotating vertical cone, with linear surface temperature (LST) and linear surface heat flux (LSHF), in the presence of a cross-magnetic field. In industrial applications, such as oil and ga...

This study presents a new model for effective thermal management of a channel with elastic sinusoidal obstacles and pulsating multiple nano-jet impingements. The channel was cooled by alumina Al2O3 in various forms (platelets, blades, cylinders, and bricks) and water as a basic fluid. A hybrid nanofluid (multi-wall carbon nanotube-Fe3O4) was also u...

Endeavors to improve the performance of thermal systems have always been of great noticed due to their extremely high importance in industrial and engineering applications. For this intention, in the existing simulation, several effective strategies have been evaluated to determine the amount of heat transfer and entropy formation caused by the com...

Lab-on-a-disk systems have become popular during the past two decades by accelerating the biomedical diagnostic process and chemical reactions. Mixing performance should be attended to because of its importance in lab-on-a-disk systems. This paper investigates applying a voltage to the mixing performance in a centrifugal serpentine three-dimensiona...

Purpose The entropy and thermal behavior analyses of non-Newtonian nanofluid double-diffusive natural convection inside complex domains may captivate a bunch of scholars’ attention because of the potential utilizations that they possess in modern industries, for example, heat exchangers, solar energy collectors and cooling of electronic apparatuses...

The incompressible smoothed particle hydrodynamics (ISPH) method is utilized for studying the circular rotations of three different structures, circular cylinder, rectangle and triangle centered in a circular cylinder cavity occupied by Al2O3 nanofluid. The novelty of this work is appearing in simulating the circular rotations of different solid st...

Transformer oil is used to maintain the core and winding of the transformer. The main tasks of transformer oil as an industrial oil are insulation and cooling of a transformer. In the current study, the thermophysical and thermal properties of transformer oil nanofluid with volume percentages of 0.017% and 0.56% have been experimentally investigate...

This paper explores the incorporation of aramid fibers, recognized for their high mechanical flexibility and low thermal conductivity (TC), to serve as reinforcing agents within the highly porous aerogel matrix in order to overcome their fragility and weak mechanical structure that impose limitations on their practical utility especially in piping...

The interfacial nanolayer is a tinny coating of liquid molecules convened around the immersed solid nanoparticles in the base liquid which plays a vital role to control the flow and improve the thermophysical properties of the fluid. Features are more prominent for hybrid nanomaterials. Hence, the present analysis deals with the concomitant effects...

The combined effects of diffusion-thermo and radiative absorption on free convective hydromagnetic heat-generating chemically reactive flow of Cu-water nanofluid past an instantaneously accelerated unlimited vertical plate nested in a porous medium are investigated. A comparative analysis is executed for both isothermal and ramped conditions. The s...

The research investigates brine-based metal oxide nanofluids to improve heat transfer and ice plant COP. The novelty of the study is in the use of stable nanofluids of ZnO, CuO, and Al 2 O 3 prepared using surfactants and ultra-sonication to improve the performance of an ice plant working on the vapor compression refrigeration cycle. The study foun...

The fluid flow in a non-parallel configuration exists in the electronic heat removal devices, microchannel heat sinks, and angled confusers/diffusers. The fluids in these applications are prone to flow separation and bifurcations. To deal with such type of problems, a novel idea of a converging or diverging type Riga plate channel is introduced in...

Convective heat transfer induced in open cavities is one of the main pillars that the topic of energy saving relies on. Thus, scanning and evaluation of works dealing with such a topic is of crucial importance. This article reviews and categorizes the results of researches on mixed convection in open cavity connected with a channel, and highlightin...

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...

The present study investigates the effect of different volume ratios of PCM on the melting process and energy storage in the improved thermal energy storage (TES) system using auxiliary fluid. The purpose of using the auxiliary fluid is to benefit from the density difference between the auxiliary fluid and the PCM, which improves the convection hea...

The role of natural convection NC in nanofluids is vital to the heat transfer efficiency of various thermal systems, including solar energy devices, HVAC systems, and heat exchangers. This research examines the NC of TiO2-water nanofluid in a porous wavy circular area with a ┴shaped heater under a constant magnetic field. The governed equations may...

CPU computes several complex algorithms at billions of cycles per second. It is acceptable to generate some heat while working at such great speed. In order to reduce the problem of high temperature, which slows down the performance of tasks, a new heat sink with convex-parabolic fins was designed to study the best heat dissipation methods to reach...

Because of accelerated demands of advanced technologies like power station, chemical production and microelectronics, it necessitates the need of novel type of fluids with more heat transfer capability. Due to synergistic effect, ternary composite nanofluids (TCNFs) ensure better thermophysical and Rheology properties thereby acting as better suita...

The present flow problem analyzes the impact of radiative heat and mass transfer with inclined magnetic field on thermal exchange and entropy production of two immiscible nature of electrically conducting couple stress fluid in a static porous saturated conduit. In this model, the lower and upper porous regions of the rectangular channel are occupi...

This study aims to investigate the influence of radiation, thermal conductivity and variable viscosity on natural convective flow on a semi-infinite perpendicular plate. Variable viscosity, thermal conductivity and thermal radiation are considered for the given study. The dimensional governing equations are framed with the use of the mentioned para...

A finite difference approach to the impacts of viscous dissipative nanofluid flow past a vertical cone with iso-thermal surface temperature and concentration is taken for the study here. The guiding unsteady equations were solved using the inferred finite difference technique. In this study, we looked at different nanofluids: Cu, Al2O3 and TiO2 usi...

Riga plate is known to create a crossing electric and magnetic field to generate a wall-parallel Lorentz force. The significance of Casson nanofluid flow past a Riga plate is observed in the sphere of engineering, such as polymer extrusion, food manufacturing, plastic films, oil reserves and geothermal manufacturing. Researchers are interested in t...

This article discusses a mathematical model for the electrokinetic and Darcy’s resistance of Williamson fluid in an electroosmotic pumping environment. The zeta potential at walls aids in peristaltic movement, and porous dissipation is incorporated into this modulation by the Williamson fluid’s material parameters. Through the use of Debye-Huckel a...

Purpose This study aims to investigate the impact of different heater geometries (flat, rectangular, semi-elliptical and triangular) on hybrid nanofluidic (Cu–Al 2 O 3 –H 2 O) convection in novel umbrella-shaped porous thermal systems. The system is top-cooled, and the identical heater surfaces are provided centrally at the bottom to identify the m...

In presents of a magnetic field, an enclosure filled with ferro-particle suspended nanofluid is subjected to a numerical analysis to investigate natural convective heat transfer. At the center of the enclosure is a heat conducting and generating solid body, and the enclosure is influenced by four different thermal boundary conditions. To solve the...

The principal aim of this investigation is to examine the gold and magnesium oxide hybrid nanoparticles in different physical capacities on the water-based hybrid nanofluid and elaborate on an erratic squeezing flow among both infinite plates. Melting effect and thermal radiation depict heat transfer features. Production of the Bejan number and ent...

In this article describes the effects of transfer heat and mass on free convective flow of developed fully electrically conducting with electrically Non-conducting immiscible fluids towards a perpendicular parallel passage. The resulting nonlinear governing coupled equations describes the fluid behaviour for velocity and temperature distributions a...

In the current investigation, hydromagnetic third grade pulsating nanofluid flow through a channel under the influence of Brownian motion, thermophoresis, radiative heat has been inspected. The influence of viscous dissipation, chemical reaction, and Ohmic heating is considered in the current investigation. The Buongiorno nanofluid model is impleme...

The aim of the current effort was to analyze two-dimensional unsteady squeezing Casson fluid flow among porous channels. Flow field was impressed into uniform magnetic field affecting normal through that plate axes. The interaction on flow model into chemically reacting solute was formed over this advection–diffusion equation on that temperature de...

The natural laminar and stable heat and mass convection in an enclosure defined by two horizontal confocal elliptical cylinders with normal and opposite buoyancy forces under uniform concentration and temperature has been numerically explored in this study. The physical Cartesian domain is transformed into an elliptical domain. For the numerical si...

In high-performance thermal systems, convective heat transport is a critical phenomenon for sustainable operation from an energy efficiency standpoint. This study examines the convective heat transport dynamics of a hybrid nanofluid (aluminum oxide-copper–water nanofluid) under spatially varying nonuniform temperature conditions within a porous the...

The subject of equipment cooling has always been one of the most important issues that has imbibed the attention of many researchers. In addition to this matter, the system thermal performance analysis in which the cooling process takes place is very momentous. Cooling of an electronic component in a limited space is one of the cases of investigati...

Due to the application importance of convection flows under the impact of external fields such as magnetic field for non-Newtonian nanofluids, in cases such as nuclear processes, technologies related to lubrication, production and processing of food products, the modeling of these types of currents is very important. The existing research inquires...

The numerical simulation of a shell-and-tube heat exchanger (STHE) depends on a large number of computational cells. The number of computational cells increases dramatically with increasing heat transfer surfaces in heat exchangers, such as increasing the number of tubes or using dimples as modified surfaces. Computational cost is one of the critic...

Hybrid nanofluids were popularized by heat transfer fluids into higher surface strength, dispersion and diffusion prospects related into traditional nanofluid. The novel characteristics of a single-phase hybrid nanofluid profile coincidence in studying nanoparticles mass including base fluid mass to produce solid equivalent density and addition to...

This computational study was designed to examine the effect of alumina and copper on the flow of a nanofluid based on engine oil through a Darcy–Forchheimer porous media. The flow model incorporates the generalized radiative heat and mass transport rules. The Darcy–Forchheimer terms in the momentum equation and radiation term in the energy equation...

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, visc...

This present study is intended for a CFD analysis of hydrodynamic and thermal characteristics of water-based fluid containing TiO2 or CuO nanoparticles flowing in laminar regime in a 3D uniformly heated horizontal annulus utilizing several. Four distinct models have been developed using various combinations (A, B, C and D) of the available theorica...

In industry, double-diffusive convection has various and important technical applications. These applications include electronic apparatus cooling, drying processes, fuel cells, geothermal engineering , and thermal storage. We provide an entropy-thermal based analysis of magnetized Boussinesq-free double-diffusive convection engendered by internal...

This discussion examines the combined effects of Brownian motion, radiation, Thermophorises, activation energy, suspended nanoparticles on hydromagnetic flow Williamson nanofluid produced by the melting process. In order to mathematically describe the system, a set of strongly non-linear coupled PDEs is used. A BVP4C MATLAB solver is used to resolv...

We have developed a mathematical model and obtained a numerical solution for the motion of a non-Newtonian Maxwell fluid between two disks having rotation and stretching velocity with convective boundary constraints, porous medium and thermal radiation. The present Maxwell fluid flow model with specified boundary constraints is not discussed so far...

Perhaps the most deliberated fluid problem in the field of Computational Fluid Dynamics is the lid driven cavity flow whose simple geometry is used to study the thermal behavior of many engineering applications such as cooling of electronic equipment, solar collectors, thermal storage systems, food processing, solar ponds, crystal growth, lubricati...

In this paper, the focal aims are (i) to explore the transient boundary-layer flow and heat transfer of an electrically conducting hybrid (Ag–CuO water) nanofluid along a vertical stretching surface (sheet) having non-zero slot velocity at variable temperature, and (ii) to discuss the influences of momentous parameters involved on the heat transfer...

A three-dimensional investigation of mixed convection which occurs from Al 2 O 3 -water nanofluid flow in tube of a reduced solar collector and free convection in air gap situated between cover of solar collector and its absorber was investigated. Heat transmission by conduction in absorber and cover as well as thermal losses to exterior expressed...

This article elucidates the impact of activation energy on magnetohydrodynamic (MHD) stagnation point nanofluid flow over a slippery surface in a porous regime with thermophoretic and Brownian diffusions. Negative activation energy is scarce in practice, but the impact of negative activation energy could not be neglected as it is noticed in chemica...

Finding a low-cost method to improve the heat transfer rate in thermal energy storage (TES) is essential in the modern world. In the current research, the comparison of inclined systems, which are among the inexpensive methods, with the new combined system employing the auxiliary fluid of water is discussed. Oleic acid is selected as an unsolvable...

This paper provides an analysis of the numerical performance of a hybrid computational fluid dynamics (CFD) solver for 3D natural convection. We propose to use the lattice Boltzmann equations with the two-relaxation time approximation for the fluid flow, whereas thermodynamics is described by the macroscopic energy equation with the finite differen...

The importance of bioconvection into the application of nanoparticles has had a significant impact on fundamental technological and industrial functions in recent years. These discussions are being carried forward by the bioconvection appearance on that flow by attracting nanoparticles into additional features on thermal radiation and activation en...

A novel mathematical model for improving heat transfer using tri hybrid nanofluids is described in this paper. This study investigates the slip flow and radiative heat transfer over a moving sheet with polymer-based tri hybrid nanofluid. Under the imposed assumptions, equations governing the flow will be modeled. For nonlinear partial differential...

The thermal radiation and convective condition principles were working on specific functions like gas turbines, electrical fuel, renewable energy, projectiles, nuclear power plants, aerospace engineering, and thermal transportation. Considering the aforementioned functions, the present analysis inspected the stagnation point hybrid nanofluids movem...

In this venture, the challenge to study the mathematical model and its approximate solution for boundary layer thermosolutal Marangoni convection on a permeable flat surface with thermophoretic velocity and aligned magnetic field has been undertaken. Using a special type of transformation, governing PDEs are converted into ODEs. A semi-analytical m...