Local flow direction measurements using tri-segmented microelectrode in packed beds

Micro-electrodes with exposed areas ranging from 5-30 mm 2 were placed onto 4.5 mm alumina spheres and used for the sub-particle scale quantification of liquid-solid mass transfer. A novel electrochemical technique was applied where the external cathode wetting fraction and liquid-solid mass transfer were simultaneously quantified. Clear bifurcation of the area-specific liquid-solid mass transfer was observed, providing direct evidence of the two-wetted-zone theory previously inferred from tracer response analysis. The lower hysteresis branch (Levec prewetting) exhibited larger fractions of static wetted area compared to the upper branch (Kan prewetting). The static zones were not completely stagnant and the average static mass transfer rate increased with liquid superficial velocity. The spatial position of the static zones varied for a given packing configuration, while no relationship was found between the positioning of static and residual holdup. Static liquidsolid mass transfer coefficients were found to be higher than those obtained from tracer response analyses on porous particles.

show abstract

Modelling and measurements of the velocity gradient and local flow direction at the pore scale of a packed bed

Dumas

Lesage

Latifi

2010

Chemical Engineering Research and Design

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

Local flow direction measurements using tri-segmented microelectrode in packed beds

Cited by 6 publications

References 11 publications

Synchronized analysis of an unsteady laminar flow downstream of a circular cylinder centred between two parallel walls using PIV and mass transfer probes

Synchronized analysis of an unsteady laminar flow downstream of a circular cylinder centred between two parallel walls using PIV and mass transfer probes

Liquid–solid mass transfer distributions in trickle bed reactors

Modelling and measurements of the velocity gradient and local flow direction at the pore scale of a packed bed

Contact Info

Product

Resources

About