İKİ BORU ARASINDAKİ KATI MADDE TAŞINIMININ HESAPLAMALI AKIŞKANLAR DİNAMİĞİ İLE MODELLENMESİ

İki boru arasındaki katı madde (sediment) taşınımında basınç farkının yeterli bir doğrulukta belirlenmesi, uygun pompa seçiminde en fazla dikkat edilmesi gereken konulardan birisidir. Katı madde sisteme girdiğinde, basınç farkı artmaktadır. Ayrıca, katı - sıvı çift fazlı sistemde içteki borunun dönmesi akış alanındaki artma nedeniyle basınç farkını azaltmaktadır. Sistemin karmaşıklığı nedeniyle, basınç farkının doğru tahmini tek fazlı akışa göre daha zordur. Bu çalışmada, farklı debi, boru dönme ve delme hızları için geniş kapsamlı bir deneysel çalışma gerçekleştirilmiştir. Deneylerden elde edilen sonuçlar, içteki borunun dönmesinin sediment taşınımını kolaylaştırdığı ve sedimetlerin taşınımı için gerekli olan kritik akış hızını ve basınç gradyanını düşürdüğünü göstermiştir. İki boru arasındaki sediment taşınımı Hesaplamalı Akışkanlar Dinamiği (HAD) kullanılarak modellenmiştir. Diğer parametrelerin yanında basıç farkları da kaydedilmiştir. HAD modelini doğrulamak için basınç farkları deneysel verilerle kıyaslanmıştır. Sonuçlar, HAD modelin basınç farkını yeterli doğrulukta tahmin edebildiğini göstermiştir

Anahtar Kelimeler:

Basınç farkı, HAD, İki boru arası akış, Sıvı-katı akışı

CFD MODELLING OF SEDIMENT TRANSPORT IN ANNULUS

Determination of the pressure loss with a sufficient accuracy for sediment transport in annulusis one of the major concerns while proper pump systems selections. When the solid particle is present in the annulus, frictional pressure loss increases. Moreover, rotating inner pipe in solid-liquid system decreases pressure losses due to increase of the free flow area in annulus. Because of the complexity of this system, accurate prediction of frictional pressure loss is more difficult than single flow. The result showed that inner pipe rotation in an annulus ease the sediment transport and decrease pressure gradient and critical velocity that is necessary to initiate sediment movement. In this study, sediment transport in annulus has been modelled using Computational Fluid Dynamics (CFD). Extensive experimental study was conducted at a flow loop for various flow rates, pipe rotation speed, and rate of penetration. Pressure drop within the test section was recorded besides the other test parameters. To verify the CFD model, estimated frictional pressure losses are compared with experimental data. Results show that CFD model iscapable of estimating frictional pressure drop

Keywords:

Pressure loss, CFD, Flow in annulus, liquid-solid flow,

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