Method for measuring bubble size under low-light conditions for mass transfer enhancement in industrial-scale systems

Yup Yoo, Seongbin Ga, Junghwan Kim, Hyungtae Cho

Research output: Contribution to journalArticlepeer-review


Shadowgraphy-based image processing studied in the literature on multiphase processes has led to meaningful advances in mass transfer enhancement via interfacial area enlargement. However, the industrial applications of shadowgraphy have been limited due to the requirement of an additional light source at specific locations. To overcome this limitation, in this study, a new bubble size measurement technique in low-light conditions is proposed. The technique uses reflected LED image on the bubble surface to estimate the bubble size in low-light conditions and includes a newly derived measurement correlation model, which was validated with lab-scale experimental data. Furthermore, the proposed model was applied to industrial-scale bubble systems for hydrogen fluoride (HF) removal. Using the bubble properties identified through analysis, the overall mass transfer coefficient (OMTC) was determined as an indicator of HF mass transfer enhancement. The optimal conditions for HF mass transfer were determined by identifying the system with the highest OMTC. By manipulating the pressure difference and flow rate, OMTC was increased by ∼78% of the base case.

Original languageEnglish
Article number106525
JournalInternational Communications in Heat and Mass Transfer
Publication statusPublished - 2023 Jan

Bibliographical note

Funding Information:
This work was supported by the Korean Institute of Industrial Technology within the framework of the project “Development and application of AI based microbubble-scrubber system for simultaneous removal of air pollutants [grant number KM-22-0015 ].”

Publisher Copyright:
© 2022 The Authors

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Chemical Engineering(all)
  • Condensed Matter Physics


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