Simulation and experiment of pressure drop in tube-wound fixed-bed reactor
The physical model of the particle bed was established based on a tube-wound fixed-bed reactor filled with particles of different shapes,and the effects of particle shape and structural parameters of the twisted tube on the bed void fraction and fluid distribution were investigated by means of CFD-DEM coupled simulation.The pressure drop in single-phase flow with high Reynolds number was measured accurately using the experimental bench of the tube-wound fixed-bed reactor.The results show that the smaller the twisted tube pitch and layer spacing,the larger the bed void ratio,and the change of tube diameter has almost no effect on the void ratio.The difference in the flow field distribution of the bed of spherical particles is large,and the uniformity of the fluid distribution in the bed of cylindrical and prismatic particles improves in turn.The CFD-DEM coupled simulation results of spherical particles are in good agreement with the experimental results,but the non-spherical particles have some errors with the experimental results.Various pressure drop prediction formulas are compared,and in order to accurately predict the pressure drop,the coefficients of the commonly used Ergun's formula and Nemec-Levec's formula are corrected according to the experimental results.The results of the study can provide a reference for the design and pressure drop prediction of tube-wound fixed-bed reactors.
tube-wound fixed-bed reactorpacked bedvoid fractionnumerical simulationpressure drop
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