| Title: | A simple multiple flow regime modeling approach of induced flow in external loop airlift reactors |
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| Authors: | ID Zupan, Bor (Author)
ID Perpar, Matjaž (Author)
ID Gregorc, Jurij (Author)
ID Šarler, Božidar (Author) |
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| Files: |  PDF - Presentation file, download (4,69 MB)
MD5: 954884B3389C192E5185C09416FCB266
 URL - Source URL, visit https://www.sciencedirect.com/science/article/pii/S1359431125010026
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IMT - Institute of Metals and Technology
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| Abstract: | Accurate treatment of heat and mass transfer processes inside airlift reactors requires accurate velocity field information. This study presents a novel one-dimensional model forecasting induced liquid flow within an external loop airlift reactor across diverse flow regimes. The approach is grounded on homogeneous flow assumption, augmented by a novel correction term derived through modeling of turbulence-induced pressure losses behind gas structures, employing the separated flow model (Lockhart-Martinelli). The model was assessed by comparing the results with purpose-provided experimental data utilizing air and demineralized water. The gas and liquid superficial velocities ranged from 0.001-0.6 m/s and 0.2–1.1 m/s, respectively. Within ± 10 %, an agreement between the novel model and experimental data was observed for both bubbly, separated, and in- termediate flow regimes. A similarly robust agreement was confirmed through comparisons with five published experimental datasets. The distinctive feature of this model is its ability to accommodate multiple flow regimes in a unified manner. It circumvents the necessity for specific regime modeling by introducing a correction term with a complexity marginally surpassing that of the conventional homogeneous flow approach. Beyond its primary application in airlift reactors, the model provides a unified framework for modeling two-phase flow hydrody- namics in thermal applications, particularly in flow boiling and bubble-induced convective heat transfer systems. The model’s simple yet effective structure also allows for integration into higher-fidelity heat transfer simula- tions, making it valuable for boiling heat transfer studies, enhanced cooling strategies, and industrial multiphase flow applications. |
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| Keywords: | airlift reactor, homogeneous flow, separated flow, theoretical model, induced flow |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.08.2025 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2025 |
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| Number of pages: | str. 1-13 |
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| Numbering: | Vol. 272, [article no.] 126410 |
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| Source: | Applied Thermal Engineering |
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| PID: | 20.500.12556/DiRROS-22241  |
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| UDC: | 544.014:621 |
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| ISSN on article: | 1873-5606 |
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| DOI: | 10.1016/j.applthermaleng.2025.126410 |
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| COBISS.SI-ID: | 232260867 |
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| Copyright: | © 2025 The Author(s). Published by Elsevier Ltd. |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 11. 4. 2025;
Matjaž Perpar, Jurij Gregorc, Božidar Šarler;
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| Publication date in DiRROS: | 13.05.2025 |
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| Views: | 563 |
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| Downloads: | 283 |
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