Faculty Book Chapters

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  Numerical modelling of slot film cooling using a wall function

  Karim M. Shalash, Lamyaa A. El-Gabry, and Mohamed M.Abo El-Azm

  CFD modeling of gas turbine film cooling remains a challenge for the computational arena due to the lack of robust accurate turbulence model or numerical technique to solve this highly complex problem. Modeling the exact behavior of the coolant jet is computationally expensive due to the complexity of the jet mainstream interaction, such as vortex generation, and separation. This paper, validation progress is presented using experimental data executed by the second author [GT2011-46491] and Thurman et-al [GT2011-46498] for blowing ratios of 1.0 and 2.0, and density ratio of 1.0. A wall function approach is chosen for a robust computation, and aiming for CPU time reduction. The in-house CFD code EOS is used to solve the RANS equations. A simple flow over flat plate validation problem was executed using experimental data of Klebanoff and El-Tahry as a code validation evidence. The computational results of the flow field were in agreement with the experimental measurements, with a slight over estimation of the thermal field due to over prediction of dissipation, resulting in less diffusion and mixing between the coolant jet and the mainstream. The wall function approach is shown to have great potentials for a robust accurate solution. The use of the continuous slot injection is known to be the best film cooling technique when compared to the other conventional circular coolant tubes, with the critical drawback of lowering the mechanical integrity of the blade. One way to overcome this problem is the use of discrete slots, which will optimize for better film cooling effectiveness, while maintaining the structural strength of the blade. Rectangular slots showed an increase in film cooling effectiveness for the same mass flow rate of coolant and blowing ratio when compared to the standard circular hole, which is due to the minor counter rotating vortex pair effect. An oval slot design showed higher film cooling effectiveness and more spreading, covering more surface area. Copyright © 2013 by ASME.

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  Experimental Investigations of CO2 Solubility and Variations in Petrophysical Properties due to CO2 Storage in Carbonate Reservoir Rocks

  Shedid A. Shedid and Adel M. Salem

  [abstract not available]

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  Finish materials of hospital operating rooms of the usa and egypt: Selection and actual performance-in-use

  Ahmed H. Sherif

  The materials selected in finishing the surfaces of operating rooms can have an effect on performance. They must be suitable and supportive to the functions of these specialized spaces. Also, they must withstand the various demands resulting from the intensive use. This is especially important with the strict aseptic techniques that are typically observed in these spaces. This can also result in increased hospital operation and maintenance costs. This paper reports on the results of two surveys on the finish materials used in the floor, walls and ceiling surfaces of operating rooms. The study covered more than 546 operating rooms in more than 86 hospitals. The first survey was conducted for hospitals built -or renovated in the USA between 1980 and 2003. The second survey was conducted in Egypt for hospitals built, renovated, or under design between 2008 and 2012. The time difference between the two surveys was of little concern, since the performance of finish materials does not become apparent except after long term use that extends for years. The surveys identified the materials that were most commonly used in finishing the operating rooms in both countries. Also, views of the facility managers of the USA hospitals in regards to the actual performance of these materials were collected. These were compared with previous studies in Egypt and the USA. The paper draws useful conclusions to architects, administrators and facility managers on the most popular finish materials used in these specialized spaces. Also, views of the facility managers on the performance-in-use of these materials were identified. This included performance of the most popular materials in regards to their sterile properties, durability, maintenance, aesthetics, comfort, safety and cost. © 2013 American Society of Civil Engineers.

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  Tension of legacy: Self-authorship of female engineering students and their professional choice

  Jennifer A. Skaggs

  [no abstract provided]

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  Mining cloud environments usage data

  Karim Sobh, Ahmed Rafea, and Amr El-Kadi

  [abstract not available]

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  Novel wire-grid nantenna array for optical communication systems

  Ezzeldin A. Soliman, Mai O. Sallam, and Guy A.E. Vandenbosch

  [abstract not available]

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  A spatial incremental relaying-based user transparent ARQ protocol

  Radwa A. Sultan and Karim G. Seddik

  [abstract not available]

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  Measurements of giant second harmonic generation from vertically aligned silicon nanowires

  M. A. Swillam, M. Khorasaninjead, and S. S. Saini

  [abstract not available]

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  Equivalent circuit model for plasmoinc slot waveguides networks

  Mohamed A. Swillam, Charles Lin, and Amr S. Helmy

  [abstract not available]

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  A general approach for automating outliers identification in categorical data

  Ayman Taha and Ali S. Hadi

  [abstract not available]

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  Le Gallienne’s Paraphrase and the limits of translation

  Adam Talib

  This essay shows that Richard Le Gallienne’s 1897 edition of the Rubáiyát of Omar Khayyám is an original literary text and that it, along with other versions of the Rubáiyát published in the same period, was a response to FitzGerald’s wildly popular translation of a few decades earlier. Le Gallienne’s paraphrased versions of Persian poetry, Khayyam and later Hafez, are linked to his close involvement with the commercial publishing industry while his primary reliance in these paraphrases on academic translations highlights the parallel trend of scholarly reaction, often corrective, to FitzGerald’s edition. By examining how Le Gallienne composed his paraphrase and how he crafted an original work of literature, this essay helps us better understand the extent to which the Rubáiyát quickly ceased to be regarded as an original Persian literary artefact and was adopted as a constellation of literary tropes with which English literature could engage unreservedly. Le Gallienne’s Rubáiyát has been mistaken for a genuine translation and been derided as such, but this essay demonstrates that when seen as an original, and opportunistic, work of literature, it helps us to understand the contemporary tensions surrounding academic and commercial translation and the place of the Rubáiyát in English literary history.

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  Topoi and Topography in the Histories of al-Ḥīra

  Adam Talib

  This chapter examines the Arabic poetry dealing with the city of Ḥīra in south-west Iraq. Much of this poetry is filled with longing for a fleeting era of glory, when Ḥīra was ruled by its Christian kings. The chapter suggests that much of this material had its origins in the Ḥīra court itself. When this poetic tradition was inherited by Muslim Arabs, it caused them to view the Islamic conquests as a time of loss, as well as victory, and it acted as a reminder of the temporary nature of all political authority

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  Plasmonic slot waveguides with core nonlinearity

  Sherif A. Tawfik and Mohamed A. Swillam

  [abstract not available]

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  Statistical static timing analysis of conditional asynchronous circuits using model-based simulation

  Eslam Yahya, Laurent Fesquet, Yehea Ismail, and Marc Renaudin

  [abstract not available]

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  Modeling pipeline projects using computer simulation

  Hany Zahran and Khaled Nassar

  Due to The increasing demand on fossil fuel, Pipelines have become an essential element in today's world economy. Thus, any delays in pipeline construction projects have become highly intolerable. The construction process has many activities that involve various resources and each activity relies strongly on its predecessors. This paper presents a tool for planning pipelines projects using computer simulation. The proposed tool aids contractors in planning pipelines projects by estimating their associated time and cost of construction. The tool breaks down pipeline projects into a number of activities along with their resources. An application example is presented to demonstrate the features of the proposed tool. © 2013 IEEE.

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  Particle swarm optimization for the identification of worst case test vectors of total-dose induced leakage current failures in ASICs

  M. M. Abdel-Aziz, H. A. Abdel-Aziz, A. A. Abou-Auf, and A. G. Wassal

  [abstract not available]

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  Is there a computational advantage to representing evaporation rate in ant colony optimization as a gaussian random variable?

  Ashraf M. Abdelbar

  We propose an ACO (Ant Colony Optimization) variation in which the evaporation rate, instead of being constant as is common in standard ACO algorithms, is a Gaussian random variable with non-negligible variance. In experimental results in the context of MAX-MIN Ant System (MMAS) and the Traveling Salesman Problem (TSP), we find that our variation performs considerably better than MMAS when the number of iterations is small, and that its performance is slightly better than MMAS when the number of iterations is large. © 2012 ACM.

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  Modeling the response of Bang-Bang digital PLLs to phase error perturbations

  Moataz Abdelfattah, Maged Ghoneima, Yehea I. Ismail, Amr Lotfy, and Mohamed Abdel-Moneum

  [abstract not available]

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  A novel digital loop filter architecture for bang-bang ADPLL

  Moataz Abdelfattah, Maged Ghoneima, Yehea I. Ismail, Amr Lotfy, and Mohamed Abdelsalam

  [abstract not available]

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  Efficient sensitivity analysis of optical structures using finite element method

  Mohamed R. Abdelhafez and Mohamed A. Swillam

  [abstract not available]

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  On the effect of interference on Wi-Fi-based wireless networked control systems

  E. E. Abdel Reheem, Y. I. El Faramawy, H. H. Halawa, M. A. Ibrahim, and A. Elhamy

  [abstract not available]

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  A new sensor distribution for different applications and lifetime elongation techniques

  M. Abdelsalam, N. A. Ali, H. M. El-Sayed, H. H. Amer, and R. M. Daoud

  [abstract not available]

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  DC testing of switched capacitor based delta sigma converters

  O. S. Ahmed, M. B. Abdelhalim, A. H. Madian, and H. H. Amer

  [abstract not available]

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  Efficient sensitivity analysis of photonic structures with transmission line modeling

  Osman S. Ahmed, Mohamed H. Bakr, Mohamed A. Swillam, and Xun Li

  [abstract not available]

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  A local-diffusion genetic algorithm for disjoint pareto-optimal problems with application to vehicle suspension

  Mohamed F. Aly, Ashraf O. Nassef, and Karim Hamza

  [abstract not available]