H. A. Warda

H. A. Warda
Alexandria University | AU · Department of Mechanical Engineering

Doctor of Philosophy, Leeds university, England

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36
Publications
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364
Citations
Introduction
Skills and Expertise

Publications

Publications (36)
Preprint
Full-text available
We generalize to 3D a recently developed improved multi-component pseudopotential lattice Boltzmann method and analyze its applicability to simulate flows through realistic porous media. The model is validated and characterized via benchmarks, and we investigate its performance by simulating the displacement of immiscible fluids in 3D geometries. T...
Article
Full-text available
This paper discusses the technical and economic feasibility of a renewable energy-based system, aimed to replace the traditional diesel engines implemented on a pushed and pusher bulk carrier barge. This barge has a challenging navigational route in the Nile River from Alexandria to Aswan and vice versa. It is scheduled to complete 30 trips annuall...
Article
Full-text available
Immiscible fluid displacement in porous media occurs in several natural and industrial processes. For example, during petroleum extraction from porous rock reservoirs, water is used to displace oil. In this paper, we investigate primary drainage and imbibition in a heterogeneous porous medium using an improved numerical model based on the multicomp...
Preprint
Full-text available
In this work, we introduce an improved multicomponent (MC) pseudopotential lattice Boltzmann method (LBM) for the simulation of immiscible fluids displacement in porous media. The model is based on a set of recent developments from the literature in addition to a newly introduced treatments of the pressure boundary conditions at the inlet and outle...
Conference Paper
Full-text available
this paper discusses the technical and economic feasibility of replacing the traditional diesel engine, used in driving a bulk carrier barge with a load capacity of 850 tons operating in the river Nile on the Alexandria/Aswan route, with a renewable energy-based system that utilizes Solar Panels as an energy source and hydrogen gas as an energy sto...
Article
Full-text available
The present study deals with the computational simulation of transient events of water hammer and column separation in a water pipeline system. Three-dimensional CFD simulations based on the Finite-Volume (FV) approach are performed to predict pressure fluctuations and to visualize liquid column separation/rejoining caused by the sudden closure of...
Article
Full-text available
The flow of barrier fluid through an industrial pressurized dual mechanical seal cartridge is investigated and evaluated experimentally and numerically. The cartridge is of the bi-directional type wherein it is radial-flow designed and fitted with a bi-directional integral pumping ring. The standard k–ϵ turbulence model is applied and the multiple...
Article
Full-text available
In this study, air-water flow in a downward sloping pipe subsequent to the entrapping of an air pocket is investigated both numerically and experimentally. A transient, two-dimensional computational fluid dynamics model is applied to study the different possible flow regimes and their associated phenomena. The numerical model is based on the Reynol...
Article
Full-text available
Radial flow pumping rings receive the flow radially which is perpendicular on the shaft while axial flow pumping rings receive the flow in a direction parallel to the shaft (axially). An experimental investigation is carried out to evaluate the single axial pumping ring performance with a non API design radial clearance. The experimental setup is c...
Article
Full-text available
A numerical study is conducted to simulate the performance of barrier fluid flow through a bi-directional dual mechanical seal with an integral radial pumping ring. Standard K-ε model is implemented as a turbulence model. Multiple Reference Frame approach is implemented to model the rotation of the pumping ring. The present study is a sequel to a p...
Article
Full-text available
An experimental study is carried out investigating hydraulic performance for various designs of dual-mechanical-seal cartridges with integral pumping-rings. The tested devices are classified into two main families: radial-flow and axial-flow. The radial-flow family utilizes the modified-paddle-wheel (MPW) pumping ring with either a radial or a tang...
Conference Paper
Full-text available
Under and over filing for blade trailing edge are considered a common practice that is used to modify centrifugal pump performance. In this paper a three-dimensional simulation is presented to predict the effect of changing blade trailing edge profile on the performance of centrifugal pump of ns=9.5 (metric). Around 1,000,000 cells are used to solv...
Article
In this work, the Lattice Boltzmann method (LBM) is used to simulate the fluid displacement processes of primary drainage and imbibition in a randomly generated heterogeneous porous medium. The present procedure is based on the single-relaxation-time Bhatnagar–Gross–Krook (BGK) approximation and the original Shan-Chen multi-component multiphase (MC...
Conference Paper
Full-text available
An experimental investigation is carried out to evaluate the performance of bi-directional pumping ring for dual mechanical seals. An experimental setup is constructed, and appropriate instrumentation are employed to measure the pressure, temperature, and flow rate of the barrier fluid. The experimental study focused on the influence of the kinemat...
Article
Full-text available
An experimental and numerical investigation is carried out to evaluate the performance of alternative pumping ring designs for dual mechanical seals. Both radial-flow and axial-flow pumping rings are considered in the present study. An experimental setup is constructed, and appropriate instrumentation are employed to measure the pressure, tem-perat...
Conference Paper
Full-text available
The SUMED pipeline is a major oil transport pipeline in the Middle East. It provides an important route for transporting oil from the Arabian Gulf region to Europe and North America. The pipeline was subjected to major damage in the 1990s, which required the replacement of several kilometers at its peak point. Fluid hammer simulations using the met...
Conference Paper
Full-text available
The performance of 3 stage air valve has been investigated experimentally. Throughout this work, more understanding of the dynamic behavior of air valves during transient is achieved. A wide range of tests were conducted, the aim of which were to obtain a graphical representation of the differential pressure versus water discharge rate characterist...
Conference Paper
Column separation phenomenon occurring downstream of a closing valve, simulating the closure of non-return/check valve downstream of pumps due to pump trip is simulated. An improved understanding of how cavity is opened, grows and collapses is supported by comparing numerical results with measured values and analyzing video frames. In the present s...
Article
Air-lift pumps are finding increasing use where pump reliability and low maintenance are required, where corrosive, abrasive, or radioactive fluids in nuclear applications must be handled and when a compressed air is readily available as a source of a renewable energy for water pumping applications. The objective of the present study is to evaluate...
Article
Full-text available
The aim of the present paper is to show the capability of using pressure transients, generated by full or partial closure of an upstream valve in leak detection and localization. The valve in this case could be located in the pumping station where all sensors and data acquisition systems could be installed. A numerical model based on the Method of...
Article
Full-text available
The aim of the present study is to investigate the feasibility of using the analysis of pressure transients, generated by full closure of a downstream solenoid control ball valve, in leak detection and localization. A numerical model is developed to simulate pressure transients in leaking viscoelastic pipes. The model accounts for complex pipe char...
Article
Based on the control volume approach, a theoretical model is developed to predict the airlift-pump performance in air–water–solid three-phase flow. Experiments were performed using coarse, irregular non-uniform crushed pink limestone particles. The effect of the submergence ratio and size of solid particles on the pump performance are investigated....
Conference Paper
Full-text available
The supersonic locally-conical flow over a 5 semi-apex circular cone at a Mach number of 1.8 and angles of attack (AOA) ranging from 10 to 35 is studied computationally using the three-dimensional Navier-Stokes equations. An implicit upwind flux-difference splitting scheme was used to obtain the numerical solution of the governing equations. Thr...
Conference Paper
Full-text available
In the present study, a more realistic approach for using pressure transient analysis in leak detection and localization is proposed. In a previous publication [1] by the authors, the feasibility of using pressure transients, generated by full closure of a downstream solenoid control ball valve, in leak detection and localization is investigated. T...
Article
Full-text available
In this study, a numerical model based on the Method of Characteristics (MOC) is developed for modeling pressure transients in viscoelastic pipelines in the presence of column separation. The model is capable of modeling complex phenomena, which could not be modeled by the standard MOC, such as unsteady friction and viscoelastic behavior of the pip...
Article
Full-text available
In this study, a numerical model based on the Method of Characteristics (MOC) is developed for modeling pressure transients in viscoelastic pipes. The model is capable of dealing with unsteady friction and viscoelastic behavior of the pipe walls. These complex phenomena cause strong distortion of the pressure waves traveling through fluids that may...
Article
Full-text available
Accurate monitoring of pressure transients in pipes through a well-developed numerical model is a necessity for design engineers. The simple Method Of Characteristics (MOC) has been the standard method for modeling transients for the last five decades. However, complex phenomena such as unsteady friction cause strong distortion of the pressure wave...
Article
The present investigation is a continuation of a program to study the effects of various parameters on the flow field of a coaxial turbulent jet. In the present study the effect of varying the absolute value of the two initial axial mean velocities of the jet is investigated experimentally, while keeping their ratio constant. The effect of absolute...
Conference Paper
Full-text available
In this study, a numerical model based on the Method of Characteristics (MOC) is developed for modeling pressure transients in viscoelastic pipes. The model is capable of dealing with unsteady friction and viscoelastic behavior of the pipe walls. These complex phenomena cause strong distortion of the pressure waves traveling through fluids that may...
Article
The present study is an experimental investigation of two limiting cases of coaxial turbulent jet namely the round central jet and the annular jet, using Laser Doppler Anemometry. The results of the round jet are presented and discussed for two exit mean velocities. While the annular jet is tested for one exit velocity. The variations along the jet...
Article
The near field-region of the flow field of a coaxial jet configuration is investigated experimentally using Laser Doppler Anemometer. In order to obtain a better definition and, possibly, a deeper physical understanding of the flow field under consideration, the flow was simplified so that the jet is made to issue from concentric round profiled noz...
Article
The present study was performed to investigate experimentally some aspects related to the characteristics of turbulent jet flow using laser Doppler anemometry (LDA) as a measuring technique. It includes the following: (1) investigation of the effect of the velocity bias on the experimental results of the mean and fluctuating velocities, (2) study o...

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Projects

Projects (5)
Project
Experimental and theoretical investigation of Airlift pumps operating in two- and three-phase modes.
Project
Analysis of unsteady flow in pipes