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Article
Prevention of Scale Formation in Heat Exchanger Pipesby Using Magnetic Field

Authors: Jassim M. Al-Kyayyat --- Abbas H. Sulaymon عباس حميد
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2007 Volume: 8 Issue: 4 Pages: 39-44
Publisher: Baghdad University جامعة بغداد

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Abstract

The possibility of using the magnetic field technique in prevention of forming scales in heat exchangers pipes using hard water in heat transfer processes, also the studying the effective and controllable parameters on the mechanism of scale formation.The new designed heat exchanger experimental system was used after carrying out the basic process designs of the system. This system was used to study the effect of the temperature (40-90 °C) and water flow rate (0.6-1.2 L/min) on the total hardness with time as a function of precipitation of hardness salts from water and scale formation.Different magnetic field designs in the heat exchanger experimental system were used to study the effect of magnetic field design and strength (200-500 Gauss) on the total hardness with time as a function of precipitation of hardness saltsfrom water and scale formation.


Article
Natural Convection from Single Finned Tube Immerrsed in a Tilted Enclosure

Authors: Hadi R. Roomi --- Ikhlase M. Fayed
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2007 Volume: 13 Issue: 3 Pages: 1585-1600
Publisher: Baghdad University جامعة بغداد

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Abstract

Heat transfer rates of a single horizontal finned tube immersed in water –filled enclosure tilted at 30 degrees are measured .The results serve as a baseline case for a solar water heating system with a heat exchanger immersed in integral collector storage. Tests were made with both adiabatic and uniform heat flux boundary conditions. Natural convection flow in enclosure is interpreted from measured water temperature distributions. Formation of an appropriate temperature difference that drives natural convection is determined .Correlations for the overall heat transfer coefficient in terms of the Nusselt and Rayleigh numbers are reduced to the form Nu = 0.716 Ra^0.247for 2*10^5 <= Ra <= 2*10^7 Based on the diameter of the immersed tube .Comparison the present work results with others gave a good agreement.

قيس معدل انتقال الحرارة من أنبوب منفرد مغمور في ماء داخل مغلف . المغلف مائل عن الأفق بزاوية º 30 . ممكن تمثيل النتائج لمنظومة تسخين بالطاقة الشمسية لمبادل حراري مغمور في مجمع الطاقة الشمسية أجريت الاختبارات لحالة العزل الحراري من جميع الجهات بوجود شروط حدية بثبوت درجة حرارة المائع مرة والحالة الثانية العزل الحراري من جميع الجهات ما عدا السطح العلوي إذ يتعرض لثبوت الفيض الحراري ممكن تمثيل جريان انتقال الحرارة بالحمل الحر داخل المغلف من خلال قياس درجات الحرارة داخله . العلاقة التجريبية لانتقال الحرارة بالحمل الحر ممكن تمثيلها بدلالة عدد نسلت ورقم رايلي من خلال العلاقة التجريبية التالية:Nu=0.716Ra^0.247 for 2×10^5<=Ra<=2×10^7قيست العلاقة على أساس قطر الأنبوب المغمور. قورنت نتائج البحث الحالي مع بحوث سابقة وحصل على توافق جيد.

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