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Introduction
Mahmoud's research interests lie in the multidisciplinary field of energy, with a current focus on optimising mechanical energy recovery systems, particularly enhancing the performance and efficiency of flywheel energy storage systems through advanced computational and engineering approaches.
Current institution
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September 2020 - January 2024
Education
September 2020 - June 2024
Publications
Publications (24)
Concerns about global warming and the need to reduce carbon emissions have prompted the creation of novel energy recovery systems. Continuous braking results in significant energy loss during urban driving. Flywheel energy storage systems (FESS) can recover and store vehicle kinetic energy during deceleration. In this work, Computational Fluid Dyna...
Flywheel Energy Storage Systems (FESS) are a pivotal innovation in vehicular technology, offering significant advancements in enhancing performance in vehicular applications. This review comprehensively examines recent literature on FESS, focusing on energy recovery technologies, integration with drivetrain systems, and environmental impacts. A det...
Amidst the growing demand for efficient and sustainable energy storage solutions, Flywheel Energy Storage Systems (FESSs) have garnered attention for their potential to meet modern energy needs. This study uses Computational Fluid Dynamics (CFD) simulations to investigate and optimise the aerodynamic performance of FESSs. Key parameters such as rad...
Flywheel energy storage systems (FESSs) have gained significant attention as a promising technology for effective harvesting, storage and redeployment of energy. This technology is used particularly in renewable energy applications where they help manage the intermittency and variability of energy output from renewable sources such as solar and win...
div class="section abstract"> During urban driving, a significant amount of energy is lost due to continuous braking, which can be recovered and stored. The flywheel energy storage system (FESS) can efficiently recover and store the vehicle's kinetic energy during deceleration. However, standby losses in FESS, primarily due to aerodynamic drag, can...
Energy storage has recently emerged as a topic of discussion in the context of the energy transition away from fossil fuels. The flywheel energy storage system (FESS) is gaining popularity due to its distinct advantages, which include long life cycles, high power density, and low environmental impact. However, windage loss significantly contributes...
![Fig. 1.2 Breakdown of energy consumption by sectors. Source De Simone [14]](profile/Mahmoud-Eltaweel/publication/373050510/figure/fig2/AS:11431281180887005@1691756045403/Breakdown-of-energy-consumption-by-sectors-Source-De-Simone-14_Q320.jpg)
Concerns over global warming and the need to reduce carbon emissions have prompted the development of novel energy recovery systems. During urban driving, a significant amount of energy is lost due to continuous braking, which can be recovered and stored. The flywheel energy storage system can efficiently recover and store the vehicle's kinetic ene...
Flywheel energy storage has emerged as a viable energy storage technology in recent years due to its large instantaneous power and high energy density. Flywheel offers an onboard energy recovery and storage system which is durable, efficient, and environmentally friendly. The flywheel and the housing surface temperatures can be considerably influen...
This study focuses on the thermal and rheological properties of a hybrid fluid consisting of Titanium Dioxide/Chemically functionalized Multi-Walled Carbon Nanotubes (TiO2 / CF-MWCNTs) suspended in distilled water (DW) for use in flat plate solar collectors applications. The optimal hybridization ratio of CF-MWCNTs : TiO2 was 40:60. To evaluate the...
![Comparison between the experimental [45] and numerical results: (a)...](publication/369014628/figure/fig3/AS:11431281127485125@1679034030978/Comparison-between-the-experimental-45-and-numerical-results-a-average-Nusselt_Q320.jpg)
Mono, hybrid, and ternary nanofluids were tested inside the plain and twisted-tape pipes using k-omega shear stress transport turbulence models. The Reynolds number was 5,000 ≤ Re ≤ 15,000, and thermophysical properties were calculated under the condition of 303 K. Single nanofluids (Al2O3/distilled water [DW], SiO2/DW, and ZnO/DW), hybrid nanoflui...
Seawater desalination using solar energy is a promising solution for addressing water scarcity in arid and semi- arid regions, as it not only provides a reliable source of fresh water, but also utilizes the abundant solar energy resources in the region to power the desalination process in a sustainable way. For this, the aim of this research is to...
Recent technological advances have made it possible to produce particles with nanometer dimen�sions that are uniformly and steadily suspended in traditional solar liquids and have enhanced the impact of thermo-physical parameters. In this research, a three-dimensional flat plate solar col�lector was built using a thin flat plate and a single workin...
Chillers are responsible for almost half of the total energy demand in buildings. Hence, the obligation of control systems of multi-chiller due to changes indoor environments is one of the most significant parts of a smart building. Such a controller is described as a nonlinear and multi-objective algorithm, and its fabrication is crucial to achiev...
The heat transfer improvement using nanofluids inside varying shape heat exchangers is a still challenge to avoid from heat losses in chemical and petrochemical industries. In the stated study, the friction loss (f), pressure drop (∆P), average heat (have) transfer and average Nusselt (Nuave) numbers were evaluated numerically (ANSYS-FLUENT) and ex...
Covalent and non-covalent nanofluids were tested inside a circular tube fitted with twisted tape inserts with 45° and 90° helix angles. Reynolds number was 7000 ≤ Re ≤ 17,000, and thermophysical properties were assessed at 308 K. The physical model was solved numerically via a two-equation eddy-viscosity model (SST k-omega turbulence). GNPs-SDBS@DW...
In recent studies, Thermo-Electric Coolers (TEC) have been utilized for dehumidification purposes, which is mainly based on the extraction of moisture from humid atmospheric air. The reviewed literature showed that the rate of water collection from the TEC-based system can be affected by various parameters such as the module's input voltage, the he...
Egypt has a significant role in the international energy transit being one of the major economies in the African continent, however its energy sector is still overwhelmed with the local energy demands. It has been predicted that Egypt's CO2 emissions could increase by around 125%, over the period from 2012 to 2035, if the nation's energy demand is...
The continuous increase in energy demand is a challenge for the human future. During the last century, researchers have been concerned with finding efficient methods to generate energy from renewable sources, especially solar energy. Evacuated tube and flat-plate solar collectors are simple, inexpensive systems for domestic applications. The replac...
Fossil fuels demonstrate pollution effects and significant emissions on the atmosphere, which made the use of clean, renewable sources of energy a necessity. Renewable energy has many sources, but the most promising and cheapest energy source is solar energy, which has led to a focus on efficient solar energy harvesting to be cheaper for public use...
Increasing the energy demand and the limited availability of conventional energy sources are the main challenges to secure the human future. Solar energy is an attractive source of energy to ensure the sustainability of energy in this world for now and for the future. Evacuated tube solar collector is a solar thermal collector mostly used for domes...
Stationary solar collector such as flat-plate collector is a thermal device, which traps solar energy and converts it into heat that can be used in industrial and domestic applications such as water heating. Flat-plate collector thermal performance enhancement is investigated in this research paper. Two crosssectional geometries of the tube in the...
The scientific community has focused on the use of nanofluids to enhance solar collectors’ thermal efficiency. Solar energy is considered an extensively available energy resource with a weak effect on the environment. Stationary solar collectors such as flat-plate solar collector and evacuated tube solar collector are the most common solar collecto...
The scientific community has focused on the use of nanofluids to enhance solar collectors' thermal efficiency. Solar energy is considered an extensively available energy resource with a weak effect on the environment. The flat-plate solar collector is considered to be the most common collector used, but the efficiency of the collector has limitatio...
Questions
Questions (2)
I am interested to simulate the drag coefficient of a rotating shape in a vacuum, however from what I read I cannot use ANSYS Fluent because Navier-Stokes equations won't be valid. Is there any software that can simulate a vacuum?
I am working on Taylor Couette flow between concentric cylinders and the results are correct for the full case. however, I wanted to do symmetry case to improve the mesh. I have tried periodic symmetry and cyclic symmetry but both give me wrong results. I do not know that is wrong but I have been trying for more than a month and I don't know what am I doing wrong.
Thank you in advance
