Study on gas-solid two-phase flow characteristics in molding cavity of 3D printer based on Fluent

• 1、School of mechanical engineering, Liaoning University of Technology ,Fuxin,123000

Abstract：Based on Computational fluid dynamics.CFD) method is used to simulate the flow characteristics of gas-solid two-phase flow in the forming chamber of 3D printing equipment. A physical model is established by combining a small 3D printer. The reason for the large amount of smoke in the forming chamber of this 3D printing equipment is analyzed by using the method of solid particle track tracing, and the problems in the actual production process are explained. The machining level is changed by changing the distance between the blowing and suction holes.The height of the stage and the height of the suction holes are used to qualitatively analyze the influence of the two on the smoke generation in the chamber.The results show that the reason for the large amount of smoke inside the chamber during the actual processing is that the laminar gas diffuses seriously, which causes eddy current phenomenon inside the chamber and increases the retention time of small solid particles in the forming chamber. The suction hole height of the 3D printing equipment is calculated theoretically by the suction hood dust removal theory. The comprehensive analysis shows that the distance between the suction hole and the upper surface is 32 mm.When the suction hole height is 22mm, the smoke volume inside the chamber can be minimized.

Keywords： computational fluid dynamics gas-solid two-phase flow characteristics solid particle trajectory tracing suction hood dust removal theory