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Article
Numerical and Experimental Study of the Performance of Electromagnetic Flowmeter in Annular Flow

Authors: Ihsaan Nadhum Jawaad --- Muneer A. Ismael
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2014 Volume: 14 Issue: 2 Pages: 122-136
Publisher: Basrah University جامعة البصرة

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Abstract

The present numerical and experimental work investigates the performance of electromagnetic flowmeter (EMF) for measuring the flow rate of annular flow. Adaptive finite difference technique is used for the numerical calculations and the experimental work is done by making some modification on an existing electromagnetic flowmeter and its testing rig. The performance of the modified EMF is evaluated using two criteria namely, the flowmeter sensitivity S and the conventional weight function non uniformity ε. These two criteria were checked against two parameters; thickness of flowing water (δ) and the electrodes angular position (θe). Experimentally, three different water thickness (δ/Ro = 0.216, 0.373, 0.218) and three electrode position (θe=0o, 11.25o, 45o) were studied. The theoretical and experimental results have showed that these devices work properly in the annular flow case, where the most suitable electrode position in the annular flow was found to be in the conventional position (θe =0o).


Article
OIL-WATER ANNULAR TWO-PHASE FLOW IN HORIZONTAL PIPE
الجريان ثنائي الطور (زيت-ماء) خلال الانابيب الحلقية الافقية

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Abstract

The objective of this work is to gain insight into liquid-liquid annular flow, two-component Iraqi gasoil-water flow lengths in horizontal circular transparent pipe of 32mm inner diameter and 6m length, experiments done at atmospheric condition with oil and water as the working fluids. The flow patterns that appear are classified in flow pattern maps as functions of either mixture velocity and water cut or superficial velocities. The superficial water velocity ranged from 1.69 m/s to 3.38 ms with superficial oil velocity around 0.39 m/s to 1.58 ms. The effects of superficial water velocity, superficial oil velocity on annular flow lengths were taken into account. However, the essentials of the problem involve the determination of the pressure gradient. In this experimental work a video camera "high speed camera" system with image processing technique by MATLAB were used to extract the hold up for the fluid that being the annular flow. The theoretical study was executed using fluent program, a modified turbulent diffusion model is adopted. Simulation results show more physical predictions with respect to the particle deposition process and concentration profile. New data for hold up lengths were found which achieved good agreements with the previous works.

الهدف من العمل الحالي هو تسليط الضوء على دراسة جريان ثنائي الطور لجريان حلقي لمائعين سائل-سائل في انبوب أفقي شفاف بقطر داخلي 32ملم وطول 6 م, لقد أجريت التجارب تحت الظروف البيئيه الطبيعيه في المختبر باستخدام كلا المائعين كطورين سائلين. نماذج الجريان تظهر مصنفه كخريطة توضيح أنواع الجريان وتكون كمعادله لسرعة الخليط .معدل سرعة الماء يتراوح من 1.69 م/ثانيه الى 3.38 م/ثانيه ومعدل سرعة النفط يتراوح من 0.39 م/ثانيه الى 1.58 م/ثانيه. تم استخدام نظام تصويري باستخدام كاميرا عاليه السرعة وذات مواصفات تصويرية عاليه الدقه مع تقنية معالجة الصور بواسطة MATLAP والهدف هو الحصول على نظرة ثاقبة السائل-السائل تدفق ألحلقي. تم تنفيذ الدراسة النظرية باستخدام برنامج فلونت CFD، و اعتماد نموذج الانتشار المضطرب المحسن. نتائج المحاكاة تظهر التوقعات الفعلية أكثر فيما يخص عملية ترسب الجسيمات والتركيز. تم العثور على بيانات جديدة تتوافق مع ما أوجده الباحثون سابقا.

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