Study On Particle Size Distribution And Transport Mechanism In Pipe Flow

The early establishment of China’s land-based oil fields have entered into high water cut stage.Which provides the conditions for the wide application of the normal temperature gathering and transportation technology.However,it is easy to appear that the mixing of pipe flow is not compatible in the gathering and transporting system of the multi-layer oil field.Which will lead to scaling in the pipeline,and affecting the normal production of oil fields.Therefore,the experimental simulation of the working conditions is the process of Ca²⁺and HCO3^-liquid to form CaCO3 crystallite.The change rule of the supersaturation and particle size distribution of particles is studied by experiment.Which will provide experimental and theoretical basis for studying the particle fouling and establishing the prediction model.Flow field and particle distribution in a cylindrical flat bottomed tank with a three blade propeller has been analyzed,basing on the FLUENT software.The results show that the particles distribute unevenly and deposit at the bottom of the tank.The conical bottom tank and the outer loop is used to solve those problems.The change rule of supersaturation has been studied by measuring the conductivity and pH of the solution.The particle size distribution is obtained by Malvin laser particle size analyzer.And the effects of stirring speed,initial solution concentration and solution temperature on particle size distribution are determined.Based on the results of particle size distribution,three kinds of transport mechanisms,such as diffusion,inertia and collision,exist in the pipe flow.And the collision mechanism plays a leading role.