Hamdy A. Kandil

Hamdy A. Kandil
The German University in Cairo (GUC) · Mechatronics Engineering

Ph.D. Old Dominion University VA USA

About

59
Publications
31,677
Reads
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1,257
Citations
Introduction
Current research interest topic is solving the problems of renewable energy such as dust accumulation and over heating. The work includes experimental work and simulation using CFD.
Additional affiliations
July 2013 - December 2014
The German University in Cairo
Position
  • Professor (Associate)
September 2006 - February 2021
The German University in Cairo
Position
  • Professor
February 1995 - October 2018
Alexandria University
Position
  • Professor (Full)
Education
May 1988 - August 1993
Old Dominion University
Field of study
  • Mechanical Engineering
September 1981 - October 1986
Alexandria University
Field of study
  • Mechanical Engineering
September 1976 - April 1981
Alexandria University
Field of study
  • Mechanical Engineering

Publications

Publications (59)
Article
Full-text available
Dust accumulation on Photovoltaic (PV) panels is a severe threat that decreases the energy production of PV panels and therefore, lowers their efficiency especially in the Middle East and North Africa (MENA) region. Cleaning of the PV panels has always been a challenge for most of the countries in this region due to scarcity of water resources and...
Article
Full-text available
This research is concerned with performing computational fluid dynamics (CFD) simulations to investigate the air flow and dust deposition behavior around a ground-mounted solar PV panel. The discrete phase model (DPM) is adopted to model the gas-solid flow. The influence of the wind speed, the dust particle size, and the dust material on the dust d...
Article
This work discusses the numerical investigation of dust deposition behaviour on solar PV panels. Moreover, installing vortex generators (VGs) as a passive cleaning method on the PV panels is introduced and analysed. Multiphase computational fluid dynamics (CFD) simulations are performed to predict the influence of VGs on both the air flow fields an...
Article
Full-text available
This paper presents a comprehensive review regarding the published work related to the effect of dust on the performance of photovoltaic panels in the Middle East and North Africa region as well as the Far East region. The review thoroughly discusses the problem of dust accumulation on the surface of photovoltaic panels and the severity of the prob...
Article
Full-text available
Many types of coatings are available in the market, which prevent the adhesion of dust to the surface of PV panels, but do not repel the dust off the surface of the panel. The objective of this research is to experimentally investigate the influence of using a nano-coating for PV panels together with an automated mechanical vibrator on the electric...
Article
Full-text available
The Fresnel system can achieve high electrical energy yield compared to the traditional photovoltaic (PV) panel techniques due to the concentration of solar energy. However, this huge energy might cause overheating of the PV panel. The objective of this research is to mathematically model a linear Fresnel system that is cooled by either spraying th...
Article
The performance of wind turbines installed in the Middle East and North Africa region is affected by dust accumulation on airfoil surface leading to change in the geometry. The objective of this work is to study the effect of particulate deposition on the aerodynamic performance of wind turbines. Flows past clean and fouled airfoil sections were si...
Article
Full-text available
The aim of this study is to conduct a novel life cycle assessment (LCA) process for a window-mounted building attached photovoltaic panel that is used as a photovoltaic integrated shading (PVIS) device, using GaBi software. Also, the study takes into consideration three different scenarios of the LCA process to reach the most environmentally-friend...
Article
Full-text available
The zero energy building (ZEB) concept mainly depends on the dual-nature of the building attached photovoltaics systems acting as active elements for energy generation as well as shading elements for energy savings. Previous studies have shown that the maximum energy savings occur when the internal heat gains and the internal lightings consumption...
Article
Full-text available
Abstract This paper reports the details of the development of a hydraulic test stand. The hydraulic and control systems of the stand are designed to be used as a multi-functional test rig; it can be used as a teaching unit to recognize the function of the electro-hydraulic system main components, in addition to testing positive displacement pump un...
Article
Full-text available
The Ranque-Hilsch vortex tube is a simple device with no moving parts and no mechanical operations. This tube separates the inlet air into two distinctive regions; an outward high temperature region and an inner low-temperature one. A computational study of the vortex tube is presented in this article using the ANSYS Fluent® software whose results...
Article
Full-text available
A CFD study of the vortex tube is presented in this article using a three-dimensional (3D) model of the tube using ANSYS Fluent®. The 3D analysis of the flow is carried out to have a better visualization of the flow through the tube and to investigate its features. The results showed the existence of two vortices moving in opposite axial directions...
Data
It is observable that two vortices exist inside the RHVT. The direction of the inner vortex with respect to the outer vortex is shown in Figure 4.2. The figure shows that both vortices have the same direction of rotation. The streamlines of inner and outer vortices is presented in this Video.
Book
Full-text available
https://www.morebooks.de/store/gb/book/computational-fluid-dynamics-study-of-the-ranque-hilsch-vortex-tube/isbn/978-3-639-86222-5 https://www.amazon.com/Computational-Fluid-Dynamics-Ranque-Hilsch-Vortex/dp/3639862228 https://www.abebooks.co.uk/9783639862225/Computational-Fluid-Dynamics-Study-Ranque-Hilsch-3639862228/plp
Article
The RanqueeHilsch vortex tube is a simple device with no moving parts and no mechanical operations. This device separates the inlet air into two distinctive regions; an outward high temperature region and an inner low temperature one. A computational study of the tube is presented in this article using an axisymmetric model using the ANSYS Fluent®...
Book
Full-text available
There are many factors that affect the performance of photovoltaic (PV) panels, e.g. (i) dust accumulation on PV panels, and (ii) overheating of the panels. Dust accumulation on PV panels, especially in desert areas, can obscure the solar radiation, and therefore reduce the efficiency of the panels dramatically, as well as heating of PV panels due...
Article
Full-text available
The objective of the research is to minimize the amount of water and electrical energy needed for cooling of the solar panels, especially in hot arid regions, e.g., desert areas in Egypt. A cooling system has been developed based on water spraying of PV panels. A mathematical model has been used to determine when to start cooling of the PV panels a...
Article
In order to economically gain the maximum energy from the wind turbine, the performance of the blade profile must be obtained. In this paper, the results of aerodynamic simulations of the steady low-speed flow past two-dimensional S-series wind-turbine-blade profiles, developed by the National Renewable Energy Laboratory (NREL), are presented. The...
Article
Full-text available
Airfoil data are rarely available for Angles Of Attack (AOA) over the entire range of ±180°. This is unfortunate for the wind turbine designers, because wind turbine airfoils do operate over this entire range. In this paper, an attempt is made to study the lift and drag forces on a wind turbine blade at various sections and the effect of angle of a...
Article
Full-text available
Dynamic stall has been widely known to significantly affect the performance of the wind turbines. In this paper, aerodynamic simulation of the unsteady low-speed flow past two-dimensional wind turbine blade profiles, developed by the National Renewable Energy Laboratory (NREL), will be performed. The aerodynamic simulation will be performed using C...
Conference Paper
Full-text available
Nowadays, Energy has become a very important issue that scientists, governments and even people all around the world are concerning about. Due to the global warming the temperature all around the world is increasing so the number of air conditioners is increasing. To meet this increase in power demand more power have to be generated and this means...
Conference Paper
Full-text available
The objective of this paper is to evaluate the effects of changing different physics schemes on the accuracy of weather simulations at different locations inside Egypt. The model sensitivity to physics options was tested in the four seasons and the results were compared to observations at different locations. Different physics packages were used ba...
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
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
Lake Nasser was created as a result of the construction of the Aswan High Dam in 1968. In 1978 Egypt began building the Sadat Canal NW from Lake Nasser through Toshka valley to allow water levels higher than 178 m to be drained off into Toshka depression. In the late 1990s water began flowing through the Canal into the depression. The lakes were fi...
Conference Paper
Full-text available
The seasonal evaluation of the temperature inversion over Cairo-Egypt is examined for a complete year from September 2004 to September 2005. This area suffers annual episodes, known as “Black Cloud”, resulting from concentration increase of the trapped suspended Particulate Matter (PM) associated with temperature inversion in autumn and spring. The...
Article
Full-text available
Air pollution episodes have been recorded in Cairo, during the fall season, since 1999. The main reason for the smog-like episodes (black clouds) is adverse weather conditions with low and variable winds, high humidity and strong temperature inversions in the few-hundred meters above the ground. The two important types of temperature inversion affe...
Article
Full-text available
An accurate and reliable weather prediction model for Egypt has been made operational at the National Authority for Remote Sensing and Space Sciences (NARSS). To enhance the predictions of such models, remote-sensing observations were integrated in the modeling process such that real-time satellite data are used to initialize, provide boundary cond...
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...
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...
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...
Conference Paper
Full-text available
Wind tunnel experiments were carried out to study the effect of adding a drag-reducing polymer, Sodium Carboxy-methyl-Cellulose (CMC-7H), on the evaporation rate of water droplets. Experiments were carried out in the low subsonic wind tunnel at Alexandria University on a water droplet suspended in a stream of air. The dry bulb temperature ranged be...
Article
Full-text available
An experimental investigation of the performance of an air-lift pump lifting solid particles of different sizes is presented in this paper. Experiments were conducted on sand and coarse, irregular, non-uniform crushed pink limestone particles. The effects of the submergence ratio, size and density of solid particles on the pump performance were stu...
Article
Full-text available
Unsteady, transonic, vortex dominated flow over a 65 deg. sharp-edged, cropped-delta wing of zero thickness undergoing forced rolling oscillations is investigated computationally. The wing angle of attack is 20 deg. and the free stream Mach number and Reynolds number are 0.85 and 3.23 x 10(exp 6), respectively. The initial condition of the flow is...
Article
Existing numerical simulations and physical aspects of subsonic and supersonic vortex-breakdown modes are reviewed. The solution to the problem of supersonic vortex breakdown is emphasized in this paper and carried out with the full Navier—Stokes equations for compressible flows. Numerical simulations of vortex-breakdown modes are presented in boun...
Article
Full-text available
Transonic flow over a 65-deg swept-back, sharp-edged, cropped delta wing is investigated computationally using the time-accurate solution of the unsteady, compressible, full Navier-Stokes equations with an implicit, upwind, flux-difference splitting, finite-volume scheme. Coarse and fine O-H grids are used to obtain the solution. The grid consists...
Article
Full-text available
The effects of freestream Mach number and angle of attack on the leading-edge vortex breakdown due to the terminating shock on a 65-degree, sharp-edged, cropped delta wing are investigated computationally, using the time-accurate solution of the laminar unsteady compressible full Navier-Stokes equations with the implicit upwind flux-difference spli...
Conference Paper
Full-text available
Computational simulation of the vertical tail buffet problem is accomplished using a delta wing-vertical tail configuration. Flow conditions are selected such that the wing primary-vortex cores experience vortex breakdown and the resulting flow interacts with the vertical tail. This multidisciplinary problem is solved successively using three sets...
Article
Full-text available
Three-dimensional supersonic vortex-breakdown problems in bound and unbound domains are solved. The solutions are obtained using the time-accurate integration of the unsteady, compressible, full Navier-Stokes (NS) equations. The computational scheme is an implicit, upwind, flux-difference splitting, finite-volume scheme. Two vortex-breakdown applic...
Article
Full-text available
Computational simulation and study of shock/vortex interaction and vortex-breakdown modes are considered for bound (internal) and unbound (external) flow domains. The problem is formulated using the unsteady, compressible, full Navier-Stokes (NS) equations which are solved using an implicit, flux-difference splitting, finite-volume scheme. For the...
Article
Full-text available
The unsteady, compressible, full Navier-Stokes (NS) equations are used to study the critical effects of the downstream boundary conditions on the supersonic vortex breakdown. The present study is applied to two supersonic vortex breakdown cases. In the first case, quasi-axisymmetric supersonic swirling flow is considered in a configured circular du...
Article
Analysis and computation of steady, compressible, quasi-axisymmetric flow of an isolated, slender vortex are considered. The compressible Navier-Stokes equations are reduced to a simpler set by using the slenderness and quasi-axisymmetry assumptions. The resulting set along with a compatibility equation are transformed from the diverging physical d...
Article
Full-text available
The unsteady, compressible thin-layer and full Navier-Stokes equations are used to numerically simulate steady and unsteady asymmetric, supersonic, locally-conical flows around a 5-deg-semiapex angle circular cone. The main computational scheme used for the present computations is the implicit, upwind, flux-difference splitting, finite-volume schem...
Article
Full-text available
An extensive computational study of supersonic quasi-axisymmetric vortex breakdown in a configured circular duct is presented. The unsteady, compressible, full Navier-Stokes (NS) equations are used for the present computational study. The NS equations are solved for quasi-axisymmetric flow using an implicit, upwind, flux-difference splitting, finit...
Article
Full-text available
The unsteady, compressible Navier-Stokes equations are used to compute and analyze compressible quasi-axisymmetric isolated vortices. The Navier-Stokes equations are solved using an implicit, upwind, flux-difference splitting finite-volume scheme. The developed three-dimensional solver has been verified by comparing its solution profiles with those...
Article
Full-text available
The unsteady, compressible, thin-layer and full Navier-Stokes equations are used to numerically simulate steady and unsteady asymmetric, supersonic, locally conical flows around a 5-deg semiapex angle circular cone. The main computational scheme is the implicit, upwind, flux-difference splitting, finite-volume scheme. Comparison of asymmetric flow...
Article
Full-text available
Thesis (Ph. D.)--Old Dominion University, 1993. Includes bibliographical references.

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