Hydrodynamic behavior of a bubble column with Venturi-Type gas Distributors: Gas holdup and bubble properties.
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| Title: | Hydrodynamic behavior of a bubble column with Venturi-Type gas Distributors: Gas holdup and bubble properties. |
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| Authors: | Chang, Ye Ji1 (AUTHOR), Son, Haeun1 (AUTHOR), Kim, Suyoung2 (AUTHOR), Kim, Sung Won1,2 (AUTHOR) kswcfb@ut.ac.kr |
| Source: | Journal of Industrial & Engineering Chemistry. Jun2026, Vol. 158, p799-808. 10p. |
| Subjects: | Bubble column reactors, Bubble dynamics, Hydrodynamics, Heat transfer, Fluid dynamics |
| Abstract: | [Display omitted] • A Venturi bubble generator distributor was first proposed for bubble columns. • Throat diameter of 3 mm & diverging angle of 32.5° are optimal geometric parameters. • The optimal operating range was identified at gas-to-liquid ratio of 2.0 – 6.5. • A distributor with two VBGs was the most effective configuration for bubble column. Venturi-type bubble generators (VBGs) as gas distributors were evaluated for gas holdup (ε g) and the bubble properties governing heat and mass transfer in bubble columns. Experiments with a bubble column (0.15 m I.D. × 2.00 m high) were conducted to determine the optimal VBG geometry, gas–liquid loading ratio (m th), and distributor configuration under forced gas supply. Decreasing the throat diameter (D th = 3–5 mm) enhanced the Venturi effect, resulting in higher ε g and lower relative standard deviation (RSD) of pressure fluctuations with formation of smaller bubbles. A D th of 3 mm exhibited a low and narrow power spectral density and high average frequency (f avg) corresponding to a uniform distribution of fine bubbles. Diverging angle variation (β = 15–42.5°) revealed that maximum ε g and f avg at 32.5°. Under the optimal geometry (D th of 3 mm and β = 32.5°), the optimal m th was identified as 2.0–6.5. Multiple VBGs tests demonstrated that increasing VBG number reduced bubble-free regions, but caused bubble-stream interference. A distributor with two VBGs exhibited higher ε g by a factor of 1.33 compared to a single VBG while maintaining stable operation with small bubble sizes, identifying the most effective configuration for VBG-based bubble columns. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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