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Article
Thermal Characteristics Of Ceramic Packed Bed

Author: Raghad H. Hilal
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2008 Volume: 26 Issue: 5 Pages: 544-551
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Convection heat transfer in horizontal channel filled with saturated packedbed has been studied numerically using finite difference technique. The channelwall is heated at constant heat flux and packed with a fluid – saturated sphericalceramic for diameter ratio (0.287). Air , helium and carbon dioxide are used asworking fluid at Reynold number ranging (100 – 2500). The results show asignificant effect of varying prandtle number on heat transfer rate and frictionfactor at different Reynold number. The radial temperature profile increase as theprandtle number decrease. The heat transfer rate increase as the prandtle numberincrease , Carbon dioxide is greater than for air and the last is greater than that forhelium at the same flow conditions . Friction factor proportional inversely withprandtl number. New Correlations are obtained in this work:Nuav = 24.548 Re0.238 Pr0.0787F = 39.1917 (d Re1−φ)0.901

يتضمن البحث دراسة نظرية لانتقال الحرارة خلال قناة افقية مملؤة بوسط مساميمشبع ، استخدمت طريق الفروقات المحددة لحل معادلات الطاقة والزخم عدديا . تم تسخين جدارالقناة بفيض حراري ثابت ويتكون الوسط المسامي المشبع من كرات سيراميكية ونسبة قطرمقدارها ( 0.287 ) . استخدم ثاني اوكسيد الكاربون ، الهواء والهليوم كمائع100-2500 ). تبين النتائج تأثير ملحوظ لرقم )(Re) ناقل للحرارة لمديات رقم ريتولدزعلى مقدار الحرارة المنتقلة وكذلك معامل الاحتكاك عند ارقام رينولدز المختلفة . (Pr) برانتلتزداد درجة الحرارة القطرية مع نقصان رقم برانتل اما مقدار كمية الحرارة المنتقلة فتزداد معزيادة رقم برانتل فتكون عند استخدام ثاني اوكسيد الكاربون اكبر من الهواء والهواء اكبر منالهليوم عند نفس ظروف التشغيل . يتناسب معامل الاحتكاك عكسيا مع زيادة رقم برانتل . تمالحصول على العلاقات التالية من النتائج المستحصلة من التحليل النظري :Nuav = 25.548 Re0.238 Pr0.0787F = 39.1917 (d Re1−φ)0.901


Article
Preparation, Characterization and Utilization of Polyacrylamid-Kaolin Composite in the Removal of Nickel Ions From Water

Authors: Mahmood M. Barbooti --- Raghad H. Hilal --- Balkees D. Al-Dabbagh
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 1 Part (C) Pages: 86-93
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

A composite material of polymeric matrix Polyacrylamid (PAM) thatis reinforced by a certified clay mineral of the Iraqi kaolinite at several weightratios (10, 20, 30, 40 and 50%) was prepared by mixing the polymer watersolution with the clay followed by hand molding method. Some of themechanical properties of the prepared composite such as tensile strength,impact and hardness Shore A were studied to improve the mechanicalcapability to be as a sorbent for the removal of heavy metals from water.Theresults showed an improvement in the mechanical properties as the kaolincontent was increased. The powdered material was evaluated as a sorbent fornickel ions from aqueous solution using batch conditions. Experimental design(Box- Wilson) system was applied to determine the optimum workingconditions such as composite amount, pH and contact time. Results provedreasonable adsorption efficiency and relatively high adsorption capacity of thecomposite towards the Ni ions removal of from water. The optimum conditionswere sorbent amount of 10.0 g/l, pH = 7, and contact time of 100 min

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