Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns

Xiong Yu; Han Zhou; Qiang Zheng; Shan Jing; Wenjie Lan; Shaowei Li

doi:10.1016/j.cjche.2020.03.024

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Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns

Fluid Dynamics and Transport Phenomena | Updated：2026-01-06

- Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns
- Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns
- 中国化学工程学报（英文版） 2020年第6期页码：1504-1513
- Affiliations：
  
  1. Institute of Nuclear and New Energy Technology, Tsinghua University,Beijing,China,100084
  2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum(Beijing),Beijing,China,102249
  3. State Key Laboratory of Chemical Engineering, Tsinghua University,Beijing,China,100084
- Author bio：
- Funds：
  
  We gratefully acknowledge the support of the National Natural Science Foundation of China(21776151 and 21576147) for this investigation.
- DOI：10.1016/j.cjche.2020.03.024
  中图分类号：
- 纸质出版：2020
- Accepted：
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Xiong Yu, Han Zhou, Qiang Zheng, 等. Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns[J]. 中国化学工程学报（英文版）, 2020,(6):1504-1513.

Xiong Yu, Han Zhou, Qiang Zheng, et al. Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns[J]. Chinese Journal of Chemical Engineering, 2020, (6): 1504-1513.
Xiong Yu, Han Zhou, Qiang Zheng, 等. Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns[J]. 中国化学工程学报（英文版）, 2020,(6):1504-1513. DOI： 10.1016/j.cjche.2020.03.024.

Xiong Yu, Han Zhou, Qiang Zheng, et al. Determining axial dispersion coefficients of pilot-scale annular pulsed disc and doughnut columns[J]. Chinese Journal of Chemical Engineering, 2020, (6): 1504-1513. DOI： 10.1016/j.cjche.2020.03.024.

摘要

Abstract

In this study

a computational fluid dynamics (CFD) method was adopted to calculate axial dispersion coefficients of annular pulsed disc and doughnut columns (APDDCs). Passive tracer was uniformly injected by pulse input at the continuous phase inlet

and its concentration governing equation was solved in liquid-liquidtwo-phase flow fields. The residence time distributions (RTDs) were obtained using the surface monitoring technique. The adopted RTD-CFD method was verified by comparing the axial dispersion coefficient between simulation and experimental results in the literature. However

in pilot-scale APDDCs

the axial dispersion coefficients predicted by the CFD-RTD method were approximately three times larger than experimental results determined by the steady-state concentration profile method. This experimental method was demonstrated to be insensitive to the variation of the axial dispersion coefficient. The CFD-RTD method was more recommended to determine the axial dispersion coefficient. It was found that the axial dispersion coefficient increased with an increase in pulsation intensity

column diameter

and plate spacing

but was little affected by the throughput.

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