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The behavior of hydrogen bubble flow in the MHD channel composed of platinum electrode.

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Title: The behavior of hydrogen bubble flow in the MHD channel composed of platinum electrode.
Authors: Li, Yan-Hom1 (AUTHOR) athomeli@ccit.ndu.edu.tw, Lin, Yi-Pin1 (AUTHOR)
Source: International Journal of Hydrogen Energy. Jan2025, Vol. 99, p494-503. 10p.
Subjects: Platinum electrodes, Laminar flow, Transition flow, Lorentz force, Reynolds number
Abstract: This study determines the behavior of hydrogen bubbles in a magnetohydrodynamic (MHD) channel that is equipped with platinum electrodes. The experiment analyzes the effects of varying inter-electrode distances (10 mm, 15 mm, and 20 mm) and different electrical current intensities (0.2A–3A) on bubble flow patterns within the channel. The flow transitions through laminar, transitional, and breaking down regions are affected by the Lorentz force. The results show that narrower electrode spacing promotes laminar flow, while wider spacing induces turbulence. Optimal hydrogen collection is obtained if the Lorentz force Reynolds number (Re L) is between 900 and 1300. The maximum Faradaic Efficiency (FE) occurs at 0.2A for all MHD configurations, with a value of 13.7% at 15 mm inter-electrode distance, but decreases at higher currents when an excessive number of bubbles accumulate and resistance increases. These results show that current intensity and electrode spacing must be optimized to ensure efficient hydrogen production and purity. • Narrow electrode gaps stabilize laminar flow; wider gaps increase bubble mixing. • The Lorentz force enhances bubble detachment and alters flow dynamics. • Optimal hydrogen purity occurs at Reynolds number (Re L) between 900 and 1300. • Faradaic efficiency peaks at 13.7% at 0.2A with 15 mm electrode spacing. • Balance electrode spacing and current for production efficiency and purity. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This study determines the behavior of hydrogen bubbles in a magnetohydrodynamic (MHD) channel that is equipped with platinum electrodes. The experiment analyzes the effects of varying inter-electrode distances (10 mm, 15 mm, and 20 mm) and different electrical current intensities (0.2A–3A) on bubble flow patterns within the channel. The flow transitions through laminar, transitional, and breaking down regions are affected by the Lorentz force. The results show that narrower electrode spacing promotes laminar flow, while wider spacing induces turbulence. Optimal hydrogen collection is obtained if the Lorentz force Reynolds number (Re L) is between 900 and 1300. The maximum Faradaic Efficiency (FE) occurs at 0.2A for all MHD configurations, with a value of 13.7% at 15 mm inter-electrode distance, but decreases at higher currents when an excessive number of bubbles accumulate and resistance increases. These results show that current intensity and electrode spacing must be optimized to ensure efficient hydrogen production and purity. • Narrow electrode gaps stabilize laminar flow; wider gaps increase bubble mixing. • The Lorentz force enhances bubble detachment and alters flow dynamics. • Optimal hydrogen purity occurs at Reynolds number (Re L) between 900 and 1300. • Faradaic efficiency peaks at 13.7% at 0.2A with 15 mm electrode spacing. • Balance electrode spacing and current for production efficiency and purity. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2024.12.224