Computational fluid dynamics and experimental validation of hydrodynamics of ripple tray

NaYang. RongyaZhang, BinJiang, ZhongtaoLia’ LuhongZhanga, YongliSuna

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

National Engineering Research Center for Distillation Technology, Tianjin University, Tianjin 300072, China

Tianjin Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China

Highlights

  • The hydrodynamics of ripple tray was studied through numerical simulation based on SST turbulence model.
  • Good agreement was found with minor error between predicted and experimental clear liquid height, dry/irrigated pressure drop.
  • Comparison was made with sieve tray and the advantages of ripple tray were well illustrated in the analysis of flow field.
  • Dual-diameter perforated ripple tray was also investigated and the result indicates that it performs better in terms of pressure drop and operational flexibility.

Abstract

In the present study, numerical simulations of liquid/gas flow behavior on ripple tray have been carried out, and an inhomogeneous Euler–Euler model coupled with the SST turbulence model has been applied. Calculations are carried out using the ANSYS CFX 12.0. Validation of the predictions of macroscopical parameters including clear liquid height, dry/irrigate pressure drop is made against the measurements. Detailed insights into the hydrodynamic behavior are obtained by CFD post-processing. Comparison with sieve tray is made and the advantages of ripple tray are well illustrated in the analysis of flow field. Dual-diameter perforated ripple tray is also investigated and the result indicates that it performs better in terms of pressure drop and operational flexibility.

Keywords

Ripple tray; Downcomer-less tray; CFD; Multiphase flow

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