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Aerodynamic Parameters Analysis of Transonic Flow Past Unswept and Swept Wings
تحليل عوامل الأيروديناميكية لجريان حول صوتي على الأجنحة المتراجعة والمستقيمة

Author: Raad Shehab Ahmed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 5 Pages: 948-960
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The transonic flow past unswept and swept wings has been studied. For thispurpose the transonic potential flow equation is solved for inviscid compressible flow.The shock waves are replaced by discontinuities across which the entropy isconserved. The velocity field and pressure coefficients are estimated as function offree stream Mach number. The results show the effect of free stream Mach number onshock waves location and the velocity field around the wing section. The Eulersolution and potential flow solutions are identical at subsonic flow; however, atsupersonic flow the potential theory can no longer predict the flow field correctly. Theresults show the important effect of sweep angle on the value of the critical Machnumber for wings. By using Visual foil plus the pressure distribution and liftcoefficient and Mach contours for flow Past a NACA 0012 airfoil can be predicted.


Article
Natural Convection Heat Transfer In an Inclined Circular Cylinder

Authors: Raad Shehab Ahmed --- Mahmoud A. Mashkour --- Akeel A. Mohammed
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2011 Volume: 17 Issue: 4 Pages: 659-673
Publisher: Baghdad University جامعة بغداد

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Abstract

Experiments were carried out to investigate natural convection heat transfer in an inclined uniformly heated circular cylinder . The effects of surface heat flux and angle of inclination on the temperature and local Nusselt number variations along the cylinder surface are discussed . The investigation covers heat flux range from 92 W/m² to 487 W/m², and angles of inclination 0° ( horizontal) , 30° , 60° and 90° (vertical) . Results show an increase in the natural convection as heat flux increases and as angle of inclination moves from vertical to horizontal position. An empirical equation of average Nusselt number as a function of Rayliegh number was deduced for each angle of inclination.

أجريت تجارب لدراسة عملية انتقال الحرارة بالحمل الحر في أسطوانة دائرية مائلة مسخنة تسخين منتظم. تم مناقشة تأثيرات الفيض الحراري للسطح وزاوية الميل على تغيرات درجة الحرارة و رقم نسلت الموقعي خلال سطح الأسطوانة. غطت الدراسة مدى الفيض الحراري من ( 92 الى 487) واط/متر مربع و زوايا ميل 0° (افقي)، 30°،60° ، و90° (عمودي) . بينت النتائج بأن الحمل الحر يزداد كلما زاد الفيض الحراري و كلما تغيرت زاوية الميل من الوضع العمودي إلى الوضع الأفقي. تم استنباط معادلة تجريبية لمعدل رقم نسلت كدالة لرقم رايلي لكل زاوية ميل.

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