Numerical Simulation of Continuous Stirred-Tank Reactor Based on Lattice Boltzmann Method
In order to investigate the flow field characteristics of a continuous stirred-tank reactor(CSTR)under high solid food waste conditions,a novel computational fluid dynamics method,namely the Lattice Boltzmann Method(LBM),was proposed.The flow field characteristics of the three paddle types were simulated,and the credibility of the method was assessed by comparing the experimental and simulated values of torque at different rotational speeds.The results demonstrated that the relative deviations between the experimental and simulated values at low rotational speeds were less than 5% .Subsequently,the variations in speed distribution,torque,and dead zone percentage of different stirring paddles were examined.The simulation results indicated that the speed of the screw-type stirring paddle is capable of filling almost the entire reactor and exhibited a relatively low dead zone percentage when treating food waste with a 20% solids content.Subsequently,it is found that the dead zone in the reactor decreases as the speed of the screw-belt stirring paddle increases.Therefore,the optimum mixing condition for a continuous stirred-tank reactor(CSTR)for mixing food waste with a high solid content is a screw-belt stirring paddle with a rotational speed of 40 r/min.The lattice Boltzmann method approach proposed in this paper can be used to simulate the flow characteristics of high solid content food waste under low rotational speed conditions.
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维普
