Publication detail

Analysis of Droplet Motion in Cavity Zone of Rotating Packed Bed

HÁJEK, O. MALÝ, M. CEJPEK, O. BLATKIEWICZ, M. JEDELSKÝ, J. HÁJEK, J. MAJDZIK, M. JASKULSKI, M. JÍCHA, M.

Original Title

Analysis of Droplet Motion in Cavity Zone of Rotating Packed Bed

Type

journal article in Web of Science

Language

English

Original Abstract

Droplet motion in outer cavity zone of rotating packed bed is a complex phenomenon that requires analysis of liquid and gas flow to clarify influences of factors such as rotation speed, liquid flow rate, or gas flow rate. In this study, hydrodynamics is described using laser Doppler velocimetry and high-resolution visualization for droplet motion characterization. The results reveal that droplet motion initially depends on the peripheral velocity of the packing, while further from the packing, it loses kinetic energy mainly due to the drag force caused by the surrounding gas. Two-way coupling is investigated as both phases interact with each other. Rankine vortex theory is applied to simulate gas flow in the outer cavity zone. A model, based on Newton's second law, is developed to predict droplet dynamics, including impingement velocity, trajectory length, and total residence time. Validation of the model shows that it can predict the liquid velocity in the outer cavity zone accurately. Upon impingement of droplets on the casing, part of the liquid rebounds as secondary droplets into the cavity, where they circulate with the gas flow. Overall, this study provides insights into droplet dynamics in the rotating packed bed and offers a basis for optimizing process efficiency and design in various applications, including chemical processing and environmental engineering.

Keywords

Rotating packed bed, high-resolution visualisation, laser Doppler velocimetry, hydrodynamics, two-phase flow

Authors

HÁJEK, O.; MALÝ, M.; CEJPEK, O.; BLATKIEWICZ, M.; JEDELSKÝ, J.; HÁJEK, J.; MAJDZIK, M.; JASKULSKI, M.; JÍCHA, M.

Released

1. 5. 2025

Publisher

ELSEVIER

Location

AMSTERDAM

ISBN

1873-3794

Periodical

SEPARATION AND PURIFICATION TECHNOLOGY

Year of study

357

Number

B

State

Kingdom of the Netherlands

Pages count

12

URL

https://www.sciencedirect.com/science/article/pii/S1383586624038140

BibTex

@article{BUT189793,
  author="Ondřej {Hájek} and Milan {Malý} and Ondřej {Cejpek} and Michal {Blatkiewicz} and Jan {Jedelský} and Jiří {Hájek} and Małgorzata {Majdzik} and Maciej {Jaskulski} and Miroslav {Jícha}",
  title="Analysis of Droplet Motion in Cavity Zone of Rotating Packed Bed",
  journal="SEPARATION AND PURIFICATION TECHNOLOGY",
  year="2025",
  volume="357",
  number="B",
  pages="12",
  doi="10.1016/j.seppur.2024.130075",
  issn="1873-3794",
  url="https://www.sciencedirect.com/science/article/pii/S1383586624038140"
}