M.Sc.

FRICTION REDUCTION CAUSED BY THE ADDITION OF ADDITIVES INTO A TURBUIENT FLOW

Carboxy methyl cellulose, two anionic surfactants, Sodium stearate,Sodium lauryl sulfate and suspended clay as drag reducers have been investigated in this work, to reduce the frictional resistance and to save pumping power for turbulent pipe flow. The turbulent mode was produced via a positive displacement gear pump to avoid mechanical degradation of additives chains during the experimental period.

English

DETERMINATION OF FLOW REGIMES IN BUBBLE COLUMNS USING CFD

Computational fluid dynamics (CFD) simulation, deals with the solution of fluid dynamic equations on digital computers, requiring relatively few restrictive assumptions and thus giving a complete description of the hydrodynamics of bubble columns. This detailed predicted flow field gives an accurate insight to the fluid behaviors.3D simulation computational fluid dynamics (CFD) is applied using ANSYS-CFX Euler-Euler model to measure the hydrodynamic of an airlift reactor, and comparing with experimental data of Baten et. al., (1999).

English