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Papers by Ibrahim Elbadawy

Materials Characterization

Processes

Nanofluid, the fluid suspensions of a metallic nanoparticle, became a coolant fluid that is used ... more Nanofluid, the fluid suspensions of a metallic nanoparticle, became a coolant fluid that is used when a promising enhancement in heat transfer is required. In the current study, the characteristics of fluid flow and heat transfer are numerically investigated using different nanofluids (Al2O3–H2O, TiO2–H2O, and SiO2–H2O) and different micro-channel heat sink (MCHS) configurations (rectangular, triangular, trapezoidal, and circular). In this numerical investigation, the effect of Re number ranged from 890 to 1500, and the effect of nanoparticle concentration ranged from 1% to 7% at constant heat flux q = 106 W/m2, and constant fluid inlet temperature of 288 K, were studied. The average heat transfer coefficient, h, and pressure drop, Δp, are used to quantify the fluid flow and heat transfer characteristics in each MCHS configuration and for each nanoparticle concentration. It is revealed that a better heat transfer coefficient is obtained for Al2O–H2O compared with other types of nano...

International Research Journal of Innovations in Engineering and Technology, 2021

In this study, the performance estimations of a land-based gas turbine engine were done consideri... more In this study, the performance estimations of a land-based gas turbine engine were done considering hot climate regions and therefore deviations from standard day 15°C conditions. In hot climate countries like Kuwait, ambient air temperature often reaches and exceeds 50ºC, which makes dramatic performance reductions for the gas turbine engines. The gas turbine performance output parameters were calculated in a range of ambient air temperature (15°C-55°C). Results show that for a 43 MW class gas turbine engine at 55°C ambient condition, the shaft power output decreases 21.3% and power specific fuel consumption (PSFC) increases 9.31%. Thermal efficiency also decreases from 41.90% standard day value to 38.34%.

Alexandria Engineering Journal

Transportation Research Part D: Transport and Environment

Advances in Mechanical Engineering

Enhancing the ejector entrainment ratio plays an important role in the ejector performance. In th... more Enhancing the ejector entrainment ratio plays an important role in the ejector performance. In this article, a surrogate-based optimization approach along with computational fluid dynamics technique has been employed to optimize the entrainment ratio of a single-phase ejector working with natural gas. Nine ejector geometrical factors have been varied to maximize the ejector entrainment ratio. Validation results of the presented computational fluid dynamics model were in a good agreement with the experimental data from the literature with an average error of 0.6% in the critical mode. Reported results showed that the optimum design achieves entrainment ratio of 19.45% at 12, 2, and 5.2 MPa motive pressure, induced pressure, and discharge pressure, respectively. Moreover, the primary nozzle convergent angle and throat length are insignificant factors. Furthermore, secondary nozzle inclination angle has a minor effect on the entrainment ratio of the optimum design.

The International Conference on Applied Mechanics and Mechanical Engineering

International Journal of Automotive Technology

International Journal of Multiphase Flow, 2015

A numerical investigation is performed into the effects of the root mean square (RMS) turbulence ... more A numerical investigation is performed into the effects of the root mean square (RMS) turbulence velocity on the spray characteristics of liquid fuel injected into a constant volume vessel and comparison drawn with experimental data obtained for the case of iso-octane fuel injected into nitrogen showing good agreement between the two. A detailed parametric study is undertaken, enabling the effect of ambient turbulence on key spray characteristics to be determined. The numerical solutions obtained reveal how an increased level of turbulence in the gas into which fuel is injected leads to reductions in the axial fuel penetration and the Sauter mean droplet diameter, together with increases in radial vapour penetration and the number of fuel droplets formed.

Atomization and Sprays, 2011

Symposium (International) on …

The objective of this work was to specify the mechanism of flame inhibition by compounds that do ... more The objective of this work was to specify the mechanism of flame inhibition by compounds that do not contain bromine. Mole fraction profiles have been measured by molecular beam-mass spectrometer technique in a stoichiometric CH 4 /O 2 /Ar low-pressure flame seeded with ...

Materials Characterization

Processes

Nanofluid, the fluid suspensions of a metallic nanoparticle, became a coolant fluid that is used ... more Nanofluid, the fluid suspensions of a metallic nanoparticle, became a coolant fluid that is used when a promising enhancement in heat transfer is required. In the current study, the characteristics of fluid flow and heat transfer are numerically investigated using different nanofluids (Al2O3–H2O, TiO2–H2O, and SiO2–H2O) and different micro-channel heat sink (MCHS) configurations (rectangular, triangular, trapezoidal, and circular). In this numerical investigation, the effect of Re number ranged from 890 to 1500, and the effect of nanoparticle concentration ranged from 1% to 7% at constant heat flux q = 106 W/m2, and constant fluid inlet temperature of 288 K, were studied. The average heat transfer coefficient, h, and pressure drop, Δp, are used to quantify the fluid flow and heat transfer characteristics in each MCHS configuration and for each nanoparticle concentration. It is revealed that a better heat transfer coefficient is obtained for Al2O–H2O compared with other types of nano...

International Research Journal of Innovations in Engineering and Technology, 2021

In this study, the performance estimations of a land-based gas turbine engine were done consideri... more In this study, the performance estimations of a land-based gas turbine engine were done considering hot climate regions and therefore deviations from standard day 15°C conditions. In hot climate countries like Kuwait, ambient air temperature often reaches and exceeds 50ºC, which makes dramatic performance reductions for the gas turbine engines. The gas turbine performance output parameters were calculated in a range of ambient air temperature (15°C-55°C). Results show that for a 43 MW class gas turbine engine at 55°C ambient condition, the shaft power output decreases 21.3% and power specific fuel consumption (PSFC) increases 9.31%. Thermal efficiency also decreases from 41.90% standard day value to 38.34%.

Alexandria Engineering Journal

Transportation Research Part D: Transport and Environment

Advances in Mechanical Engineering

Enhancing the ejector entrainment ratio plays an important role in the ejector performance. In th... more Enhancing the ejector entrainment ratio plays an important role in the ejector performance. In this article, a surrogate-based optimization approach along with computational fluid dynamics technique has been employed to optimize the entrainment ratio of a single-phase ejector working with natural gas. Nine ejector geometrical factors have been varied to maximize the ejector entrainment ratio. Validation results of the presented computational fluid dynamics model were in a good agreement with the experimental data from the literature with an average error of 0.6% in the critical mode. Reported results showed that the optimum design achieves entrainment ratio of 19.45% at 12, 2, and 5.2 MPa motive pressure, induced pressure, and discharge pressure, respectively. Moreover, the primary nozzle convergent angle and throat length are insignificant factors. Furthermore, secondary nozzle inclination angle has a minor effect on the entrainment ratio of the optimum design.

The International Conference on Applied Mechanics and Mechanical Engineering

International Journal of Automotive Technology

International Journal of Multiphase Flow, 2015

A numerical investigation is performed into the effects of the root mean square (RMS) turbulence ... more A numerical investigation is performed into the effects of the root mean square (RMS) turbulence velocity on the spray characteristics of liquid fuel injected into a constant volume vessel and comparison drawn with experimental data obtained for the case of iso-octane fuel injected into nitrogen showing good agreement between the two. A detailed parametric study is undertaken, enabling the effect of ambient turbulence on key spray characteristics to be determined. The numerical solutions obtained reveal how an increased level of turbulence in the gas into which fuel is injected leads to reductions in the axial fuel penetration and the Sauter mean droplet diameter, together with increases in radial vapour penetration and the number of fuel droplets formed.

Atomization and Sprays, 2011

Symposium (International) on …

The objective of this work was to specify the mechanism of flame inhibition by compounds that do ... more The objective of this work was to specify the mechanism of flame inhibition by compounds that do not contain bromine. Mole fraction profiles have been measured by molecular beam-mass spectrometer technique in a stoichiometric CH 4 /O 2 /Ar low-pressure flame seeded with ...