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Article
A Mathematical Model to Predict the Liquid Holdup in Vertical Slug Two-Phase Flow in Pipes

Author: Ahmed Saib Naji
Journal: KUFA JOURNAL OF ENGINEERING مجلة الكوفة الهندسية ISSN: 25230018 Year: 2010 Volume: 1 Issue: 2 Pages: 45-59
Publisher: University of Kufa جامعة الكوفة

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Abstract

In the present work, a model to predict the liquid holdup in slug, two-phase gas-liquid, upwardly flow has been developed. This model has compared with nine published methods by using experimental tests for two types of flow systems available in the literature. The comparison achieved using the relative performance factor (FPR) which is representing an equivalent result of the most statistical tools as: error, average error and standard deviation. The results showed the best performance of the present model than the others for each system of flow separately.

في هذه الدراسة تم استحداث موديل جديد لحساب نسبة احتجاز السائل في جريان ثنائي الطور من نظام غاز- سائل بالجريان العمودي.هذا الموديل تم مقارنته مع تسعة طرق منشورة سابقا" باستخدام بيانات عملية لنظامين من الجريان منشورة مسبقا". المقارنة تمت باستخدام معامل الأداء (FPR) الذي يمثل نتيجة مكافئة لأغلب أدوات المقارنة الإحصائية مثل: نسبة الخطأ ، نسبة الخطأ النسبي ، الانحراف المعياري. النتائج بينت الأداء الأفضل للموديل الحالي بالمقارنة مع الطرق المنشورة الأخرى ولكل نظام جريان بصورة منفصلة.


Article
Experimental Study of Thermal Bubble Pump

Authors: Safaa H. Faisal --- Abdulwadood S. Shihab --- Saleh E. Najim
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2014 Volume: 14 Issue: 2 Pages: 77-90
Publisher: Basrah University جامعة البصرة

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Abstract

In this study, a numerical investigation hasbeen carried out for single phase flow behavior for thirty sixinternally finned tubes to demonstrate the effect of axial pitchto fin height ratio (p/e) for 0.8≤p/e≤6.345, helix angle ofinternal fins (β) for 30°≤β≤70°, apex angle of internal fins (α)for 0°≤α≤53.13°, internal fin height (e) for 0.6mm≤e≤1.0mm,internal tube diameter (di) with 14 mm and Reynolds number(Re) of single phase flow for 10000≤Re≤50000 on enhancementof forced convection heat transfer and reduction of frictionfactor by using ANSYS CFX program. It solves the threedimensionalNavier-Stokes equations for steady state turbulentwith SST model and enhance wall treatment. The numericalanalysis provided at fully developed velocity and temperature.Numerical results showed that the smallest axial pitch to finheight ratio (p/e) =0.8 and with apex angle α=10 degreeprovided enhancement of heat transfer of 2.8 to 3.55 timeshigher than of smooth tube. Finally, present numerical resultsare seen to be in good agreement with literature experimentalcorrelations.

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