İKİ BORU ARASINDAKİ KATI MADDE TAŞINIMININ HESAPLAMALI AKIŞKANLAR DİNAMİĞİ İLE MODELLENMESİ

Determination of the pressure loss with a sufficient accuracy for sediment transport in annulus is 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 is capable of estimating frictional pressure drop.