PSI - Issue 77

Nikola Čajová Kantová et al. / Procedia Structural Integrity 77 (2026) 170 – 176 Čajová Kantová et al./ Stru c tural Integrity Procedia 00 (2026) 000 – 000

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2. Methodology of research The electrostatic model was created in the program Ansys Fluent and modelled through CFD simulations. The ordinary tubular separator was expanded to 4-tubular. Except it, a screw construction was inserted in this 4-tubular separator to direct the flow of flue gases. The model containing the screw construction is shown in Fig. 1. The tube with a diameter of 200 mm was expanded to 300 mm. Subsequently, 4 smaller tubes, each with a diameter of 120 mm, were inserted into the 300 mm tube. The flue gases entered the tube from the side, then passed through a T-piece, through an expansion, through 4 smaller tubes and finally through a narrowing to a diameter of 200 mm. When inserting the screw structure into the T-piece, it was assumed that the flue gas flow would be directed after passing through this structure. To ensure the structural integrity of the modified geometry, the design of the inserted screw construction and the 4-tubular assembly should be carefully adapted during operation to withstand the expected mechanical and thermal loads.

Fig. 1. The model of 4-tubular separator with the inserted screw construction for flow direction.

Fig. 2 shows the created mesh of this model. The dominant shape of mesh was tetrahedron. The number of elements for 4-tubular separator was 209887, for this separator with the inserted screw construction 375175 elements. Average value of the orthogonal quality for 4-tubular separator was 0.794, for this separator with the inserted screw construction 0.770. Average value of the skewness for 4-tubular separator was 0.204, for this separator with the inserted screw construction 0.228. The mesh quality was deemed satisfactory in relation to established criteria for both models.