Numerical simulation research on suction process of concrete pumping system based on CFD method

Abstract

In this paper, a numerical model of the suction process of the pumping system was established, and the accuracy of the numerical model was verified by the rheological experiment of fresh concrete and the suction experiment of the pumping system. By analyzing the numerical results, the distribution characteristics of the internal flow field of the hopper and the change law of the bubble shape in the fresh concrete during the suction process were explored. The results show that the established numerical model can effectively simulate the material suction process of the pumping system, and the flow velocity of the fresh concrete in the mixing area presents a periodic variation behavior. The simulation results show that there is a “flow dead zone” at the bottom of the hopper. Smaller flow speed of fresh concrete was found around the S valve, and the bubbles located inside the fresh concrete have a negative impact on the suction effect of the pumping system. The research results of this paper provide valuable references for designers to improve the hopper structure and optimize the operational parameter of the suction process of pumping system. Distribution characteristics of the internal flow field of the hopper in the suction process. • The model of suction process was established by the CFD method. • Flow velocity of concrete in hopper presents the law of periodic variation. • Flow velocity of concrete decreases when it flows through the S valve. • Air bubbles gather at the end face of the piston at the end of the suction.