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Faculty of Engineering & Technology
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Mohamed A. Karali

Basic information

Name : Mohamed A. Karali
Title: Lecturer
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Personal Info: Dr. Eng. Mohamed A. Karali (د.م. محمد أحمد قرعلى) is an Assistant Professor at the Mechanical Engineering Department, Faculty of Engineering and Technology, Future University in Egypt (FUE), specializing in Mechanical Power Engineering. Dr. Karali received his Ph.D. degree from the Institute of Fluid Dynamics and Thermodynamics, Otto von Geuricke University Magdeburg, Germany in 2015. He had received his Bachelor of Science and Masters in Mechanical Engineering in 2001 and 2007, respectively, from the Faculty of Engineering El-Mataria, Helwan University in Cairo, Egypt. Recently, his research area interested in image processing techniques and its applications in rotary drums studies and renewable energies. View More...

Education

Certificate Major University Year
PhD . Otto Von Guericke University faculty of Engineering 2015
Masters Mechanical Power Engineering Helwan - Egypt 2007
Bachelor Mechanical Power Engineering Helwan - Egypt 2001

Teaching Experience

Name of Organization Position From Date To Date
Faculty of Engineering and Technology, Future University, Cairo, Egypt. Assistant Professor 01/01/2015 01/01/2017
Institut für Str?mungstechnik und Thermodynamik ISUT, Fakult?t für Verfahrens- und Systemtechnik, Otto-von-Guericke-Universit?t Magdeburg, Germany. PhD researcher and lecturer 01/01/2012 01/01/2015
Faculty of Engineering and Technology, Future University, Cairo, Egypt. Asistant lecturer 01/01/2008 01/01/2012
Faculty of Engineering - Mataria, Helwan University, Cairo, Egypt. Researcher, tutor and trainer 01/01/2002 01/01/2007

Researches /Publications

Granular transport through flighted rotary drums operated at optimum-loading: Mathematical model - 01/0

Mohamed Ahmed Mahmoud Karali

Eckehard Specht, Jochen Mellmann, HA Refaey, MR Salem, AY Elbanhawy

01/02/2019

This paper discusses the transport of granular materials through flighted rotary drums operated at the optimum loading. A mathematical model is derived from the force balance acting on a single traveling particle, to predict the mean residence time of transportation. Based on the available parameters of mean height of falling curtains and final discharge angle, this model can be helpful to estimate the appropriate solid feeding rate. Two steps were followed to implement the use of the model. Firstly, experiments were carried out on a batch rotary drum to obtain the needed input parameters. Then, a case study of a small capacity rotary dryer was considered. In both steps, the drum was operated at the optimum loading. The model results were compared with other correlation from the literature for two cases of solid and air flows: con-current and counter current. Based on the results, a factor is introduced for generalized …

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Unloading characteristics of flights in a flighted rotary drum operated at optimum loading - 01/0

Mohamed Ahmed Mahmoud Karali

, Eckehard Specht, Fabian Herz, Jochen Mellmann, Hassanein A Refaey

01/06/2018

In this contribution, experimental analysis is introduced to determine the unloading characteristics of granular solid from flights. In a flighted rotary drum operated at optimum-loading. The studied unloading characteristics are: kinetic angle of repose of solid reside inside a flight, individual flight holdup, final discharge angle, cascading rate, and height and time of falling curtains. These characteristics are determined as a continuous function of the flight angular position. The tested drum is 0.5 m diameter and 0.15 m length, the rpm changes from 1 to 5, two number of flights 12 and 18, and two flight length ratios 0.375 and 0.75 are researched. Results revealed that: flights holdup is mainly influenced by flight length ratio among other studied parameters. Maximum height of falling curtains can be achieved when operating rotary drums at optimum-loading, since the bottom solid bed is no longer exists compared to over …

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Mathematical model to simulate the heat transfer in vitrified clay pipes kiln - 01/0

Mohamed Ahmed Mahmoud Karali

H. A. Refaey , A. G. Al-Hasnawi and E. Specht

01/04/2018

Carrying out experiments in tunnel kilns are difficult and costly. Due to the large length of such kilns that sometimes reaches 180 meters. That causes the production cycle takes some days. Therefore, a mathematical model is needed to simulate the heat transfer process in such kilns. In this contribution, a simple shape product (vitrified clay pipes) was used in the modeling, in order to simplify the complexity of the process. The bvp4c code was used to solve all ordinary differential equations (ODEs) of the model to obtain temperature profiles of the system using Matlab. Results revealed that: the excess air number has a higher impact on the heat transfer process inside the kiln. Consequently, the thermal heating of products could be easily controlled, by changing the excess air values. Heat transfer coefficient enhancement is a key parameter to save the energy consumption within the kiln.

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Different camera and light positions to facilitate image analysis processing in rotary drums studies - 01/0

Mohamed Ahmed Mahmoud Karali

Eckehard Specht, Fabian Herz, Jochen Mellmann

01/01/2017

This paper represents an extension to our experimental work published previously in Karali et al., Karali et al.(2016). This new experimental work is mainly performed to overcome all the technical problems issued by the previous work like; camera and light positions. In order to facilitate image analysis processing in rotary drums studies. The experiments are aimed at determining the optimum loading of a flighted rotary drum (1.0 m diameter and 0.3 m length). Number of flights of 12 and 18, flight tangential/radial length ...

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Comparison of image analysis methods to determine the optimum loading of flighted rotary drums - 01/0

Mohamed Ahmed Mahmoud Karali

Fabian Herz, Eckehard Specht, Jochen Mellmann

01/04/2016

The loading state of a flighted rotary drum strongly affects its overall performance. Hence, assessing the optimum (design) loading needed is a critical issue. In the present work experiments were carried out to assess the optimum loading of a batch rotary drum (0.5 m diameter and 0.15 m length) furnished with rectangular flights. Different solid materials (free flowing), rotational speeds (from 1 to 5 rpm) and flight tangential/radial length ratios (0.375 and 0.75) were researched. The experimental work mainly relied on recording ...

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Experimental analysis of a flighted rotary drum to assess the optimum loading - 01/1

Mohamed Ahmed Mahmoud Karali

Koteswara Rao Sunkara, Fabian Herz, Eckehard Specht

01/12/2015

The loading state of a rotary drum strongly affects its overall performance. Hence, assessing the optimum (design) loading of the rotary drum is a critical issue. In the present work, a lot of experiments were carried out on a 50 cm diameter and 15 cm length batch rotary drum furnished internally with rectangular flights. Different loadings were examined through image analysis processing of the recorded videos from under-loading to over-loading, including design-loading. Many solid materials (free flowing) with different particle diameters and angles of repose, varied rotational speeds (from 1 to 5 rpm), two numbers of flights (12 and 18), and two flight length ratios (0.375 and 0.75) were researched. A comparison is conducted between the experimental results and some available design loading models from literature. Based on the experimental results a new fitting factor is proposed.

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Experimental determination of the discharge characteristics of a flighted rotary drum operated at optimum loading - 01/0

Mohamed Ahmed Mahmoud Karali

Fabian Herz, Eckehard Specht

01/07/2015

The loading state of a rotary drum strongly affects its overall ‎performance. Hence, assessing the optimum (design) loading of the ‎rotary drum is a critical issue. In the present work, a lot of experiments ‎were carried out on a 500 mm diameter and 150 mm length batch ‎rotary drum designed internally with rectangular flights. Different ‎loadings were examined through image analysis processing of the ‎recorded videos from under loading to over loading, including design ‎loading. free flowing glass beads with different particle diameters and ‎angles of repose, varied rotational speeds (from 1 to 5rpm) and two ‎flight length ratios (0.375 and 0.75) were researched. A comparison is ‎conducted between the experimental results and some available design ‎loading models from literature.‎

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Performane evaluation of a vapor compression refrigeration system using R22 alternatives - 01/0

Mohamed Ahmed Mahmoud Karali

Mohamed A. Karali, M. Fatouh

01/01/2007

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Awards

Award Donor Date
Poster first prize Conference of 5th UK-China and 13th UK Particle Technology Forum, At Leeds University, UK. 2015
Ph.D mission studying FUE 2012
Researcher, Helwan University Egypt 2002

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