lotfy sakr - Academia.edu (original) (raw)

Papers by lotfy sakr

Research paper thumbnail of Effect of different upstream fittings on orifice meter performance. (Dept. M.)

MEJ. Mansoura Engineering Journal, 2020

Research paper thumbnail of Current Status of the Electronic Waste Problem in Egypt. (Dept. E)

MEJ. Mansoura Engineering Journal, 2021

 I. INTRODUCTION lobally, huge amounts of electric and electronic equipment EEE are put in the m... more  I. INTRODUCTION lobally, huge amounts of electric and electronic equipment EEE are put in the market yearly. This creates huge waste stream of EEE [Khan et al. (2020)]. E-waste is defined as any item of EEE and its parts that have been discarded by the owner as waste. Egypt is a significant market for electrical and electronic

Research paper thumbnail of Modeling of an efficient airblast atomizer for liquid jet into a supersonic crossflow

Acta Astronautica, 2020

The liquid jet from an airblast atomizer into supersonic air crossflow with a Mach number of 1.94... more The liquid jet from an airblast atomizer into supersonic air crossflow with a Mach number of 1.94 was investigated numerically. The detached eddy simulation was used as the turbulence model to compromise the merits of both large eddy simulation and k À ε models. The Kelvin-Helmholtz and Rayleigh-Taylor (KHRT) model was used to simulate the droplet breakup process. The location and velocity of the child droplets are tracked efficiently by the automated tracking scheme. The model was validated using previous experimental data and a good agreement was obtained. In the present study, the airblast atomizer, which allows core and annular air flows with the injected liquid, is utilized instead of the ordinary orifice nozzle to improve the breakup process and the droplet distribution. The airblast atomizer dimensions were represented as factors of the ordinary orifice nozzle and the air mass flow rates through the atomizer were adjusted as ratios from the liquid mass flow rate. The effects of these parameters on the spray structure characteristics were presented. Then, a new proposed design for the airblast atomizer was suggested based on the improvements in spray characteristics dimensions and sauter mean diameter distribution. The core and annular air flows significantly enhanced the spray characteristic dimensions and spray breakup compared with the ordinary orifice nozzle.

Research paper thumbnail of Performance of an Orifice Meter Handling Two-Phase (Gas-Liquid) Flow.(Dept. M)

MEJ. Mansoura Engineering Journal, 2020

and mining transportation processes to measure the two-phase flow rates. Most of engineering syst... more and mining transportation processes to measure the two-phase flow rates. Most of engineering systems have flow rate metering instruments, which mainly are affected by the properties of the two phases and the void fraction values. So, better understandings of the two-phase flow through systems are required to enhance the flow rate measurement accuracy and performance. In the present study, the orifice meter was selected due to its wide use in most engineering applications. The orifice meter is simple in design and construction, and is a limited maintenance metering device. Monni et al. [1] investigated experimentally the annular two-phase flow through a venturi flow meter in a vertical upward pipe (80 mm inner diameter). The experiments were performed at air void fraction values up to 0.97 to simulate nuclear accident cases. The value of the two-phase pressure drop between the venturi flow meter inlet section and throat section, and between inlet section and outlet section were dependent on the two-phase flow parameters (phase velocities, void fraction and dryness fraction). Also, new correlations were proposed to relate the flow rate as a function of the twophase pressure drop.

Research paper thumbnail of Flow Structure Development Due to Injection Water into the Annulus of Heavy Oil Pipe Flow

North Africa Technical Conference and Exhibition, 2012

This work investigates the flow structure development due to injecting water into the annulus of ... more This work investigates the flow structure development due to injecting water into the annulus of heavy oil pipe flow. Numerical simulation of the axisymmetric core annular turbulent flow is carried out using the standard k–ω model. The flow field and flow characteristics are investigated using FLUENT 6.3.26. The core annular flow of heavy oils-water in 15.24 cm diameter pipe, with three core diameters is considered. The influence of flow parameters upon the development of axial and radial velocity, turbulent kinetic energy, turbulent intensity, and strain rate profiles are investigated. Results show that flow development depends on the core to outer diameters ratio, oil viscosity, flow velocity, and water loading ratio. As oil's viscosity increases, flow structure develops faster towards fully developed one. Fully developed velocity profiles show uniform distribution in oil's core, while all velocity changes occur in water flowing in pipe annulus. The flow in the core region...

Research paper thumbnail of Effect of different upstream fittings on orifice meter performance. (Dept. M.)

MEJ. Mansoura Engineering Journal, 2020

Research paper thumbnail of Current Status of the Electronic Waste Problem in Egypt. (Dept. E)

MEJ. Mansoura Engineering Journal, 2021

 I. INTRODUCTION lobally, huge amounts of electric and electronic equipment EEE are put in the m... more  I. INTRODUCTION lobally, huge amounts of electric and electronic equipment EEE are put in the market yearly. This creates huge waste stream of EEE [Khan et al. (2020)]. E-waste is defined as any item of EEE and its parts that have been discarded by the owner as waste. Egypt is a significant market for electrical and electronic

Research paper thumbnail of Modeling of an efficient airblast atomizer for liquid jet into a supersonic crossflow

Acta Astronautica, 2020

The liquid jet from an airblast atomizer into supersonic air crossflow with a Mach number of 1.94... more The liquid jet from an airblast atomizer into supersonic air crossflow with a Mach number of 1.94 was investigated numerically. The detached eddy simulation was used as the turbulence model to compromise the merits of both large eddy simulation and k À ε models. The Kelvin-Helmholtz and Rayleigh-Taylor (KHRT) model was used to simulate the droplet breakup process. The location and velocity of the child droplets are tracked efficiently by the automated tracking scheme. The model was validated using previous experimental data and a good agreement was obtained. In the present study, the airblast atomizer, which allows core and annular air flows with the injected liquid, is utilized instead of the ordinary orifice nozzle to improve the breakup process and the droplet distribution. The airblast atomizer dimensions were represented as factors of the ordinary orifice nozzle and the air mass flow rates through the atomizer were adjusted as ratios from the liquid mass flow rate. The effects of these parameters on the spray structure characteristics were presented. Then, a new proposed design for the airblast atomizer was suggested based on the improvements in spray characteristics dimensions and sauter mean diameter distribution. The core and annular air flows significantly enhanced the spray characteristic dimensions and spray breakup compared with the ordinary orifice nozzle.

Research paper thumbnail of Performance of an Orifice Meter Handling Two-Phase (Gas-Liquid) Flow.(Dept. M)

MEJ. Mansoura Engineering Journal, 2020

and mining transportation processes to measure the two-phase flow rates. Most of engineering syst... more and mining transportation processes to measure the two-phase flow rates. Most of engineering systems have flow rate metering instruments, which mainly are affected by the properties of the two phases and the void fraction values. So, better understandings of the two-phase flow through systems are required to enhance the flow rate measurement accuracy and performance. In the present study, the orifice meter was selected due to its wide use in most engineering applications. The orifice meter is simple in design and construction, and is a limited maintenance metering device. Monni et al. [1] investigated experimentally the annular two-phase flow through a venturi flow meter in a vertical upward pipe (80 mm inner diameter). The experiments were performed at air void fraction values up to 0.97 to simulate nuclear accident cases. The value of the two-phase pressure drop between the venturi flow meter inlet section and throat section, and between inlet section and outlet section were dependent on the two-phase flow parameters (phase velocities, void fraction and dryness fraction). Also, new correlations were proposed to relate the flow rate as a function of the twophase pressure drop.

Research paper thumbnail of Flow Structure Development Due to Injection Water into the Annulus of Heavy Oil Pipe Flow

North Africa Technical Conference and Exhibition, 2012

This work investigates the flow structure development due to injecting water into the annulus of ... more This work investigates the flow structure development due to injecting water into the annulus of heavy oil pipe flow. Numerical simulation of the axisymmetric core annular turbulent flow is carried out using the standard k–ω model. The flow field and flow characteristics are investigated using FLUENT 6.3.26. The core annular flow of heavy oils-water in 15.24 cm diameter pipe, with three core diameters is considered. The influence of flow parameters upon the development of axial and radial velocity, turbulent kinetic energy, turbulent intensity, and strain rate profiles are investigated. Results show that flow development depends on the core to outer diameters ratio, oil viscosity, flow velocity, and water loading ratio. As oil's viscosity increases, flow structure develops faster towards fully developed one. Fully developed velocity profiles show uniform distribution in oil's core, while all velocity changes occur in water flowing in pipe annulus. The flow in the core region...