To improve the efficiency of waste collection in recirculating aquaculture tanks (RATs), this study proposed a dual-channel RAT with flow-guide discs on the overflow pipe close to the bottom. First, an experimental verification system was designed, and the validity of the two-phase flow model was verified by comparing the experimental results. Then, the liquidsolid flow characteristics were analysed by comparing the velocity distribution, particle trajectory, retention time and removal rate. Finally, the influences of the parameters of the flow-guide discs on the particle agglomeration effect were obtained by comparing the discharge rate of particles under different hydraulic retention times (HRTs). The results indicate that the flow-guide disc weakens local reflux, reduces the overcurrent area and the low-speed vortex area at the bottom of the tank, and thus shortens the residence time for particulate matters. As the diameter of the flow-guide disc increases within a certain range, the flow velocity gradient and eddy intensity near the disc will increase, resulting in a shorter residence time for particles. Furthermore, as the height of the flow-guide disc to the bottom of the tank decreases, the flow velocity below it accelerates, which is beneficial for improving the discharge rate of particulate matter. However, when the height of the flow-guide disc increases to a certain extent, the influences on the hydrodynamics of waste collection become weaker.

为了提高循环水养殖池（RAT）废物收集的效率，本研究提出了一种在靠近底部的溢流管上带有导流盘的双通道RAT。首先设计了实验验证系统，通过实验结果对比验证了两相流模型的有效性。然后，通过比较速度分布、颗粒轨迹、保留时间和去除率来分析液固流动特性。最后，通过比较不同水力停留时间（HRT）下颗粒的排出量，得出导流盘参数对颗粒团聚效果的影响。结果表明，导流盘削弱了局部回流，减少了罐底的过流面积和低速涡流面积，从而缩短了颗粒物的停留时间。当导流盘直径在一定范围内增大时，导流盘附近的流速梯度和涡流强度增大，导致颗粒停留时间缩短。此外，随着导流盘距池底高度的降低，其下方的流速加快，有利于提高颗粒物的排放率。然而，当导流盘高度增加到一定程度时，对垃圾收集流体动力学的影响变弱。