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Détail de l'auteur
Auteur A. Abouel-Kasem
Documents disponibles écrits par cet auteur
Affiner la rechercheBubble structures between two walls in ultrasonic cavitation erosion / A. Abouel-Kasem in Transactions of the ASME . Journal of tribology, Vol. 134 N° 2 (Avril 2012)
in Transactions of the ASME . Journal of tribology > Vol. 134 N° 2 (Avril 2012) . - 09 p.
Titre : Bubble structures between two walls in ultrasonic cavitation erosion Type de document : texte imprimé Auteurs : A. Abouel-Kasem, Auteur ; S. M. Ahmed, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : tribology Langues : Anglais (eng) Mots-clés : cavitation erosion; high speed imaging; bubble structures; AL-99 999; fatigue Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The cavitation bubble structures for the stationary specimen method were clarified for various distances, h, between the stationary specimen and the horn-tip surface. The generated cavitation bubbles constituted a huge number of tiny bubbles and bubble clusters of different sizes. The maximum cluster size was 1.4 mm. The observed cavitation patterns systematically changed during tests from the subcavitating state to the supercavitating state with respect to the separation distance, h. For h <4 mm, the bubbles have a definite trajectory, and the pressure patterns manifest a circular shape as a result of streaming induced by ultrasonic cavitation. The feature morphology of the eroded surfaces revealed that the predominant failure mode was fatigue. In the light of the material failure features and the cavitation patterns, it is also deduced that the important mechanism to transfer the cavitation energy to the solid is shock pressures accompanied by collapsing clusters. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000002 [...] [article] Bubble structures between two walls in ultrasonic cavitation erosion [texte imprimé] / A. Abouel-Kasem, Auteur ; S. M. Ahmed, Auteur . - 2012 . - 09 p.
tribology
Langues : Anglais (eng)
in Transactions of the ASME . Journal of tribology > Vol. 134 N° 2 (Avril 2012) . - 09 p.
Mots-clés : cavitation erosion; high speed imaging; bubble structures; AL-99 999; fatigue Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The cavitation bubble structures for the stationary specimen method were clarified for various distances, h, between the stationary specimen and the horn-tip surface. The generated cavitation bubbles constituted a huge number of tiny bubbles and bubble clusters of different sizes. The maximum cluster size was 1.4 mm. The observed cavitation patterns systematically changed during tests from the subcavitating state to the supercavitating state with respect to the separation distance, h. For h <4 mm, the bubbles have a definite trajectory, and the pressure patterns manifest a circular shape as a result of streaming induced by ultrasonic cavitation. The feature morphology of the eroded surfaces revealed that the predominant failure mode was fatigue. In the light of the material failure features and the cavitation patterns, it is also deduced that the important mechanism to transfer the cavitation energy to the solid is shock pressures accompanied by collapsing clusters. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000002 [...]
in Transactions of the ASME . Journal of tribology > Vol. 130 n°3 (Juillet 2008) . - 6 p.
Titre : Cavitation erosion mechanism based on analysis of erosion particles Type de document : texte imprimé Auteurs : A. Abouel-Kasem, Auteur ; S. M. Ahmed, Auteur Année de publication : 2008 Article en page(s) : 6 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Particulate matter Cavitation erosion Erosion Mechanisms Fatigue Résumé : The mechanism of cavitation erosion is investigated in detail through observations of the removed particles from pure aluminum (Al-99.999). The particles removed during the incubation stage have distinctive characteristics compared to those removed in the subsequent stages. These characteristics are distinguished by lamellae structure, foldness, waviness, large size as well as one of the particle surfaces appeared to be part of the original face of the specimen. Therefore, these characteristics can be used as a monitor for early detection of cavitation erosion in closed systems. Systematic observations of disloged particles and eroded surface morphology show that the dominant failure mode in cavitation erosion is fatigue. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468069 [article] Cavitation erosion mechanism based on analysis of erosion particles [texte imprimé] / A. Abouel-Kasem, Auteur ; S. M. Ahmed, Auteur . - 2008 . - 6 p.
Tribology
Langues : Anglais (eng)
in Transactions of the ASME . Journal of tribology > Vol. 130 n°3 (Juillet 2008) . - 6 p.
Mots-clés : Particulate matter Cavitation erosion Erosion Mechanisms Fatigue Résumé : The mechanism of cavitation erosion is investigated in detail through observations of the removed particles from pure aluminum (Al-99.999). The particles removed during the incubation stage have distinctive characteristics compared to those removed in the subsequent stages. These characteristics are distinguished by lamellae structure, foldness, waviness, large size as well as one of the particle surfaces appeared to be part of the original face of the specimen. Therefore, these characteristics can be used as a monitor for early detection of cavitation erosion in closed systems. Systematic observations of disloged particles and eroded surface morphology show that the dominant failure mode in cavitation erosion is fatigue. En ligne : http://tribology.asmedigitalcollection.asme.org/article.aspx?articleID=1468069
in Transactions of the ASME . Journal of tribology > Vol. 132 N° 2 (Avril 2010) . - 10 p.
Titre : Design and performance of slurry erosion tester Type de document : texte imprimé Auteurs : A. Abouel-Kasem, Auteur ; Y. M. Abd-Elrhman, Auteur ; K. M. Emara, Auteur Année de publication : 2011 Article en page(s) : 10 p. Note générale : Tribology Langues : Anglais (eng) Mots-clés : Impact (mechanical) Wear testing Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A slurry whirling arm erosion test ring was constructed and a series of erosion tests and post-erosion analysis were carried out using a paint erosion indication technique. The pattern of the paint removal presented a highly visual and accelerated map for the erosion process and its behavior. Also, the erosion rate of paint removal was investigated under a number of erosion variables. It was observed that the rebounding of the erodent particles from the sample surface play an important role in developing erosion for this tester. The erosion pattern showed that the effect of the rebound particles depends on the impact velocity and impingement angle. It was also observed that the erosion behavior of paint as a function of impingement angle, impact velocity, and erosion time was similar to that reported in literature for engineering materials. The slurry whirling arm erosion tester seems to be promising for simulating the slurry process in real cases. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Design and performance of slurry erosion tester [texte imprimé] / A. Abouel-Kasem, Auteur ; Y. M. Abd-Elrhman, Auteur ; K. M. Emara, Auteur . - 2011 . - 10 p.
Tribology
Langues : Anglais (eng)
in Transactions of the ASME . Journal of tribology > Vol. 132 N° 2 (Avril 2010) . - 10 p.
Mots-clés : Impact (mechanical) Wear testing Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A slurry whirling arm erosion test ring was constructed and a series of erosion tests and post-erosion analysis were carried out using a paint erosion indication technique. The pattern of the paint removal presented a highly visual and accelerated map for the erosion process and its behavior. Also, the erosion rate of paint removal was investigated under a number of erosion variables. It was observed that the rebounding of the erodent particles from the sample surface play an important role in developing erosion for this tester. The erosion pattern showed that the effect of the rebound particles depends on the impact velocity and impingement angle. It was also observed that the erosion behavior of paint as a function of impingement angle, impact velocity, and erosion time was similar to that reported in literature for engineering materials. The slurry whirling arm erosion tester seems to be promising for simulating the slurry process in real cases. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]
in Transactions of the ASME . Journal of tribology > Vol. 133 N° 4 (Octobre 2011) . - 09 p.
Titre : Fractal analysis of cavitation eroded surface in dilute emulsions Type de document : texte imprimé Auteurs : A. Abouel-Kasem, Auteur ; F. A. Alturki, Auteur ; S. M. Ahmed, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : Triboblogy Langues : Anglais (eng) Mots-clés : Emulsions Fractals Fracture Stainless steel Water Wear Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In the present work, the topographical images of cavitation erosion surfaces at water and oil-in-water (o/w) emulsions were quantified using fractal analysis. The oil-in-water emulsion concentrations were 2, 5 and 10 wt. %, which are in the popular range used in hydraulic systems. The study showed that the variation of fractal dimension calculated from slope of linearized power spectral density for water and o/w emulsions can be used to characterize the cavitation intensity in similar manner to the weight loss. Both the fractal dimension and the weight loss decrease with adding oil to water. It was also found that the variation of fractal dimension versus concentration of oil-in-water emulsions has a general trend that does not depend on magnification factor. The cavitation erosion behavior and mechanism for water and o/w emulsions has been studied. It was found that the predominant failure mode was fatigue for water and o/w emulsions. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Fractal analysis of cavitation eroded surface in dilute emulsions [texte imprimé] / A. Abouel-Kasem, Auteur ; F. A. Alturki, Auteur ; S. M. Ahmed, Auteur . - 2012 . - 09 p.
Triboblogy
Langues : Anglais (eng)
in Transactions of the ASME . Journal of tribology > Vol. 133 N° 4 (Octobre 2011) . - 09 p.
Mots-clés : Emulsions Fractals Fracture Stainless steel Water Wear Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In the present work, the topographical images of cavitation erosion surfaces at water and oil-in-water (o/w) emulsions were quantified using fractal analysis. The oil-in-water emulsion concentrations were 2, 5 and 10 wt. %, which are in the popular range used in hydraulic systems. The study showed that the variation of fractal dimension calculated from slope of linearized power spectral density for water and o/w emulsions can be used to characterize the cavitation intensity in similar manner to the weight loss. Both the fractal dimension and the weight loss decrease with adding oil to water. It was also found that the variation of fractal dimension versus concentration of oil-in-water emulsions has a general trend that does not depend on magnification factor. The cavitation erosion behavior and mechanism for water and o/w emulsions has been studied. It was found that the predominant failure mode was fatigue for water and o/w emulsions. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]
in Transactions of the ASME . Journal of tribology > Vol. 132 N° 4 (Octobre 2010)
Titre : Investigation of temperature effects on cavitation erosion behavior based on analysis of erosion particles Type de document : texte imprimé Auteurs : B. Saleh, Auteur ; A. Abouel-Kasem, Auteur ; A. Ezz El-Deen, Auteur Année de publication : 2011 Note générale : Tribology Langues : Anglais (eng) Mots-clés : Aluminium Fatigue Particle size Scanning electron microscopy Wear Wear testing Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The effect of temperature on the wear particles produced by vibratory cavitation erosion tests on Al-99.92 in distilled water was analyzed. Scanning electron microscope images of wear particles were obtained, forming a database for further analysis. This study showed that the variation of average particle size with temperature was very much similar to the variation of weight loss with temperature. The average particle size was maximum at 40°C. It was also observed that the average particle size was time dependent. The particle's morphology features revealed that the predominant erosion mechanism was fatigue failure, irrespective of the temperature. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...] [article] Investigation of temperature effects on cavitation erosion behavior based on analysis of erosion particles [texte imprimé] / B. Saleh, Auteur ; A. Abouel-Kasem, Auteur ; A. Ezz El-Deen, Auteur . - 2011.
Tribology
Langues : Anglais (eng)
in Transactions of the ASME . Journal of tribology > Vol. 132 N° 4 (Octobre 2010)
Mots-clés : Aluminium Fatigue Particle size Scanning electron microscopy Wear Wear testing Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The effect of temperature on the wear particles produced by vibratory cavitation erosion tests on Al-99.92 in distilled water was analyzed. Scanning electron microscope images of wear particles were obtained, forming a database for further analysis. This study showed that the variation of average particle size with temperature was very much similar to the variation of weight loss with temperature. The average particle size was maximum at 40°C. It was also observed that the average particle size was time dependent. The particle's morphology features revealed that the predominant erosion mechanism was fatigue failure, irrespective of the temperature. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE900013 [...]
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