The Abrasive Slurry Jet is transported into the nozzle through the slurry pump to form a jet, and the velocity of the nozzle outlet has a great effect on the processing efficiency. It is found that the surface texture plays an important role in improving the fluid motion state. Thus, a bionic nozzle can be created by introducing a micro-texture into the inner wall of the nozzle. The bionic nozzle introduces the inner wall of the nozzle into the micro-textured surface, so that the inner wall forms a low-speed water film, which transforms the direct contact between the slurry and the wall into the friction between the water and the water film near the inner wall. This effectively reduces the contact area between the fluid and the inner wall of the nozzle, significantly reduces the friction loss of the jet on the inner wall of the nozzle, and forms a higher-speed jet, thereby improving the dynamic efficiency and processing efficiency of the jet. By exploring the effects of different inner wall texture shapes, sizes and directions on the slurry flow characteristics at the inner wall of the nozzle in the slurry jet, the work aims to obtain a better micro-texture structure, so as to provide theoretical support for optimizing the nozzle structure and improving the processing efficiency. Specifically, surface micro-textures of different shapes, sizes and directions were designed on the inner surface of the nozzle, and the effects of different micro-textures on the slurry nozzle and particle velocity were investigated by theoretical analysis and finite element simulation. It was found from the velocity cloud diagram that the flow velocity of the slurry in the non-textured nozzle was 62.67 m/s, while the flow velocity of the nozzle with rectangular, triangular and arc textures increased to 62.95, 63.24 and 65.37 m/s, respectively. The slurry flow rate on the inner surface of the micro-textured nozzle was greater than that on the inner surface of the non-textured nozzle. Compared with stable triangles and regular rectangles, smooth arcs showed more obvious drag reduction and large and wide high-speed slurry channels in different shapes of micro-texture. For the inner wall of the nozzle, it is better to determine the curved micro-texture, and further explore the curved micro-texture size. It is found that the vortex formed by the smaller structure size is not obvious and the speed increase effect is not good, while the moderate texture size can achieve the effect of reducing drag more effectively. At this time, the slurry flow rate can reach 71.3 m/s and the particle velocity at the nozzle outlet can reach 70.83 m/s. In addition, it is found that under the same conditions, the micro-texture direction also has a certain effect on the slurry jet. When the micro-texture direction axis is convex, the vortex is uniform, which has obvious benefit to the slurry growth rate. On the contrary, the generation of vortices will cause fluid instability and the drag reduction effect is not good. In general, it is found that the presence of micro-texture on the inner wall of the nozzle can reduce the resistance of slurry flow and increase the flow rate of slurry. The smooth arc has the most significant effect on the gain of the slurry flowing through the inner wall of the nozzle, and the moderate micro-texture size has the better effect on the vortex growth. At the same time, more uniform vortices can be produced when the micro-texture is convex in the axial line. Therefore, the design of micro-texture surface on the inner wall of the nozzle with certain shape, size and direction is conducive to improving the slurry jet flow rate, reducing the abrasive embedding and adhesion probability of the nozzle inner wall, and improving the service time of nozzle.
Key words
slurry jet /
nozzle /
near-wall flow /
micro-texture /
slurry velocity /
drag reduction effect
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Funding
National Natural Science Foundation of China (52405445, 52375227); The Natural Science Research Fund of Higher Education of Anhui Province (2023AH050913); The Introduction of Talent Research Start-up Fund of Anhui Polytechnic University (2023YQQ004); The Anhui Provincial Key Research and Development Plan (2023t07020014)
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