Ahmed Kadhim Hussein

University of Babylon · Department of Mechanical Engineering

This communication studies the importance of varying the radius Dp of Copper nanoparticles for microgravity-modulated mixed convection in micropolar nanofluid flux under an inclined surface subject magnetic field and heat source. In the current era, extremely pervasive modernized technical implementations have drawn attention to free convection gov...

Since the behavior of a complex dynamic system for a large oil field in Iraq is significantly influenced by many nonlinearities, its dependent parameters exhibit non-stationary with a very high delay time. Developing white-box modelling approaches for such dynamic oil well production cannot handle these large data sets with all dependent dimensions...

A numerical investigation of a phase change material (PCM) energy storage tank working with carbon nanotube (CNT)–water nanofluid is performed. The study was conducted under actual climatic conditions of the Ha’il region (Saudi Arabia). Two configurations related to the absence or presence of conductive baffles are studied. The tank is filled by en...

The rising air bubbles in a liquid due to gravity has been researched for many years and remain a fascinating subject today. The 2-D Volume of Fluid (VOF) method and the CFD technique were employed for simulating. The dynamic meshing technique is applied to simulate the hydrodynamics of rising air bubbles in a liquid water column via the User D...

Re-entry Apollo model AS-202 became a popular research area in the aerospace industries recognized the importance of the field for various interests' applications owing to its capability to resist the high heating loads through the re�entry stage. This work employs Computational Fluid Dynamics (CFD) to analyse the heat transfer and thermal stresses...

The time-independent performance of a micropolar nanofluid under the influence of magneto hydrodynamics and the existence of a porous medium on a stretching sheet has been investigated. Nano-sized particles were incorporated in the base fluid because of their properties such as their extraordinary heat-enhancing ability, which plays a very importan...

The current work focused on the study of the laminar and steady free convection of Aluminum Oxide / Water nanofluid inside cavities. Two different cavities have the same volume but different overall surface area and count of walls are studied. These cavities are heated differentially on the vertical square side walls which of identical area and dim...

The experimental study of the results of reflective aluminum foils, metal sheets, and phosphate granules on the productivity and efficiency of hemispherical solar stills was given throughout this work under the solar conditions of the city of El-Oued (Algeria). Solar stills were designed, manufactured, and tested in August 2020. A standard hemisphe...

This research is to incorporate three efficient ways that will increase the performance of baffled heat exchangers. The 1 st technique is represented by baffle perforating to create pores through which secondary streams pass in order to reduce main stream pressure on the flow areas. A 2 nd technique represented in redesigning the baffle structure b...

In this research, a single slope solar distiller was fabricated and tested under the climate of Al- Hilla city, Iraq, with a tilt angle of 32.5° according to its latitude. The experimental tests were done in November 2021. Two types of distillers were examined, the first one was a classical type, while the other one was modified by adding twenty-fi...

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...

Convection and conduction in a fluid flow and a rigid body in contact with each other often occur in engineering situations, resulting in unsteady conjugate heat transfer (CHT). Although the analytical solutions to the separate conduction and convection issues are surprisingly straightforward, the combined conjugate heat transfer problem is substan...

Purpose The purpose of this study is to address a problem in cooling of an electronic package where the dissipating fins transfer the extra heat energy from the heat source (i.e. electronic devices) to the heat sink (i.e. environment). To this end, the convective heat transfer of nanofluid flow over dissipating fins is simulated using a numerical a...

For life to exist on earth, there must be water. Freshwater resources are in short supply due to industrialization and the world’s rapid population expansion. Growing water shortage argues that using passive solar stills is the best and most practical solution in the world’s arid and semi-arid regions. For applications in distant or rural coasta...

Fresh water is scarce, making it a worldwide issue. In order to address global freshwater demand, a filtration technique is needed. Solar distillation (SD) that purifies brackish and subterranean water has been proven to be a promising green technology. It produces distilled water which can be used as potable water for drinking and other purposes....

In this article, we study the novel features of morphological effects for hybrid nanofluid flow subject to expanding/contracting geometry. The nanoparticles are incorporated due to their extraordinary thermal conductivity and innovative work for hybrid nanofluids, which are assembled of aluminum oxides, Al2O3 metallic oxides, and metallic copper Cu...

The buoyancy-driven flow in a crescent cavity is numerically analyzed by employing the finite volume method for the first time. The enclosure was filled with an incompressible fluid, whose thermal properties are given by Pr. The enclosure's left and right arcs have different temperatures. Two cases are adopted in the present work; in the first case...

The current study numerically analyzes the heat transfer enhancement and laminar fluid flow characteristics of four flat tubes with varying attack front airflow. The heat transfer characteristics of flat tubes are investigated in terms of Reynolds number, heat fluxes, and inclination angle. Four Reynolds numbers are studied (100, 200, 300, and 40...

The mathematical modeling of the activation energy and binary chemical reaction system with six distinct types of nanoparticles, along with the magnetohydrodynamic effect, is studied in this paper. Different types of hybrid nanofluids flowing over porous surfaces with heat and mass transfer aspects are examined here. The empirical relations for nan...

This up-to-date and comprehensive literature study provides a rich overview of recent developments in several solar still types. This review examines a large number of theoretical, experimental, and computational studies connected to the single-slope, double-slope, solar still with a condenser, hybrid, and other limited types of solar stills. To ma...

This article addresses the dynamic of three-dimensional rotating flow of Maxwell nanofluid across a linearly stretched sheet subject to a water-based fluid containing copper nanoparticles. Nanoparticles are used due to their fascinating features, such as exceptional thermal conductivity, which is crucial in modern nanotechnology and electronics. Th...

In this study, the significance of the Coriolis force on the dynamics of Carreau–-Yasuda flow toward a continuously stretched surface subject to the Darcy–Forchheimer law is investigated. The nanoparticles are incorporated due to their unusual characteristics (e.g., extraordinary thermal conductivity), which are significant in heat exchangers and a...

People spend most of their time indoors. The high temperature in summer led to increasing energy consumption to cover the need for air conditioning. A new system should be studied instead of the traditional air conditioning system to reduce the energy consumed. This study aims to investigate the possibility of using a chilled ceiling with a displac...

The double-diffusive convection of two rotating rods inside an infinite-shaped saturated porous cavity filled by a suspension of nano-encapsulated phase change material was investigated numerically using the (ISPH) method. The cavity includes two rotating rods, (NEPCM) particles, and porous media. The inner left and right rods are located inside th...

This numerical investigation effectively establishes a unique computing exploration for steady magnetohydrodynamic convective streams of tangent hyperbolic nanofluid traveling across a nonlinearly elongating elastic surface with a variable thickness. In addition, the importance of an externally imposed magnetic field of tangent hyperbolic nanofluid...

Many strategies have been attempted for accomplishing the needed changes in the heat transfer rate in closed cavities in recent years. Some strategies used include the addition of flexible or hard partitions to the cavities (to split them into various pieces), thickening the borders, providing fins to the cavities, or altering the forms or cavity a...

The big challenge of utilizing intermittent renewable energy sources is the time lag between the energy source and energy demand. The storage of energy forms a suitable solution for this challenge. The phase change materials (PCMs) can be used effectively to store a large amount of latent heat during the phase-change process. However, these PCMs su...

This article aims to investigate the flow of water-based nanofluid between two inclined planes that are permitted to stretch/shrink. The Optimal Homotopy Analysis Method (OHAM) has been employed here to handle governing coupled nonlinear Differential Equations (DEs). An efficient approach has been used to calculate the convergence controller parame...

Approximately (97 percent) of the water on Earth is salty or polluted, leaving just 3% as freshwater, only about (1%) of which is easily accessible for human use. The world’s population is increasingly dependent on this priceless resource for electricity, irrigation, industrial processes, and everyday use. Solar desalination is gaining prominence a...

Free convective flow in a cubical cavity loaded with copper-water nanofluid was examined numerically by employing a non-homogeneous dynamic model, which is physically more realistic in representing nanofluids than homogenous ones. The cavity was introduced to a horizontal magnetic field from the left sidewall. Both the cavity's vertical left and ri...

Despite past studies, no comprehensive models or empirical correlations cover all aspects of performances of cooling coils under different flow regimes (laminar, transition, and turbulent). Moreover, the cooling coil is characterized by a highly nonlinear dynamic subject to multiple inputs, coupling between the latent and sensible heat transfer mod...

The steady MHD mixed convection in an inclined wavy 2D cavity is studied numerically in the current paper. The vertical walls of the cavity are wavy and differentially heated. The horizontal walls are adiabatic and driven in the x-direction. The cavity domain is considered porous and filled with a non-Newtonian nanofluid and an external magnetic fi...

In this paper the laminar unsteady natural convection heat transfer of (Al2O3-water) nanofluid inside 3D triangular cross section cavity was investigated. The cavity was heated differentially, the vertical walls were kept at different constant temperatures. The left hot and the right cold. The effect of the solid volume fraction was examined for tw...

The numerical analysis of MHD-free convective heat transfer and its interaction with the radiation over a heated flame inside a porous semicircular cavity loaded with SWCNTs–water nanofluid was explored for the very first time in the present work. The two circular arcs of the upper wall of the enclosure were preserved at a constant cold temperature...

An exploration is sought for improved thermal transportation across an extending inclined sheet in the upper space to be influenced by periodic micro gravity g*(τ)=g0(1+acos(πωt)) and magnetic field B0. The mixed convection induced by g-jitter effects is studied for the flow of two colloidal liquids; the alone micropolar nano fluid (copper/ water)...

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...

The current research presents a numerical investigation of the mixed convection inside a horizontal rectangular duct combined with an open trapezoidal cavity. The region in the bottom wall of the cavity is heated by using two discrete heat sources. The cold airflow enters the duct horizontally at a fixed velocity and a constant temperature. All the...

The heating, ventilating and air conditioning (HVAC) systems energy demand can be reduced by manipulating indoor conditions within the comfort range, which relates to control performance and, simultaneously, achieves peak load shifting toward off-peak hours. Reinforcement learning (RL) is considered a promising technique to solve this problem witho...

To ensure the transfer of thermal energy in high efficiency, a heat exchanger which has the ability to transfer thermal energy in the least time and cost, is used. There are many drawbacks to traditional surface-type heat exchangers, such as the problem of fouling, high resistance to heat transfer to the surface, and increased cost. The technique...

This paper introducing a review of the recent three-dimensional numerical and experimental researches on the laminar natural convection heat transfer inside cavities. Focusing on the previous research’s cavity geometry specially the regular shapes both simple or complex shapes. A wide variety of geometries which having different inclinations, inser...

Natural convection in an F-shaped cavity containing Ag-water non-Newtonian nanofluid (NF) saturated with a porous medium was investigated numerically. The left wall of the cavity was maintained at a constant hot temperature and subjected to a horizontal periodic magnetic field. The right wall was maintained at a constant cold temperature. Both the...

The numerical analysis of a V-shaped baffle effect on the natural convection inside a parallelogrammical cavity filled with two different water-based nanofluids (Al2O3 and Cu) were studied in this work. The enclosure walls were maintained at a constant hot and cold temperatures on the left and right walls sequentially. The horizontal walls were iso...

The effect of magnetic field inclination and double lid‐driven on the mixed convection in a square cavity is investigated based on the local thermal non‐equilibrium model. The cavity was filled with a copper–water micropolar nanofluid saturated with a porous medium. The top and bottom walls are considered moving to the left or right directions at a...

This paper presents a numerical investigation of the natural convection in an inclined rectangular enclosure with a baffle filled with Cu/water and then with Al2O3/water nanofluids using the finite difference method for tracking the thermal behavior within it versus the baffle length. The horizontal enclosure walls are assumed to be adiabatic, whil...

Purpose The purpose of the present work is to investigate the hydrodynamic and thermal performance of a thermal storage based on the numerical and experimental approaches using the lattice Boltzmann method and the experimental observation on the thermo-physical properties of the operating fluid. Design/methodology/approach For this purpose, the Al...

In this paper, the cooling system of a two-dimensional lithium-ion battery pack with 9 battery cells is simulated. The airflow at the Reynolds number range from 80 to 140 flows through the cooling system. In this analysis, the temperature of all 9 battery cells is examined separately. The amount of pressure drop and temperature of the cooling syste...

This chapter presents advances related to applications of nanofluids in various types of solar stills. Works reviewed include theoretical, numerical, and experimental studies related the use of nanofluids in single-slope and double-slope solar stills integrated with a condenser, hybrids, and other limited types of solar stills. To make the chapter...

The importance of air bubble dynamics in liquid is in some phenomena like chemical and biochemical processes in refinery units. The 2D Volume of Fluid (VOF) method together with the CFD technique were employed for simulating. The dynamic meshing technique is used to simulate the hydrodynamics of rising air bubble in liquid water column via the User...

The present paper presents a numerical investigation treating the fluid-structure interaction during CNT-water nanofluid mixed convection in a micro-channel equipped with elastic fins. A numerical framework for simulating the fluid–structure interaction is proposed by using the Finite Element Method (FEM) in COMSOL Multiphysics. To prepare the nume...

Heat pipes are most frequently used for thermal management solutions. Selection of right type of heat pipe for a specific scenario is utmost necessary for best outcomes. The purpose of this research is comparison of thermal performance characteristics of sintered copper wicked and grooved heat pipes, which are mostly used types of heat pipes. Disti...

The present work deals with the experimental investigation of Hemispherical Solar Still (HSS) using different basin materials with and without Internal Reflector (IR). Three solar stills such us HSS with Steel Basin (HSS-SB), HSS with Zinc Basin (HSS-ZB), HSS with Copper Basin (HSS-CB) was fabricated. Experiments was conducted with and without IR....

This study aims to investigate the effect of the cooling load ratio covered by the chilled ceiling on the age of air and comfort level in a classroom in a hot and dry climate in Iraq-Hilla city. Air age, air exchange efficiency, and concentrations of pollutants in a classroom are investigated numerically by used AIRPAK software under displacement v...

Bioconvection for rotational flow is concieved to provide stability to improved thermal transportation for nanofluid flow over Riga plate design. Nanoparticles are considered due to their unusual characteristics like extraordinary thermal conductivity, which are significant in heat exchangers, advanced nanotechnology, electronics, and material scie...

In this research, the entropy production of the conjugate heat transfer in a tilted porous cavity in respect to heat source and solid walls locations has been studied numerically. Three different cases of the cavity with finite walls thickness and heat source locations are considered in the present study. For both cases one and two, the cavity cons...

This paper aims to study the flow of water-Copper nanofluid in a channel formed by two inclined planes, with imprecise nanoparticle volume fraction. In this study, the impreciseness of the volume fraction has been considered as a triangular fuzzy number [0%, 0.1%, 0.2%]. Double parametric concept has been used to handle the fuzziness of the involve...

This study presents a two and three-dimensional numerical simulations of a flow-through a sudden expansion and contraction microchannels. The finite element method was used to discretize the equations governing the physical model. By carrying out the numerical simulations, results indicate the apparition of a separate vortex, situated in the corner...

In this study, a multi-physics coupled mathematical model was established on thermal stress distribution of double-glazed units with phase-change material (PCM-glazed) for the transient temperature fields and non-uniform intermittent solar irradiation, and the mathematical calculations are in good agreement with the experimental results, which show...

This paper discusses the magneto-hydrodynamic natural convection in a cubical cavity equipped with a perforated separation. Several situations related to the number of perforations, magnitude of magnetic field, nanoparticles concentration and Rayleigh number are studied. During this study, the CNT–water filled cavity is differentially heated and a...

An experimental and numerical investigation of a small linear Fresnel for water heating application has been carried out in Blida, Algeria. The numerical simulation with a 1D modeling in transient mode was performed by using the finite difference method. The thermal evaluation is based on the energy assessments characterized by the differential equ...

In recent years, the need to provide a clean environment in enclosed places has drawn increasing levels of attention due to the spread of epidemics and viruses across the world. Chilled ceilings with displacement ventilation represent promising technology. The combined ventilation system has not yet been used in Iraqi buildings, then it's a good st...

Going forward towards developing and improving renewable energies in Algeria is one of the main objectives of this study, especially, solar energy that is an exceptional and continuous source of energy. Algerian Sahara has a large area suitable for agriculture, but not connected to the electricity network. Therefore, the construction of solar power...

The main objective of this study is to conduct a controlled thermal investigation of a small Parabolic Trough Concentrator (PTC) under real climatic conditions for El-Oued region on 16/03/2018, where the water was adopted as a heat transfer fluid. One-dimensional and transient energy balance equations have been analyzed, simplified and then program...

The natural convection heat tranfer in annulate region confined between two homocentric cylinders were numerically studied in the present work. The annulus was filled by ethylene glycol / water based Titania nanofluid. Both internal and external cylinders are presereved at an isothermal hot and cold temperatures respectively, whereas, the upper and...

In this work, the temperature distribution in an indirect solar dryer chamber has been studied experimentally, where this chamber operates under the forced pregnancy influence. The experimental work aims to improve the temperature distribution in the solar dryer chamber, where the chamber is divided into two parts by an aluminum-coated polystyrene...

In order to understand the behavior and to determine the effective operational parameters of a solar-driven ejector air conditioning system at low or medium temperature, a dynamic model depends on the principles of conservation, the momentum mass and energy is developed. For this purpose, the thermodynamic characteristics of the liquid and vapor re...

Present study deals with the flow of a fluid with added nanoparticles in a semi-permeable channel with a transverse magnetic effect. We have used Maxwell-Garnett and Brinkman models for effective electrical conductivity and viscosity, respectively. Water-based nanofluids with silver and copper nanoparticles have been used in the present investigati...

In this study. The mixed convection in a square enclosure with a hot bottom wall and a conductive half‐immersed rotating cylinder from its top wall is investigated numerically. The enclosure is filled with a copper‐water nanofluid. The upper half of the cylinder is cooled by the surrounding air, whereas its solid lower half is exposed to the nanofl...

In this work, a numerical study of mixed convection inside a horizontal channel with an open trapezoidal enclosure subjected to a discrete heat source in different locations is carried out. The heat source with the length of ε = 0.75, is maintained at a constant temperature. The air flow with a fixed velocity and a cold temperature enters the chann...

This comprehensive literature review provides a rich overview of the most recent progress related to the utilization of the nanofluid in various types of the solar stills. This review considers a wide range of theoretical, experimental and numerical research papers related with the nanofluid utilization in the single-slope, double slope, solar stil...