Fluid-structure coupling for particle deposition-resuspension predictions in tube bundle heat exchangers based on dynamic mesh method

This study focuses on the resuspension characteristics of particle deposition structures on the heat exchanger equipment. The changes in tube structure caused by particle adhesion deposition and intermittent shear resuspension are considered, and the particle-wall interactions and their impacts on thermal resistance are analyzed using fluid-structure coupling based on dynamic mesh technology. Through theoretical analysis and numerical simulation, a deposition prediction model is established, addressing the particle deposition characteristics, deposition morphology, and their impacts on the heat transfer performance. The findings reveals that the particle deposition fraction initially increases and subsequently decreases with the dimensionless relaxation time. As the particle deposition height increases, intermittent resuspension becomes dominant. According to deposition prediction model, Residual particle mass on tube bundle will converge to a certain value asymptotically rather than continuous growth as time. Thus, even under long-term operation, the impact of graphite dust deposition on the performance of heat exchangers is limited.