Mass and heat transfer at spiral tube internal used as a heat exchanger and catalyst support in a continuous bubble column reactor.
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| Title: | Mass and heat transfer at spiral tube internal used as a heat exchanger and catalyst support in a continuous bubble column reactor. |
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| Authors: | El-Naggar, Mohamed A.1,2 (AUTHOR), Abdel-Gawad, Esraa H.3 (AUTHOR), Saleh, Ibrahim H.3 (AUTHOR), Sedahmed, Gomaa H.1 (AUTHOR), Attar, Alaa4 (AUTHOR), Abdel-Aziz, Mohamed Helmy1,5 (AUTHOR) mhmousa@alexu.edu.eg, El-Ashtoukhy, El-Sayed Z.1 (AUTHOR), Almutlaq, Nasser6 (AUTHOR), Fathalla, Ahmed S.1 (AUTHOR) |
| Source: | Experimental Heat Transfer. 2026, Vol. 39 Issue 1, p43-70. 28p. |
| Subjects: | Mass transfer, Bubble column reactors, Heat transfer, Heat exchangers, Catalyst supports |
| Abstract: | Slurry bubble columns find extensive applications in three-phase reactions, including biological wastewater treatment, fermentation, and hydrotreating, among others. Despite their merits, these reactors suffer from drawbacks such as high back mixing and challenges in product-catalyst separation. This study introduces a novel approach to address these issues by employing a horizontally placed spiral tube within the column, serving as both a catalyst support and a heat exchanger. The study investigates the impact of two-phase flow on mass transfer at the outer surface of the spiral tube using the limiting current based electrochemical technique. The experimental setup involves varying spiral tube diameter and pitch, as well as distances between successive spiral tubes. The results showed that the mass transfer coefficient increases with increasing superficial gas and solution velocities but decreases with increasing spiral tube diameter and pitch. An array of three separated horizontal spiral tubes was also tested, and the mass transfer coefficient was found to be slightly lower than that of a single spiral tube by an amount ranged from 4 to 19%. The study provides valuable insights into optimizing reactor design for improved efficiency, offering a potential solution to challenges in slurry bubble column reactors. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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