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STUD Y OF AIR -WATER FLOW INSIDE A 3-D CROSS JUNCTION
دراسة جريان المياه في العقد الثلاثية

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Abstract

ABSTRACTThis study examines the flow of water and air in a cross junction by fluent underAnsys 12. Initially the problem will solve by using the less computationally intensivemixture model, and then turn to the more accurate Eulerian model. In this study whichis using flow of water and air inside closed and vertical conduit as cross junction sothe flow is water and air as mixture in inlet of pipe and the mixture leaves the pipe inthree outlets as shown in Figure (1), also the phase of the air is assume to be bubbleflow, so the diameter of the bubble of air will be present. The slip velocity equationneed to solve since there will be significant difference in velocities for the differentphases. The study used solid work programme to work the figure and then export it tofluent of Ansys. The study used the mixture model and Eulerian model to investigatethe distribution of air inside the cross pipe and the where of the effect of staticpressure inside the cross conduit for design. Also the contour of velocity magnitude isused to know the moving and distribution of the flow. The comparison between thetwo model are happen to know the range of converge for results for two model

اهذا البحث اختبر جريان الماء والهواء في توصيلة متعددة. في البداية سوف تحل المسالة بواسطة موديلالمزيج الأقل حسابات ومن ثم استخدام موديل اؤيلر الأكثر دقة في هذه الد ا رسة والتي استخدمت جريان الماءوالهواء في داخل قناة مغلقة عمودية كتوصيلة متقاطعة لذا فان الجريان المستخدم هو الماء والهواء كخليط فيمدخل الأنبوب حيث يغادر الخليط الأنبوب في ثلاثة مخارج كذلك الطور للهواء سوف يفرض بان يكون علىشكل فقاعات لذا فان قطر الفقاعة سوف يتم استخدامه. سرع الانزلاق سوف تحل في موديل المزيج بسبب وجودلغرض رسم الشكل ومن ثم أرسالة إلى solid work اختلاف في السرعة للطورين. الد ا رسة استخدمت برنامجالد ا رسة استخدمت موديل المزيج وموديل اؤيلر لتخمين توزيع الهواء في داخل الأنبوب . Ansys برنامجالمتقاطع وكلك معرفة مكان تأثير الضغط الساكن في داخل القناة المتقاطعة لغرض التصميم. كلك تم رسممخطط كمية السرعة لعرفة حركة وتوزيع الجريان. المقارنة بين الطريقتين قد تمت لغرض معرفة مدى قربالنتائج لكلا الطريقتين.


Article
CFD Study of Cuttings Transport through Vertical Wellbore
دراسة حركيات المائع الحسابية لقطع الصخور المنتقلة خلال بئر عمودي

Authors: Mortatha Al-Yasiri --- Amthal Al-Gailani --- Dongsheng Wen
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2018 Issue: 20 Pages: 158-178
Publisher: Ministry of Oil وزارة النفط

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Abstract

Cuttings transportation from the bit up the annulus to the surface is one the essential functions that are performed by drilling fluid. Predication of drilling fluid efficiency to transport cuttings in the annulus is very complicated due to numerous parameters that have affected drilling operations. Computational Fluid Dynamics (CFD) is widely used as a numerical technique in handling complex multiphase flow problems in different operational conditions. The present work has taken the advancement of CFD to computationally analyse the influence of the effects of various parameters like drilling fluid rheology, flow rate, pipe rotation, cuttings density, shape, concentration and drilling fluid- cuttings particle coupling regimes on the cuttings transport in a vertical wellbore. The CFD simulation was carried out by using transient solver of ANSYS-FLUENT CFD commercial code. The dense discrete phase model (DDPM) is suggested in this work to overcome the main shortcomings of Eulerian–Eulerian and CFD-DEM approaches in simulating drilling fluid-cuttings flow. Also, some of the experimental investigations were involved in determining the fluid physical properties and essential input data to perform the CFD simulations. Regarding the results validation and verification, well agreement has been achieved between results obtained in this study with those reported in other studies.

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