Comprehensive experimental and theoretical investigations on the effect of microbubble two-phase flow on the performance of direct-contact membrane distillation
- Authors
- Kim, Yu-Bin; Lee, Ho-Saeng; Gil, Geon-Woo; Ji, Ho; Kim, Young-Deuk
- Issue Date
- Feb-2023
- Publisher
- Elsevier BV
- Keywords
- Membrane distillation; Microbubble generator; Permeation flux enhancement; Two-phase flow; Seawater desalination
- Citation
- Water Research, v.229, pp 1 - 14
- Pages
- 14
- Indexed
- SCIE
SCOPUS
- Journal Title
- Water Research
- Volume
- 229
- Start Page
- 1
- End Page
- 14
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/111651
- DOI
- 10.1016/j.watres.2022.119407
- ISSN
- 0043-1354
- Abstract
- This study provides a comprehensive and systematic overview of the application of gas-liquid two-phase flow with microbubbles in the feed stream to improve heat and mass transfer in direct-contact membrane distillation (DCMD) processes for seawater desalination. A swirl-flow-type microbubble generator (MBG) was installed at the feed-side inlet of the DCMD module to investigate its effect on transmembrane flux. The maximum improvement in the MBG-assisted DCMD permeation flux was found to be approximately 18% at a lower feed temperature (40 degrees C) and optimal air flow rate (50 cc/min), and an optimal MBG geometry comprising a swirler, a nozzle tip of diameter 2 mm, and a diffuser at an angle of 30 degrees. The results were observed to be related to the number density of microbubbles less than 100 mu m in size, which plays an important role in improving heat and mass transfer in two-phase flow. In addition, the simulation results based on conventional heat transfer correlations of bubbly flow underestimated the experimental results. Therefore, this study also aims to propose and verify a new two-phase flow heat transfer correlation. The proposed correlation considers the effects of bubble size distribution to accurately predict the performance of MBG-assisted DCMD processes.
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