Influence of the contact angle on two-phase flow in microreactors for nitrobenzene-hydrogen-stainless steel/carbon
| Autor: | Furkan Özkan, Kristin Hecht, Bettina Kraushaar-Czarnetzki, Klaus Schubert, Peter Pfeifer |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Microchannel Hydrogen Metallurgy Surface force Flow (psychology) chemistry.chemical_element Surfaces and Interfaces General Chemistry Mechanics Condensed Matter Physics Surfaces Coatings and Films Physics::Fluid Dynamics Contact angle Sessile drop technique chemistry Materials Chemistry Two-phase flow Microreactor |
| Zdroj: | Surface and Interface Analysis. 42:1122-1127 |
| ISSN: | 1096-9918 0142-2421 |
| DOI: | 10.1002/sia.3386 |
| Popis: | The contact angle of a gas-liquid-solid system plays a significant role in predicting flow patterns in microchannels for multiphase flows. The contact angle, which is a result of surface forces, is strongly influenced by the channel material. In the present study, we describe contact angle measurements and simulations of flow in a microchannel for the multiphase system hydrogen and nitrobenzene. Contact angles for nitrobenzene-hydrogen-stainless steel and nitrobenzene-hydrogen-carbon systems were measured using the sessile drop method at various pressures. Simulation of the two-phase system was performed using ANSYS FLUENT. The static contact angle is used as a boundary condition. The results from simulation of flow for a wide range of contact angles and the measured contact angles are presented. Experimental observations and simulation results agree in that the contact angle must be smaller 90° to obtain small bubbles and to increase the gas-liquid interfacial surface area. |
| Databáze: | OpenAIRE |
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