Analysis of drag reduction effect of vibration on elbow
Energy saving and drag reduction is an urgent problem to be solved in recent years,and the application of long-distance pipeline transportation system is particularly important.Different from the existing conveying medium,the vibration drag reduction technology was used in the gas-solid two-phase flow system of pneumatic conveying.The Euler-Euler two-fluid model and the single reference frame model controlled by user-defined function were used to numerically simulate the influence of different vibration parameters on drag reduction rate,and the changes of different flow rates and solid phase volume fraction were considered.The simulation results show that the shear stress decreases with the increase of amplitude and frequency,and the drag reduction rate increases with the increase of amplitude and frequency.When the vibration direction is along the x-axis,the drag reduction effect is the best,followed by the y-axis,and the z-axis is the worst.The pressure difference increases with the increase of the flow rate as a power exponential function,and the vibration does not change the trend of the pressure difference with the flow rate.The drag reduction rate decreases with the increase of the flow rate under the same vibration parameters.The pressure difference increases linearly with the increase of solid phase volume fraction,and vibration does not change the trend of pressure difference with the increase of solid phase volume fraction.The drag reduction rate decreases with the increase of solid phase volume fraction under the same vibration parameters.The conclusion can provide guidance for gas-solid two-phase drag reduction technology.
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