Ahmed Abdel Gawad

Zagazig University · Department of Mechanical Power Engineering

The world is increasingly shifting toward low-head hydropower as a sustainable form of renewable energy in response to the negative socioeconomic impacts of large hydroelectric plants. In this context, the article presents a novel design involving retrofitting the gates of existing dam structures with Dethridge waterwheel technology. This innovativ...

Solar energy has become one of the major players in the renewable energy market all over the world. Solar-power plants are divided into two main types: photovoltaic (PV) power plants, which depend on converting the diffuse radia tion energy from the sun into electricity, and concentrated solar-power plants (CSP), which depend on collecting heat...

INFLUENCE OF VENTILATION TO LIMIT AIRBORNE INFECTION CONCENTRATION IN AN ISOLATION ROOM Coronavirus (COVID-19) was detected at the end of 2019 and has since caused a worldwide pandemic. This virus is transferred airborne. In this study, an investigation was carried out of the ventilation strategies inside the isolation room based on exhaust air loc...

At the end of 2019, the COVID-19 virus began to appear and quickly spread throughout the world. It transmits the infection to the respiratory tract by the transmission of pathogens within bioaerosols during speaking, coughing, and sneezing. Therefore, understanding the dynamics of aerosols plays an important role in developing mitigation strategies...

A novel coronavirus (COVID-19) was detected in China at the final of 2019 and has since caused a worldwide pandemic. This virus is transferred by airborne, sneezing, and speaking. Because COVID-19 is highly infectious through airborne contamination, the high infection risk in the medium environment is a serious problem for both healthcare workers a...

Since the emergence of the COVID-19 pandemic, complications for healthcare workers in hospitals have increased. Healthcare workers have had to develop innovative solutions to deal with the shortage of resources and isolation rooms for those infected with the coronavirus. One of the solutions used is to convert the general patient room into a negati...

This study concerns the evaluation and development of the performance of MQ-1 Predator airplane from the aspects of design, and manufacturing. Based on the design and aerodynamic performance aspects, the computational models were developed by ANSYS-Fluent software to determine the aerodynamic characteristics of the baseline design and to study modi...

This paper gives details of the simulation model including method, flow field, corresponding boundary conditions, geometry, and computational mesh. It then shows the train's aerodynamic flow and loads with a range of variable operating speeds and incoming wind speeds. The aerodynamic interaction between a moving train and the transverse wind is exp...

Modern high-speed trains' increasing velocity and decreased mass raise the topic of how severe cross winds may affect their aerodynamics. High-speed trains' running stability may be impacted by strong crosswinds due to the magnified aerodynamic forces and moments. The study of train aerodynamics under the effect of crosswind is growing with the hel...

The studying of sloshing is very important because it has widespread applications in many industries such as automotive, ship building, and aerospace. The load experienced by the tank because of sloshing causes great structural stresses that may lead to a great damage. Sloshing occurs in all types of vehicles that undergo sudden accelerated or dece...

This study concerns the evaluation and development of the performance of MQ-1 Predator airplane from the aspects of design, and manufacturing. Based on the design and aerodynamic performance aspects, the computational models were developed by ANSYS-Fluent software to determine the aerodynamic characteristics of the baseline design and to study...

The studying of sloshing is very important because it has widespread applications in many industries such as automotive, ship building, and aerospace. The load experienced by the tank because of sloshing causes great structural stresses that may lead to a great damage. Sloshing occurs in all types of vehicles that undergo sudden accelerated or...

Modern high-speed trains' increasing velocity and decreased mass raise the topic of how severe cross winds may affect their aerodynamics. High-speed trains' running stability may be impacted by strong crosswinds due to the magnified aerodynamic forces and moments. The study of train aerodynamics under the effect of crosswind is growing with th...

This paper gives details of the simulation model including method, flow field, corresponding boundary conditions, geometry, and computational mesh. It then shows the train's aerodynamic flow and loads with a range of variable operating speeds and incoming wind speeds. The aerodynamic interaction between a moving train and the transverse wind i...

This study concerns the evaluation and development of the performance of MQ-1 Predator airplane from the aspects of design, and manufacturing. Based on the design and aerodynamic performance aspects, the computational models were developed by ANSYS-Fluent software to determine the aerodynamic characteristics of the baseline design and to study modi...

Thermoelectric cooling has a high quality of temperature control compared to Vapor Compression Cooling. This paper presents a numerical and experimental study on the effect of the cold-side heat sink design and the operating condition of its fan on the performance of thermoelectric compartment of a hybrid demotic-refrigerator. The hybrid refrigerat...

A solar heating system is a set of combined components and subsystems whose main objective is to use solar energy and convert it into hot water for domestic use. In the present research, two cases of the solar system are compared. The first case is the traditional case, which is a solar heating system that contains only one storage tank. The se...

Nanofluids have been extensively studied in recent decades and have been regarded as “next�generation heat transfer fluids” due to their superior properties. However, dispersion stability and application at higher temperatures are among the challenges that must be overcome. In this work, a new class of stable hybrid nanofluid based on multi-walled...

Plenary Talk

High speed rail systems have significantly developed due to the increased demand on the rail transportation in the recent years. The necessity for enhancing the environmental sustainability of the rail systems imposed many challenges for the researchers to decrease the level of noise generated by the high speed rail systems. This paper aims to inve...

Pedal power is the transfer of energy from a human source through the use of a foot pedal and crank system. This technology is most commonly used for transportation and has been used to propel bicycles for over a hundred years. Pedal power generating system is a combination of different technologies, manpower and bicycle as most important. Pedal po...

Pedal power is the transfer of energy from a human source through the use of a foot pedal and crank system. This technology is most commonly used for transportation and has been used to propel bicycles for over a hundred years. Pedal power generating system is a combination of different technologies, man-power and bicycle as most important. Pedal p...

Renewable energy is becoming an increasingly cost-effective commercial preference for airports due to technological progress, market maturity, and public-sector investment. Airports are highly energy intensive. The increase in passenger and air cargo traffic has led to the increase of energy requirements. The solar energy reduces the airport ope...

The main objective of the present research is to design a hybrid wind and solar energy-supply system for a rural residential building to meet its energy demands. The monthly averaged daily energy consumption for the dwelling was found to vary between 19 and 36 kWh. The system under consideration included some subsystems, namely: the hot-water servi...

In the firm belief that the world needs green, renewable and more efficient energy resources, the present paper is concerned with developing a new design for horizontal-axis wind-turbine (HAWT) blades. The flower of Nelumbo nucifera (Sacred Lotus) was the motive for the present design of a three-blade wind turbine. Nelumbo Nucifera flower has an ae...

Renewable energy has become an increasingly cost-effective commerce preference for airports on account of technological advancement, market ripeness and public-sector investment. Airports have merits that promote the financial viability of on-site renewable energy, in particular for solar photovoltaics (PV). Solar energy systems can produce electri...

This paper presents a CFD and experimental study of the thermal behavior of the thermoelectric-compartment in a hybrid household-refrigerator that combines thermoelectric and vapor-compression technologies. The hybrid refrigerator has three compartments. One of them is driven by a thermoelectric cooling system, which was made of one Peltier module...

SOLAR PONDS: Challenges of Design, Construction, and Operation

This paper shows different simulations of airflow patterns for the human face during exhalation with and without wearing a protective mask. The nasal airways were defined based on biological anthropology and medicine instructions. A three-dimensional body-manikin of African athlete of 1.8 meters tall was employed to the expiration (exhalation) flow...

The objective of this paper is to automatically generate blade profiles using control points and evaluate aerodynamic performance for different values of camber and maximum thickness of compressor-blade C4-base-profile. Solidworks software was used, which is a very helpful tool that gives flow visualization of how well the streamlines distribute ar...

Fluid is classified as non-Newtonian when its flow and viscosity behavior does not agree with the Newton`s law of viscosity. Its behavior can be specified with different theories, and each theory depends on more than one parameter. But each of these theories verifies that its viscosity changes with the applied loading rate. This paper introduces a...

Fluid is classified as non-Newtonian when its flow and viscosity behavior does not agree with the Newton`s law of viscosity. Its behavior can be specified with different theories, and each theory depends on more than one parameter. But each of these theories verifies that its viscosity changes with the applied loading rate. This presentation introd...

In this paper, a computational aerodynamic study is performed on the aircrafts during aerial-refueling operation in four different flight scenarios. The intended results are pressure and velocity contours around the aircrafts. Understanding the mutual effect of the aircrafts on each other may help for better design of the refueling systems and mane...

Engine produces a high amount of heat while running, which is about one-third of the total power. This heat can raise the engine temperature to a very high level and damage or seize the engine components. Hence, for the safety of the engine components, it needs to run at much lower temperature, which is called engine working temperature. Ra...

In the firm belief that the world needs green, renewable and more efficient energy resources, the present paper is concerned with developing a new design for horizontal-axis wind-turbine (HAWT) blades. The flower of Nelumbo nucifera (sacred lotus) was the motive for the present design of a three-blade wind turbine. Nelumbo nucifera flower has...

In the present work, all pieces of information were collected to use science to document the effectiveness of urban trees and shrubs in removing air pollution. Our goal is to use the science to demonstrate the power of trees in purifying the air from pollutants. Removing pollution is one of the different ways that forests and trees affect the...

The power and torque obtained from an IC engine depend basically on the amount of charge or mixture entering the cylinder. In Formula Student competition, the power and torque are crucial for the dynamic events and tests that the car must pass as autocross, endurance, and accelerating. The system responsible of delivering the charge to the eng...

By the increase of earth's surface roughness over cities, forests, hills and mountains, the airflow is displaced largely from its original level. It may result in triggering convection, gravity waves, or tend to return to its original level causing standing waves. For aircrafts, it may cause the wind to change its direction; changing the lift...

Vertical-axis wind turbines are resurfacing, especially in the residential and small-scale power generation units. In 2020, the global market of vertical-axis wind turbines (VAWTs) has grown by about 4.4% CAGR (Compound Annual Growth Rate) over the last few years with a 12.6 billion USD market by 2019. The number of patents related to VAWTs has...

Aerodynamic characteristics take part in reducing the coefficient of drag and therefore reducing fuel consumption. Nowadays, sports cars have become more popular around the world. Bugatti Chiron is the world's fastest, most powerful, luxurious, and exclusive production super sports car [1]. This paper presents a computational simulation of fl...

In this paper, a computational aerodynamic study is performed on the aircrafts during aerial-refueling operation in four different flight scenarios. The intended results are pressure and velocity contours around the aircrafts. Understanding the mutual effect of the aircrafts on each other may help for better design of the refueling systems and...

In this paper, ANSYS-Fluent software was used to analyze the aerodynamic performance of a propeller that was used in our graduation project (Quadcopter). The main objective is to get the thrust force, which was generated by this propeller to match the weight and payload of the Quadcopter model. The present model was designed by Solidworks soft...

Bugatti Chiron is the world's fastest, most powerful, luxurious, and exclusive production super sports car [1] and there is a great attention about its aerodynamic behavior. This paper presents a computational simulation of flow around the Bugatti Chiron with a spoiler positioned at the rear end of the car at different angles of attack from t...

Even a small change in the speed of the MIG-29 can completely change the pressure distribution on it. Deep research and continuous investigations are required to understand the aerodynamics of this complex flow. This paper aims to understand the influence of the change of speed on the pressure distribution of the flow. It was found that, by in...

The present work represents a proposed scheme for energy management and saving of the famous Clock-Tower in Makkah that is next to the holy mosque. This tower comprises many commercial and residential activities, which consumes huge amounts of electric power every year. Thus, implementation of renewable energy utilities helps greatly in reduci...

This study describes the effect of blade angle on the aerodynamic performance of small-scale Archimedes spiral�wind-turbine blades. The computational approach was used to predict the aerodynamic performance of the scaled-down rotor blades. Blade angle is defined by the angle between the rotational axis and the tip of the blade, which varied fro...

This paper shows different simulations of airflow patterns for the human face during exhalation with and without wearing a protective mask. The nasal airways were defined based on biological anthropology and medicine instructions. A three-dimensional body-manikin of African athlete of 1.8 meters tall was employed to the expiration (exhalation)...

This study describes the effect of aspect ratio on the aerodynamic performance of small-scale Archimedes spiral-wind-turbine. The computational approach was used to predict the aerodynamic performance of the scaled-down rotor blades. Aspect ratio is defined by the ratio of turbine diameter to its length. The present study includes five differen...

Nowadays, it is clear that oil resources are running short very rapidly. Therefore, there is a real need to depend on renewable energy resources. One of the famous renewable energy resources is the solar energy especially in warm sunny countries. Solar tree represents a new technique that is suitable for small-scale urban applications. Solar t...

The objective of this paper is to automatically generate blade profiles using control points and evaluate aerodynamic performance for different values of camber and maximum thickness of compressor-blade C4-base�profile. Solidworks software was used, which is a very helpful tool that gives flow visualization of how well the streamlines distribu...

The main objective of the present research isto design a hybrid wind and solar energy-supply system for a rural residential building to meet its energy demands. The monthly averaged daily energy consumption for the dwelling was found to vary between 19 and 36 kWh. The system under consideration included some subsystems, namely: the hot-water se...

Renewable energy has seen great growth because it is sustainable, has no pollution effects, and not subject to oil or gas reserves. Hydroelectric power is the cheapest type of renewable energy worldwide, even though it had limited growth in the past decades. Oscillating-hydrofoil turbine is a new type of hydroelectric turbines operating in con...

This paper presents analysis the thermal behavior of thermoelectric compartment in of the hybrid household refrigerator combines the thermoelectric and vapor-compression technologies. The hybrid refrigerator has three compartments, one of them driven by thermoelectric cooling system which made up of one Peltier module and heat sink with fan mo...

Renewable energy has become an increasingly cost-effective commerce preference for airports on account of technological advancement, market ripeness and public-sector investment. Airports have merits that promote the financial viability of on-site renewable energy, in particular for solar photovoltaics (PV). Solar energy systems can produce ele...

This paper presents an experimental study for a hybrid domestic refrigerator that comprises thermoelectric and vapor-compression technologies. The hybrid refrigerator consists of three compartments; one of them is operated by a thermoelectric cooling system, which is based on the Peltier module. Two fan-cooled heat sinks are attached to both si...

This paper shows different simulations of airflow patterns for the human face during exhalation with and without wearing a protective mask. The nasal airways were defined based on biological anthropology and medicine instructions. A three-dimensional body-manikin of an African athlete of 1.8 meters tall was employed to the expiration (exhalation) f...

In the firm belief that the world needs green, renewable and more efficient energy resources, the present paper is concerned with developing a new design for horizontal-axis wind-turbine (HAWT) blades. The flower of Nelumbo nucifera (sacred lotus) was the motive for the present design of a three-blade wind turbine. Nelumbo nucifera flower has aerod...

In this paper, a computational aerodynamic study is performed on the aircrafts during aerial-refueling operation in four different flight scenarios. The intended results are pressure and velocity contours around the aircrafts. Understanding the mutual effect of the aircrafts on each other may help for better design of the refueling systems and mane...

The power and torque obtained from an IC engine depend basically on the amount of charge or mixture entering the cylinder. In Formula Student competition, the power and torque are crucial for the dynamic events and tests that the car must pass as autocross, endurance, and accelerating. The system responsible of delivering the charge to the engine i...

Engine produces a high amount of heat while running, which is about one-third of the total power. This heat can raise the engine temperature to a very high level and damage or seize the engine components. Hence, for the safety of the engine components, it needs to run at much lower temperature, which is called engine working temperature. Radiator...